Analyzing the Relationships between Citizens’ Emotions and their Momentary Satisfaction in Urban Public Spaces

It is recognized that the urban environment, and specifically better-experienced urban public space, contribute to people’s subjective well-being. However, research on people’s momentary subjective well-being (i.e., emotional state) in relation to the multiple aspects of urban public spaces is still limited. Therefore, the aim of this study was to analyze people’s emotional state and how this is influenced by the momentary satisfaction with urban public spaces, and also controlling for personal and experience characteristics. Data of 1056 momentary experiences of 161 citizens regarding the urban public space in Eindhoven, The Netherlands, were collected by means of an experience sampling method (ESM). These data were analyzed using a mixed multinomial logit (MMNL) model for each dimension of people’s momentary subjective well-being (i.e., sense of security, comfort, happiness, and annoyance). Results of this study showed that people were happier when they were satisfied with the atmosphere of the public space and felt more secure, comfortable, and less annoyed when they were more satisfied with traffic safety. Results could be used by policymakers and urban planners to create inclusive urban public spaces where people have more positive experiences, which eventually could lead to happier, comfortable, more secure and less annoyed citizens.


Introduction
It is expected that, in 2050, two thirds of the world's population will be living in cities [1]. It is recognized that features of a city influence how we experience the urban environment and consequently have an impact on our feelings or emotions [2]. Therefore, designing cities that are attractive and responsive to citizens' needs and demands and where people have more positive experiences has become increasingly important for policymakers, urban planners, managers and designers [3,4].
A vital asset of a city is its public spaces [5], which can be defined as "open spaces," which are indoor or outdoor spaces that are accessible to the public (e.g., streets, walkways, parks, public transportation facilities, public shopping facilities, and other spaces where people gather or pass through) [6][7][8]. It is recognized that a better-experienced urban public space (especially urban public spaces with natural elements) could have advantages for people's psychological and physical health, which eventually could contribute to their overall quality of life [1,9,10]. In contemporary cities, urban public spaces often offer insufficient facilities or are misused, and therefore face the risk of deterioration [11]. In cities that fail to tackle the rapid growth population rates and societal changes, the maintenance of urban public spaces becomes a public burden [12], which consequently could result in negatively experienced urban public spaces and eventually thus negative emotional outcomes.

Theoretical Framework
Tonnelat [8] described urban public spaces as spaces in the city that are accessible to the public, such as streets and parks, transportation facilities, or shopping facilities. These public spaces are important for providing opportunities for movement, communication, enjoyment, and relaxation [13]. Mehta [24] discussed five dimensions to evaluate a public space, namely, that a good public space is meaningful and supports different activities, it should be pleasurable, accessible to varying individuals and groups (i.e., inclusiveness), provide a sense of safety, and provide physical and environmental comfort. The evaluation of public spaces was further improved by Zamanifard et al. [7], who proposed the user-centered Public Space Experiential Quality Index (PSEQI) to measure comfort, inclusiveness, diversity and vitality, and image and likeability.
Understanding the emotional response to urban public space is important for the decision-making process when developing urban areas. It has been recognized for a long time that people's behavior (B) could be influenced by personal characteristics (P) as well as the environment (E) (i.e., B = f (P, E)) [25]. Furthermore, it is believed that spaces and places are interconnected with emotions, and every experience of a location can evoke an emotion [26]. Thus, when people interact with their environment at a certain moment, this could result in a momentary subjective experience, which evokes a momentary affect [27]. Affect could be described as an inclusive concept that refers to people's emotions [28]. For example, it is recognized, based on an extensive literature review, that physical activity in a natural environment leads to more positive emotions [29]. Other studies also showed that people are in a better mood and report lower levels of anxiety and stress after visiting a park [20]. Birenboim [22] defined four dimensions of people's momentary emotions, namely, sense of security, comfort, happiness, and annoyance. These emotional states (Table 1) are used, in this current study, to explain the relationships between the experience with regard to urban public spaces and people's emotional outcomes.

Happiness
Most studies that have analyzed emotions in relation to urban space focus on happiness, as this is an important element of people's (mental) health and well-being. For example, results of the study by Negami et al. [30] showed that spaces with green and which are colorful were related to higher levels of happiness. Also, the architecture of the urban space was found to have an effect on happiness [31]. Furthermore, air pollution was found to negatively influence feelings of happiness [32,33]. In addition, Sepe [34] defined principles of public spaces that are important for urban happiness. First, a public space should be multifunctional and have a good balance between nature and equipment (e.g., benches, playgrounds, and exercise equipment, etc.). Next, the public space should be clean and well maintained and people should feel safe (e.g., by means of artificial light in the evening) at these spaces. Furthermore, the smell of nature (e.g., grass, wood, or sea) is important for people to feel happy at public spaces. Finally, noise by transportation should be minimized in public spaces to increase happiness.

