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16 pages, 3151 KiB  
Article
Experimental Study on the Effects of Cockpit Noise on Physiological Indicators of Pilots
by Haiming Shen, Meiqing Hao, Jiawei Ren, Kun Chen and Yang Gao
Sensors 2025, 25(13), 4175; https://doi.org/10.3390/s25134175 - 4 Jul 2025
Viewed by 236
Abstract
Cockpit noise, as a critical environmental factor affecting flight safety, may impair pilots’ cognitive functions, leading to a decreased operational performance and decision-making errors, thereby posing potential threats to aviation safety. In order to reveal the relationship between the cockpit noise sound pressure [...] Read more.
Cockpit noise, as a critical environmental factor affecting flight safety, may impair pilots’ cognitive functions, leading to a decreased operational performance and decision-making errors, thereby posing potential threats to aviation safety. In order to reveal the relationship between the cockpit noise sound pressure level and pilot physiological indicators, and provide a scientific basis for cockpit noise airworthiness standards, this experiment takes pilot trainees as the research subject. Based on the principle of multimodal data synchronization, a sound field reconstruction system is used to reconstruct the cockpit sound field. Electroencephalogram (EEG), electrocardiogram (ECG), and electrodermal activity (EDA) measurements are carried out in different sound pressure level noise operating environments. The results show that with the increase in the sound pressure level, the significant suppression of α-wave activity in the occipital and parietal regions suggests that the cortical resting state is lifted and visual attention is enhanced; the enhancement of the β-wave in the frontal regions reflects the enhancement of alertness and prefrontal executive control, and the suppression of θ-wave activity in the frontal and temporal regions may indicate that cognitive tuning is suppressed, which reflects the brain’s rapid adaptive response to external noise stimuli in a high-noise environment; noise exposure triggers sustained sympathetic nerve hyperactivity, which is manifested by a significant acceleration of the heart rate and a significant increase in the mean value of skin conductance when the noise sound pressure level exceeds 70 dB(A). The correlation analysis between physiological indicators shows that cockpit noise has a multi-system synergistic effect on human physiological indicators. The experimental results indicate that noise has a significant impact on EEG, ECG, and EDA indicators. Full article
(This article belongs to the Section Biomedical Sensors)
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27 pages, 1579 KiB  
Review
Microplastics in Soil–Plant Systems: Current Knowledge, Research Gaps, and Future Directions for Agricultural Sustainability
by Zhangling Chen, Laura J. Carter, Steven A. Banwart and Paul Kay
Agronomy 2025, 15(7), 1519; https://doi.org/10.3390/agronomy15071519 - 22 Jun 2025
Viewed by 1426
Abstract
With the increasing accumulation of plastic residues in agricultural ecosystems, microplastics (MPs) have emerged as a novel and pervasive environmental risk factor threatening sustainable agriculture. Compared to aquatic systems, our understanding of MP dynamics in agricultural soils—particularly their transport mechanisms, bioavailability, plant uptake [...] Read more.
With the increasing accumulation of plastic residues in agricultural ecosystems, microplastics (MPs) have emerged as a novel and pervasive environmental risk factor threatening sustainable agriculture. Compared to aquatic systems, our understanding of MP dynamics in agricultural soils—particularly their transport mechanisms, bioavailability, plant uptake pathways, and ecological impacts—remains limited. These knowledge gaps impede accurate risk assessment and hinder the development of effective mitigation strategies. This review critically synthesises current knowledge in the study of MPs within soil–plant systems. It examines how MPs influence soil physicochemical properties, plant physiological processes, toxicological responses, and rhizosphere interactions. It further explores the transport dynamics of MPs in soil–plant systems and recent advances in analytical techniques for their detection and quantification. The role of plant functional traits in mediating species-specific responses to MP exposure is also discussed. In addition, the review evaluates the ecological relevance of laboratory-based findings under realistic agricultural conditions, highlighting the methodological limitations imposed by pollution heterogeneity, complex exposure scenarios, and detection technologies. It also examines existing policy responses at both regional and global levels aimed at addressing MP pollution in agriculture. To address these challenges, we propose future research directions that include the integration of multi-method detection protocols, long-term and multi-site field experiments, the development of advanced risk modelling frameworks, and the establishment of threshold values for MP residues in edible crops. Additionally, we highlight the need for future policies to regulate the full life cycle of agricultural plastics, monitor soil MP residues, and integrate MP risks into food safety assessments. This review provides both theoretical insights and practical strategies for understanding and mitigating MP pollution in agroecosystems, supporting the transition toward more sustainable, resilient, and environmentally sound agricultural practices. Full article
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17 pages, 2178 KiB  
Article
Tissue Element Levels and Heavy Metal Burdens in Bottlenose Dolphins That Stranded in the Mississippi Sound Surrounding the 2019 Unusual Mortality Event
by Nelmarie Landrau-Giovannetti, Ryanne Murray, Stephen Reichley, Debra Moore, Theresa Madrigal, Ashli Brown, Ashley Meredith, Christina Childers, Darrell Sparks, Moby Solangi, Anna Linhoss, Beth Peterman, Mark Lawrence and Barbara L. F. Kaplan
Toxics 2025, 13(6), 511; https://doi.org/10.3390/toxics13060511 - 18 Jun 2025
Viewed by 900
Abstract
In 2019, an unusual mortality event (UME) affected bottlenose dolphins (Tursiops truncatus) in the Mississippi Sound (MSS) following an extended dual opening of the Bonnet Carré Spillway (BCS), which prevents flooding in New Orleans. This resulted in low salinity, skin lesions, and [...] Read more.