Annoyance
Besides happiness, people could also feel annoyed as a reaction to their urban environment, which is mainly related to noise pollution [15]. Studies showed that living close and having access to green areas was related to lower levels of noise annoyance [35,36]. Another study by Gozalo, Morillas, and González [37] showed that noise is the most important indicator of being satisfied with a park and that noise from road traffic is more annoying in small parks. Also, for people who attend a park for tranquility, quietness is important [38]. In addition, smell also influences how people perceive places [19]. For example, a study showed that annoyance from (offensive) smells was related to low residential satisfaction [39].

Sense of Security
Another important dimension of momentary SWB, in relation to the urban environment, is sense of security [22]. It is important that a sense of security is provided at urban public spaces, otherwise this could lead to negative effects such as fear, anti-social behavior, and stress outcomes [40]. Sense of security is related to safety, which is recognized to be one of the most important factors when evaluating the quality of public spaces [24]. When people perceive a place as unsafe, they could choose to use the place less often or even avoid it. Previous research showed that more green spaces in the living environment was found to affect people's perceived safety [41,42]. Feeling safe also depends on the time of the day [43], namely, people feel less safe in the evening than during the day. This might be caused by the fact that perceived prospect (i.e., ability to see) is lower in the evening. It is recognized that the ability to see is related to perceived environmental safety [44].

Comfort
With regard to feeling comfortable, research showed that openness and better acquaintance with a public space could improve people's perception of comfort of an urban public space [45]. Other characteristics that could contribute to comfort in public spaces are suitable and attractive street furniture, generous sidewalk width, and trees [6]. Furthermore, for people who attend a park for tranquility, besides quietness, visual aspects (i.e., aesthetic quality) are important aspects for feeling comfortable [46].

Momentary Experience of Urban Public Spaces
Studies focusing on all four dimensions of momentary SWB (i.e., emotional states) defined by Birenboim [22] are still limited. A single previous study by Weijs-Perrée et al. [47] analyzed the influence of people's momentary satisfaction with urban public spaces on people's momentary and long-term SWB, including all dimensions. They found a positive effect of the overall satisfaction with urban public spaces with people's momentary SWB (the sum score of the degree of feeling secure, comfortable, happy, and annoyed). However, this study did not look into detail at each emotional state and the differences between them. In addition, the effects of specific characteristics of satisfaction with urban public spaces (e.g., green, air quality, traffic safety or noise pollution) were not analyzed. Only a few studies have focused on analyzing the relationships between the momentary emotional state and the urban environment [22,48]. However, these studies are mainly based on a sample of students and therefore homogenous. Thus, research on momentary experiences with regard to multiple aspects of the urban public space in relation to people's emotional state is still limited. Air quality [15] Green/natural elements [30] Cleaning/ maintenance [34] Perceived safety [34] Smell [34] Noise [37] Smell [19,39] Control over time (e.g., looking for a parking space or traffic jams) [49] Perceived safety [24] Green/natural environments [41,42] Aesthetic quality [6,45,46] Noise [46] Atmosphere/ ambiance of a place [50] Distance to facilities (e.g., shops) [46] Furthermore, only a few studies tried to map emotions to specific places in cities. For instance, Matei, Ball-Rokeach and Qiu [51] tried to visualize feelings of fear and comfort in Los Angeles, based on people's perceived emotional response to places in the city. This study was based on perceived emotions Sustainability 2020, 12, 7921 5 of 20 from the past and did not focus on real-time emotions. Another study used GPS and geotagging techniques to measure people's experience of public open spaces [52]. However, this study only analyzed positive/negative experiences and did not look in detail at people's emotions in response to the urban environment. Furthermore, earlier studies did not incorporate the satisfaction with different attributes of urban environment in their studies. Therefore, it is still not clear which elements of the perceived urban public space are most important for explaining people's emotional state, also when controlling for objective and subjective characteristics of the momentary experiences and personal characteristics. Therefore, this current study contributes to previous research by using GPS location data (i.e., geotagging) to extract objective characteristics of the momentary experiences and analyze (near) real-time emotional responses to urban public spaces based on a dataset of experiences from a heterogeneous sample. Figure 1 shows the conceptual model with all expected relationships. Furthermore, only a few studies tried to map emotions to specific places in cities. For instance, Matei, Ball-Rokeach and Qiu [51] tried to visualize feelings of fear and comfort in Los Angeles, based on people's perceived emotional response to places in the city. This study was based on perceived emotions from the past and did not focus on real-time emotions. Another study used GPS and geotagging techniques to measure people's experience of public open spaces [52]. However, this study only analyzed positive/negative experiences and did not look in detail at people's emotions in response to the urban environment. Furthermore, earlier studies did not incorporate the satisfaction with different attributes of urban environment in their studies. Therefore, it is still not clear which elements of the perceived urban public space are most important for explaining people's emotional state, also when controlling for objective and subjective characteristics of the momentary experiences and personal characteristics. Therefore, this current study contributes to previous research by using GPS location data (i.e., geotagging) to extract objective characteristics of the momentary experiences and analyze (near) real-time emotional responses to urban public spaces based on a dataset of experiences from a heterogeneous sample. Figure 1 shows the conceptual model with all expected relationships.

Data Collection
The web-based data collection instrument consisted of two parts. For the first part, respondents were asked to answer questions about their demographics (i.e., age, gender, and education level), work situation, homeownership, and household composition. Furthermore, they were asked about their long-term subjective well-being (SWB). The measurement of SWB was based on the Satisfaction with Life Scale (SWLS) by Diener et al. [53], combined with the 10-item international Positive and Negative Affect Schedule Short Form (I-PANAS-SF) by Thompson [54]. This combined measurement was also used by Saw, Lim, and Carrasco [55]. The 5-item SWLS scale consists of the following items, namely "In most ways my life is close to my ideal," "The conditions of my life are excellent," "I am satisfied with my life," "So far I have gotten the important things I want in life," and ""If I could live my life over, I would change almost nothing." Participants were asked to indicate how much they agree or disagree with each of these items based on a 7-point scale ranging from (1) strongly disagree to (7) strongly agree.
For the 10-item I-PANAS-SF, participants were asked to rate on a scale from 1 (never) to 5 (always) how often they generally felt a particular emotion or feeling. This scale consists of several emotions to measure positive affect, namely, active, inspired, determined, alert (i.e., aware, watchful,

Data Collection
The web-based data collection instrument consisted of two parts. For the first part, respondents were asked to answer questions about their demographics (i.e., age, gender, and education level), work situation, homeownership, and household composition. Furthermore, they were asked about their long-term subjective well-being (SWB). The measurement of SWB was based on the Satisfaction with Life Scale (SWLS) by Diener et al. [53], combined with the 10-item international Positive and Negative Affect Schedule Short Form (I-PANAS-SF) by Thompson [54]. This combined measurement was also used by Saw, Lim, and Carrasco [55]. The 5-item SWLS scale consists of the following items, namely "In most ways my life is close to my ideal," "The conditions of my life are excellent," "I am satisfied with my life," "So far I have gotten the important things I want in life," and ""If I could live my life over, I would change almost nothing." Participants were asked to indicate how much they agree or disagree with each of these items based on a 7-point scale ranging from (1) strongly disagree to (7) strongly agree.
For the 10-item I-PANAS-SF, participants were asked to rate on a scale from 1 (never) to 5 (always) how often they generally felt a particular emotion or feeling. This scale consists of several emotions to measure positive affect, namely, active, inspired, determined, alert (i.e., aware, watchful, on guard), attentive (i.e., paying close attention to something), and to measure negative affect, namely, the emotions upset, hostile, ashamed, afraid, and nervous. Overall, long-term SWB was measured by the following sum, adapted from Saw, Lim, and Carrasco [55]: long-term SWB = positive affect (5 items) + reversed score of negative affect (5 items) + life satisfaction (5 items). It is suggested that a Cronbach's alpha of 0.7 (and sometimes 0.6) is acceptable [56]. Thus, the Cronbach's alpha of the total sum of these 15 items of 0.790 is acceptable.
Also, a single-item question was used to measure perceived health, namely, by asking respondents about their general health condition, based on a 5-point Likert scale ranging from (1) poor health to (5) excellent health. Next, for measuring personality and specifically the Big Five personality traits (i.e., extraversion, agreeableness, conscientiousness, emotional stability, and openness), the 10-item scale BFI-10 (Big Five Inventory) by Rammstedt and John [57] was used. This scale is based on the original 44-item Big Five Inventory [58] and consists of the ten personality traits, namely, (1) reserved, (2) generally trusted, (3) lazy, (4) relaxed, (5) few artistic interests, (6) outgoing, sociable, (7) tends to find fault with others, (8) does a thorough job, (9) nervous, and (10) an active imagination. The scoring of the personality traits was adapted from Rammstedt and John [57], namely, Extraversion: sum of item 1 (reversed) and item 6; Agreeableness: sum of item 2 and item 7 (reversed); Conscientiousness: sum of item 3 (reversed) and item 8; Neuroticism: sum of item 4 (reversed) and item 9; Openness: sum of item 5 (reversed) and item 10. The sum scores show low-to-moderate Cronbach's alphas (α = between 0.309 and 0.735) which indicates that the homogeneity was not so high, which is not surprising for short scales [59]. A previous study that measured personality traits, using the same method, also showed lower Cronbach's alphas, which is directly influenced by the low number of items (i.e., two items) [60].