In 2019, an unusual mortality event (UME) affected bottlenose dolphins (Tursiops truncatus) in the Mississippi Sound (MSS) following an extended dual opening of the Bonnet Carré Spillway (BCS), which prevents flooding in New Orleans. This resulted in low salinity, skin lesions, and electrolyte imbalances in dolphins. Additionally, the influx likely altered the MSS’s environmental chemical composition, including levels of heavy metals and metalloids; thus, we quantified heavy metals, metalloids, and essential elements in the tissues of dolphins that stranded in the MSS before and after the 2019 UME. We hypothesized that levels of heavy metals and metalloids (such as mercury (Hg), arsenic (As), lead (Pb), and cadmium (Cd)) would not show significant changes post-UME. Indeed, we found no major changes associated with the UME in most metals; sodium (Na) and magnesium (Mg) levels were lower in several tissues after 2019, which correlated with the average yearly salinity measured from the MSS. Toxic metals and metalloids were detectable with some changes over time; however, the selenium (Se):Hg molar ratio increased in some tissues post-2019. Additionally, we confirmed that Hg can bioaccumulate, with positive correlations between Hg levels and dolphin size as assessed by straight length. Overall, our findings indicate that freshwater incursions into the MSS can alter dolphin exposure to essential and toxic elements. Full article
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16 pages, 4737 KiB  
Article
Horn Use Patterns and Acoustic Characteristics in Congested Urban Traffic: A Case Study of Ho Chi Minh City
by Thulan Nguyen, Yuya Nishimura and Sohei Nishimura
Acoustics 2025, 7(2), 36; https://doi.org/10.3390/acoustics7020036 - 16 Jun 2025
Viewed by 555
Abstract
Motorcycle horns are a dominant source of urban noise in many Southeast Asian cities, driven by high two-wheeler density and limited public transport infrastructure. Although automobiles have been in use for over a century, regulations governing horn design and volume control remain inadequate. [...] Read more.
Motorcycle horns are a dominant source of urban noise in many Southeast Asian cities, driven by high two-wheeler density and limited public transport infrastructure. Although automobiles have been in use for over a century, regulations governing horn design and volume control remain inadequate. This study investigates horn use behavior in Vietnamese urban traffic, identifying distinct acoustic patterns categorized as “attention” and “warning” signals. Measurements conducted in an anechoic chamber reveal that these patterns can increase sound pressure levels by up to 17 dB compared to standard horn use, with notable differences in frequency components. These levels often exceed the daytime noise thresholds recommended by the World Health Organization (WHO), indicating potential risks for adverse health outcomes, such as elevated stress, hearing damage, sleep disturbance, and cardiovascular effects. The findings are contextualized within broader efforts to manage traffic noise in rapidly developing urban areas. Drawing parallels with studies on aircraft noise exposure in Japan, this study suggests that long-term exposure, rather than peak noise levels alone, plays a critical role in shaping community sensitivity. The study results support the need for updated noise regulations that address both the acoustic and perceptual dimensions of road traffic noise. Full article
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17 pages, 360 KiB  
Review
Influence of Sensory Needs on Sleep and Neurodevelopmental Care in At-Risk Neonates
by Axel Hübler
Children 2025, 12(6), 781; https://doi.org/10.3390/children12060781 - 16 Jun 2025
Viewed by 684
Abstract
Objective: The development of a normal sleep–wake rhythm in the first weeks of life depends on the physiological sensory needs of the newborn as well as the environment surrounding them. This includes, for example, avoiding pain, exposure to bright light at night and [...] Read more.