Next, for the second part, an ESM approach was used. Specifically, the event-contingent ESM method was used to collect data on all positive and negative experiences and/or feelings with regard to urban public spaces in the city. The purpose of the event-contingent method is that participants are asked to report all events at the moment when they occur [23]. This ESM type is recommended, because the chance is limited that experiences with regard to the urban public environment occur within a short time period [61]. One of the main advantages of this sampling technique is that it is possible to repeatedly measure people's momentary experiences in a real-life situation for a longer period of time, compared to traditional questionnaires [22].
For the ESM approach, a web-based questionnaire was used. Respondents were asked to self-report all their experiences (not work-related and at-home experiences) with regard to urban public spaces in the city for two weeks. For example, when people walked alone in the evening around the train station and they felt very unsafe, they were asked to report this experience. For every experience, respondents were first asked to geotag their GPS location of their experience on a map from OpenStreetMap (OSM). Next, they were asked to answer several questions about the type of the location (e.g., leisure location, shopping, or relocating), activity during the experience, transportation mode to the experience location, previous knowledge of the location (i.e., familiarity), and company during the experience.
Furthermore, to measure respondents' momentary emotions (i.e., momentary SWB), they were asked to indicate, on a 5-point Likert scale, how secure, comfortable, happy, and annoyed they felt during the experience [22]. In the analyses, the reversed version of feeling annoyed is used, which makes it easier to compare it with the other emotional states that are positively oriented.
Finally, to measure the satisfaction with the urban environment, respondents were asked to indicate to what extent they were satisfied with several characteristics of urban public spaces at the moment of their experience. This question was based on a 5-point Likert scale, ranging from (1) very dissatisfied to (5) very satisfied. Based on the extensive literature review in the previous section, several characteristics were expected to influence people's emotional state (see Table 1).

Procedure
Data were collected in June 2019 among citizens of Eindhoven. The municipality of Eindhoven has a panel of citizens (called "Digipanel Eindhoven") who are willing to participate in research on city-related issues. Respondents of this current study were approached by using an online link to the Sustainability 2020, 12, 7921 7 of 20 first questionnaire in a newsletter, which was sent to all participants of the panel. They were also asked about their willingness to participate in the second part of the study (ESM part) and whether they wanted to share their email address. This way, we were able to remind them two times a days during two weeks to report all their experiences with regard to the urban public space in Eindhoven. It was important that respondents participated in the first (general questionnaire) and second part (ESM part) of this study to analyze the experiences. Therefore, participants who were not willing to share their email address were not able to continue the questionnaire. Furthermore, participants were asked to give their informed consent for inclusion before they participated in the study, and they were able to stop at any time during the research period.
To increase the response rate, participants were rewarded with a gift voucher of 10 euros when they participated in both the first and second part of this study. For the first part, the limit was set at 300 participants because of the budget limitations. Of these participants, 161 participants also reported one or more experiences during the two weeks (i.e., second ESM part). In total, these 161 participants reported 1056 momentary experiences (M = 6.56, SD = 6.32). Although participants were reminded two times a day for two weeks, many participants reported only one experience (see Figure 2). Therefore, many experiences were probably not recorded, which could have led to a biased sample. However, because of the high number of reported experiences (N = 1056), the dataset is still suitable for analyzing the relationship between experience characteristics and people's emotional state at the moment of the experience with the urban public space.

Analytical Approach
First, a test of parallel lines was performed to test the assumption of the ordered logit model that the regression coefficients are the same for all categories. The Chi-square statistics are significant for happiness (p = 0.00), sense of security (p = 0.00), comfortable (p = 0.00), and annoyed (reversed) (p = 0.00). Thus, the assumption of the ordered logit model was rejected. Therefore, it can be concluded that ordered logit coefficients are not equal across the levels of happiness, sense of security, comfortable, and annoyed (reversed) and that using an ordered logit model is not valid for analyzing these emotional states. Therefore, to analyze the relationships between satisfaction with the urban environment and people's momentary emotions (i.e., SWB) and controlling for personal (e.g., personality, age, or gender) and experience characteristics (e.g., time, location characteristics, weather, company, activity, and familiarity), a mixed multinomial logit model (MMNL) was used. A MMNL is a very efficient and flexible discrete choice model [62,63] for analyzing data with a panel structure (i.e., multiple experiences and related feelings/emotions by the same respondent). Furthermore, using this approach, it is possible to capture unobserved heterogeneity [64]. The model also accounts for the clustering of experiences in respondents.
In the estimated models, an experience is the unit of analysis and the dependent variable is people's momentary SWB, which consists of the emotional states: sense of security, comfort, happiness, and annoyance. For each of these emotional states, a MMNL model was estimated. In every model, the dependent variable was the "choice" or alternative for the emotional state at the moment of the experience with regard to the urban public space, whereby each emotional state consisted of three alternatives (i.e., a negative, neutral, and positive emotion, where neutral was taken as the base alternative). To reduce the number of parameters, the five categories of each emotional state were merged into three categories. For example, with regard to the emotional state "happiness," alternative 1 is unhappy, alternative 2 is neutral, and alternative 3 is happy. Furthermore, a random parameter was estimated for the utility constant term for each alternative of the people's emotional states during the experiences to capture possible heterogeneity in base preferences. The Cholesky decomposition was used to estimate correlations (i.e., similarities between categories within the emotional states) between the random parameters [63].
In each MMNL model, the independent variables, namely, subjective and objective experience characteristics, personal characteristics, and satisfaction with the urban environment, were included as interactions with all the emotional state alternatives (e.g., satisfaction with the atmosphere of urban public space × alternative 1: unhappy). The coefficients of the interaction terms are estimated as nonrandom parameters to reduce degrees of freedom. Furthermore, interaction terms for one independent variable were stepwise added and removed at a time. In addition, to compare the models of the different emotional states (i.e., sense of security, happiness, comfort, and annoyance), the same parameters were included in the four MMNL models.

Experience Characteristics
With regard to the experience characteristics (i.e., unit of analysis is an experience of an urban public space), Table 2 shows that slightly more than half of the experiences (58%) were with one or more other people and most experiences were outdoors (83%). Most experiences (37%) took place on the road (when relocating) or at an outdoor public space (e.g., park) (21%). Other experiences took place at a shop/mall (14%) or at a culture/sports venue or facility/café/restaurant/bar (13%). The transportation mode that was most frequently used to travel to the location of the experience was a bicycle (49%) or walking (30%). The average temperature during the experiences was 24 °C, and during 5% of the experiences it rained. Furthermore, a random parameter was estimated for the utility constant term for each alternative of the people's emotional states during the experiences to capture possible heterogeneity in base preferences. The Cholesky decomposition was used to estimate correlations (i.e., similarities between categories within the emotional states) between the random parameters [63].
In each MMNL model, the independent variables, namely, subjective and objective experience characteristics, personal characteristics, and satisfaction with the urban environment, were included as interactions with all the emotional state alternatives (e.g., satisfaction with the atmosphere of urban public space × alternative 1: unhappy). The coefficients of the interaction terms are estimated as nonrandom parameters to reduce degrees of freedom. Furthermore, interaction terms for one independent variable were stepwise added and removed at a time. In addition, to compare the models of the different emotional states (i.e., sense of security, happiness, comfort, and annoyance), the same parameters were included in the four MMNL models.

Experience Characteristics
With regard to the experience characteristics (i.e., unit of analysis is an experience of an urban public space), Table 2 shows that slightly more than half of the experiences (58%) were with one or more other people and most experiences were outdoors (83%). Most experiences (37%) took place on the road (when relocating) or at an outdoor public space (e.g., park) (21%). Other experiences took place at a shop/mall (14%) or at a culture/sports venue or facility/café/restaurant/bar (13%). The transportation mode that was most frequently used to travel to the location of the experience was a bicycle (49%) or walking (30%). The average temperature during the experiences was 24 • C, and during 5% of the experiences it rained.  Figure 3 shows the distribution of experiences in Eindhoven. The area was divided into 100 m hexagons and the number of experiences were counted per hexagon. Most experiences were reported in the city center, at or near parks (e.g., Genneper Park or Stadswandelpark), the central train station, and shopping areas. Figure 4 shows the intensity of the four dimensions of momentary subjective well-being (i.e., sense of security, happiness, comfort, and annoyance) at the moment of the experience. Overall, people felt very secure, happy, comfortable, and less annoyed during experiences in the city. However, during experiences in some parts of the city (e.g., areas in the city center, the Kruisstraat (i.e., multicultural street) and at tunnels), people felt more negative experiences. registered. These experiences were, in general, positive and showed a similar pattern as the whole city. Comparing the momentary experiences in Strijp-S to the overall experiences in the city, it was found that people felt on average happier (M = 3.777, SD = 1.395), more comfortable (M = 4.111, SD = 1.323) but more annoyed (M = 3.455, SD = 1.041) and less secure (M = 4.0, SD = 1.328) during their experiences in the Strijp-S area. The momentary experiences that were less positive were reported to be related to the traffic and parking spaces.   The results on the satisfaction with aspects of the urban environment show that, overall, people are satisfied with the urban public spaces. During 50% of the experiences, respondents were (very) satisfied with the smell (e.g., smell from traffic or restaurants), and during 53% of the experiences, respondents were (very) satisfied with natural elements. In addition, during 55% of the experiences, respondents were (very) satisfied with the traffic safety (e.g., sidewalks, speed humps, and traffic lights), and during 60% of the experiences, respondents were (very) satisfied with the air quality (e.g., air pollution from traffic or ventilation). Also, during the experiences, respondents were (very) The results on the satisfaction with aspects of the urban environment show that, overall, people are satisfied with the urban public spaces. During 50% of the experiences, respondents were (very) satisfied with the smell (e.g., smell from traffic or restaurants), and during 53% of the experiences, respondents were (very) satisfied with natural elements. In addition, during 55% of the experiences, respondents were (very) satisfied with the traffic safety (e.g., sidewalks, speed humps, and traffic lights), and during 60% of the experiences, respondents were (very) satisfied with the air quality (e.g., air pollution from traffic or ventilation). Also, during the experiences, respondents were (very) satisfied with the aesthetic quality (e.g., decor, design, architecture, or color schemes) (61%), (very) satisfied with the cleaning and maintenance of the urban public space (65%), (very) satisfied with the atmosphere (e.g., lively ambience) (67%), and (very) satisfied with the accessibility of the location (e.g., by car, by public transport, and walking) (76%).

Participant Characteristics
As can be seen in Table 3, the participants of this study consisted of a comparable share of women and men, which is comparable to the population of Eindhoven. In addition, the sample consists of a lower percentage of people aged between 18 and 35 years and a higher percentage of people aged over 45, compared to the population of Eindhoven. Thus, the sample is not completely representative of the population of Eindhoven. This is probably also related to the relatively high percentage of respondents who are retired, and who probably had more time to take part in this study. Next, a higher percentage of the participants are couples living without children and a lower percentage of the participants are one-person households, compared to the population of Eindhoven. Also, a large share of participants own their home and perceive their health as (very) good or excellent.   Table 4 shows the estimation results of the four MMNL models related to the emotional states (i.e., sense of security, happiness, comfort, and annoyance). Some characteristics of the urban environment, such as air quality, aesthetic quality, accessibility, natural elements, noise, and cleanliness and maintenance were not found to be significantly related to one of the emotional states. The related nonrandom parameters were stepwise removed from the models to reduce degrees of freedom. The significant standard deviations of the random parameters in Table 4 show that there exists unobserved heterogeneity in preferences between users of urban public spaces. These findings suggest, for example, that users differ in their propensity (i.e., chance) to have an emotional response (i.e., negative, neutral, or positive) to an urban public space.

Sense of Security
With regard to the first emotional state, namely, sense of security, the results showed that when people feel more satisfied with the traffic safety of the experience location, the probability is higher that they would also feel more secure. Also, when an experience takes place at an outdoor urban public space, people tend to feel less secure compared to an indoor experience. In addition, people feel less secure during relocating/travelling. A higher distance to shops also leads to higher levels of feeling secure. Finally, people feel more secure when they rate their overall well-being higher.

Happiness
The probability that people are happier is higher when people are more satisfied with the atmosphere (e.g., lively ambiance) and smell of the urban public space. In addition, people felt happier when relocating/travelling compared to other experienced locations (i.e., shop/mall). This could also be related to the result that when the distance to shops/malls is lower, the probability that people feel less happy is higher. This result suggests that a higher distance to shops leads to higher levels of happiness. A public outdoor location is also related to a higher probability of feeling happy. With regard to the day of the week, people feel happier during experiences on the weekend compared to experiences during weekdays. Time (i.e., daytime or evening) was not found to be significant and was therefore removed from the models. Also, age was found to be related to people's momentary SWB (i.e., happiness). The results suggested that people aged under 45 years feel less frequently unhappy during the momentary experiences than people older than 45 years. Finally, personality traits were found to be important for explaining people's happiness. The results showed that people who are more agreeable are less likely to feel unhappy, compared to people who are more neurotic.

Comfort
With regard to feeling comfortable, the results showed that when an experience takes place at an outdoor urban public space, people feel less comfortable than at indoor public spaces. People feel more comfortable at a leisure location (e.g., culture/sports venues or at a café/restaurant/bar) compared to other locations (e.g., shop/mall or during travelling). Being satisfied with traffic safety and smell of the urban public space is also important for feeling comfortable. In addition, the probability is lower that people with reasonable/bad perceived health conditions feel comfortable during the experience of the urban public space. Also, people who perceive their general well-being as more positive are more likely to feel comfortable during a momentary experience of an urban public space.

Annoyance
With regard to annoyance, the results showed that people feel more annoyed when relocating/travelling during an experience compared to other experienced locations (e.g., leisure location, public outdoor location, or shop/mall). Also, being satisfied with the traffic safety is important for not feeling annoyed. With regard to sufficient parking spaces, respondents feel less annoyed when they are more satisfied with the amount and quality of parking spaces at the urban public space. In addition, the results showed that people who walked (i.e., 30% of the experiences) to the location of the experience felt less annoyed compared to other transportation modes (e.g., bicycle, car, or public transport). Finally, when people perceive their overall subjective well-being as higher, they also feel less annoyed during a momentary experience.

Discussion and Future Directions
Only a few studies focused on people's emotional state in relation to satisfaction with urban public spaces based on experiences in the city. However, these are mainly based on a homogeneous sample (i.e., students) [22,48]. This study used a more heterogeneous sample among citizens of Eindhoven and aimed to analyze people's emotional state and how this is influenced by satisfaction with urban public spaces, when controlling for personal (e.g., age, gender, health, and personality) and experience characteristics (e.g., time/day, location characteristics, company, activity, and familiarity).
Significant relationships were found between people's emotional state and the momentary satisfaction with the urban space. A better-perceived atmosphere of an urban public space was found to lead to more positive emotional states. Atmosphere is related to the ambiance (e.g., cozy, lively, popular, or joyful, etc.) of an urban place, which is a multifaceted (physical, physiological, sociological, cultural, and psychological) concept. Although the ambiance of urban places is already recognized to have an effect on how people perceive places [50], it remains difficult to measure and analyze the atmosphere/ambiance of a place. Future research should analyze which design characteristics of the built environment could support the atmosphere or ambiance of urban public spaces.
With regard to transportation-related aspects, the results showed that traffic safety is an important indicator for people's emotions (i.e., momentary SWB). It is also recognized that there is a relationship between perceived safety and walkability of the environment and people's well-being [65]. Only a few studies found a positive relationship between perceived urban safety and people's emotional state (i.e., feelings of happiness) [17], but they did not look in detail at annoyance or comfort. More research is needed on measurements to improve perceived traffic safety in urban areas and how these measurements can be implemented in the urban design.
Walking as a transportation mode results in less annoyance among users of urban public spaces. This might suggest that the walking facilities are perceived qualitatively better than the other transportation facilities. In addition, people could also feel more annoyed because of the decreased control over time when using a car or public transport compared to walking. This is related to the results that people feel less annoyed if they perceive sufficient parking spaces. Robin, Matheau-Police and Couty [49] also suggested that the lack of control over time in relation to car use (e.g., looking for a parking space or a traffic jam) is an important environmental annoyance in urban areas. Thus, urban planners and policymakers could stimulate walking in urban areas by creating more attractive walkways or designing car-free areas, where people feel less annoyed, to increase positive momentary experiences.
Not all characteristics of urban public spaces that were found in the literature were also found to significantly affect momentary SWB, namely, air quality, aesthetic quality, accessibility, natural elements, noise, and cleanliness and maintenance were not significant. For example, previous studies showed that air pollution (i.e., air quality) [32] is negatively, and natural elements are positively [18], related to feelings of happiness, and that noise (e.g., from traffic) could lead to annoyance [36]. However, these studies mainly focused on one aspect of the urban environment. This suggests that some characteristics of the urban environment (e.g., traffic safety, atmosphere, and parking facilities) are more important than other characteristics.
The distance to shops was found to be an important indicator for people's emotional state (i.e., degree of feeling happy, comfortable, secure, and annoyed). A previous study also showed a significant relationship between distance of shops and people's long-term and momentary SWB [47]. Another study also showed that quiet places and going outside to walk are important for people with a higher need for quietness (i.e., people who are more annoyed by sound from traffic, shops, etc.) [66]. These quiet places, such as green areas in cities, are mostly located at a higher distance from shopping centers. Therefore, more quiet and green places should be designed in urban areas, so people would feel happier, comfortable, secure, and less annoyed. For future research, focus group discussions can be held to understand the underlying reasons for the evaluation of places regarding the distance to shops.
With regard to time influences, people report more positive emotional states during weekend experiences related to urban public spaces. This was also recognized by previous research [22,67]. The results did not show a significant relation between weather and people's momentary SWB. Probably other variables are more important for explaining momentary SWB. This could also be caused by the fact that only during 5% of the experiences it rained. Therefore, it is important for future studies to collect data during different seasons, to get more insight into weather influences.
Furthermore, relationships were found between personal characteristics and people's emotional state. People who, overall, perceive their well-being as higher are also more likely to report a more positive momentary SWB. This is also recognized by previous research [47,68]. People with perceived reasonable/bad health conditions feel less comfortable at urban public spaces compared to people with better health conditions. The results also suggest that people aged over 45 years feel more frequently unhappy than younger people. However, these vulnerable people (e.g., people with lower health conditions and the elderly) have the most need to access, for example, public parks and the opportunity to socially interact in a safe and comfortable urban public setting, which could contribute to their quality of life [69]. Therefore, more facilities for vulnerable people should be created at urban public spaces, so they would feel more comfortable and safe. Also, personality was found to influence people's emotional state, which confirms previous research [70]. Finally, no relationships were found between gender and the momentary SWB dimensions. This suggests that men and women do not differ in their emotions as outcomes of their experience with regard to urban public spaces.

Conclusions
Research that gives more insight into the relationships between subjective and objective characteristics of momentary experiences, momentary emotional states, and satisfaction with the urban environment is still limited, but highly important for urban planning processes. This study contributes to existing theory by analyzing the relationships between the satisfaction with urban public spaces and the dimensions of people's momentary SWB (i.e., sense of security, comfort, happiness, and annoyance) by using a novel approach, namely, a (near-real time) web-based ESM survey with a geotagging functionality. This functionality led to new insights of the impact of the objective experience characteristics (i.e., time and place) on people's emotional state. In addition, this study contributes to previous research by incorporating the satisfaction with different attributes of the urban environment in relation to momentary SWB. Also, this study shows that ESM is a valid and valuable approach for future studies on analyzing people's momentary experiences in relation to the built environment. This approach could be further developed in future studies, for example, by developing a more user-friendly smartphone application to analyze temporal differences of experiences. Although this study provided new insights related to the effects of urban design on people's momentary SWB, whereas previous studies mainly focus on long-term SWB, there are some limitations. First, through the ESM approach, a lot of time and commitment were demanded from the participants of this study, which led to a low response rate. Therefore, to increase the interpretation and generalizability of the results, a more representative and larger sample, also from other cities and counties, should be used. In addition, in future studies, focus groups and/or expert interviews should be held to strengthen and give more in-depth insights into the quantitative results.
The main limitation of this study is that participants did not report all their positive and negative momentary experiences with regard to any urban public space in Eindhoven during the two-week sampling period. This could lead to a response bias, as many respondents reported just one experience with regard to the public space. Also, there is a chance that people are more eager to report negative or just positive experiences. Therefore, it was not possible to analyze areas in the city that were experienced more positive compared to others.
Another limitation of this study is that it mainly focused on the perceived urban environment during the experience and on people's perceived SWB. Only a few objective measures (i.e., distance to facilities, weather, and time) were taken into account. It would be, for example, interesting for future research to include more objective measures of the urban environment (e.g., air quality or noise levels), subjective measures (e.g., architecture, culture, the atmosphere of the community), and of people's emotional state (e.g., stress levels by using wearables).
Overall, this study provided results which could be used by policymakers and urban planners to develop urban regeneration strategies. It also shows the importance of analyzing people's momentary experiences and their perception of urban public spaces for the planning process. To avoid deterioration, it is important to create urban public spaces where people have a more positive perception of the urban environment [13], which eventually could lead to happier, comfortable, more secure, and less-annoyed citizens. Future research is necessary to analyze the mediating effects of these momentary emotional responses of urban public spaces on people's long-term health and quality of life.