Objective: The development of a normal sleep–wake rhythm in the first weeks of life depends on the physiological sensory needs of the newborn as well as the environment surrounding them. This includes, for example, avoiding pain, exposure to bright light at night and high noise levels. In high-risk newborns, this process can be influenced by immaturity of the central and peripheral nervous systems, therapeutic strategies and the work organization of an intensive care unit. Methods: This study used a narrative review to examine the literature on the interrelationship of sensory modalities on sleep–wake behavior in the context of neonatal intensive care. The current Cochrane reviews on cycled lighting’s effect on premature infants’ circadian rhythm development and noise or sound management in the neonatal intensive care unit, as well as the World Health Organization (WHO) global position paper on kangaroo mother care, were included. Results: An extensive body of literature relates to fetal and neonatal development of the five sensory modalities: touch, taste, smell, hearing and sight. In contrast, there is a lack of evidence regarding the choice of optimal lighting and suitable measures for noise reduction. Since 2023, the WHO has recommended that, from the moment of birth, every “small and sick” newborn should remain in skin-to-skin contact (SSC) with their mother. Developmental support pursues a multimodal approach with the goal of fostering early parent–child bonding, including the child’s needs and environmental conditions. Discussion: The implementation of early SSC and attention to the sleep–wake cycle require systemic changes in both the obstetric and neonatal settings to ensure seamless perinatal management and subsequent neonatal intensive care. Since there is a lack of evidence on the optimal sensory environment, well-designed, well-conducted and fully reported randomized controlled trials are needed that analyze short-term effects and long-term neurodevelopmental outcomes. Full article
(This article belongs to the Special Issue Current Advances in Paediatric Sleep Medicine)
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9 pages, 1027 KiB  
Article
Impact of Different Occupational Noises on Static and Dynamic Postural Stability in Healthy Young Adults
by Kristy Gourley, Harish Chander, Asher Street Beam and Adam C. Knight
Int. J. Environ. Res. Public Health 2025, 22(5), 679; https://doi.org/10.3390/ijerph22050679 - 25 Apr 2025
Viewed by 909
Abstract
Background: Sounds that cause disturbances and perturbations to the vestibular (inner ear organ responses) and visual (acute oculomotor responses) systems can impact postural stability. The purpose of this study was to assess the impact of different types of sounds and noises on both [...] Read more.
Background: Sounds that cause disturbances and perturbations to the vestibular (inner ear organ responses) and visual (acute oculomotor responses) systems can impact postural stability. The purpose of this study was to assess the impact of different types of sounds and noises on both static and dynamic PS. Methods: A total of 20 participants (12 females and 8 males; age: 21.35 ± 1.79 years; height: 170.7 ± 9.3 cm; mass: 66.725 ± 14.1 kg) were tested using the limits of stability (LOS) test on the BTrackS™ balance plate and a Timed Up and Go (TUG) test, when exposed to four different sounds and occupational noises [construction noise (CN), white noise (WN), sirens (SRs), and nature sounds (NAs)] in a randomized order with a no sounds (NSs) control performed initially (intensity range of 70–80 dB). The center of pressure (COP) total sway area (cm2) from the LOS and the time to completion of the TUG (seconds) were analyzed using a one-way repeated measures of analysis of variance at an alpha level of 0.05. Results: The observations demonstrated significant differences between the sounds and noises for the TUG (p < 0.001) but not for the LOS test (p = 0.406). Pairwise comparisons for the significant main effect for the TUG revealed that NSs demonstrated significantly slower time to completion compared to CN, WN, and SRs but not NAs. Conclusions: The findings suggest that the different sounds and noises did not impact static PS during the LOS test, which involved the voluntary excursion of the COP while maintaining the same base of support (BOS). However, during dynamic PS with a changing BOS while walking in the TUG, exposure to CN, SRs, and WN demonstrated a faster completion time than NSs or NAs. This finding may be attributed to the anxiety induced by the noise immersion and perception of sounds, compared to calm NAs and no sounds. The findings can aid in better understanding the impact of different occupational noises on PS and emphasize the need for better noise protection and reduction in loud work environments. Full article
(This article belongs to the Special Issue Work Environment Effects on Health and Safety of Employees)
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17 pages, 1503 KiB  
Article
The Influence of Language Experience on Speech Perception: Heritage Spanish Speaker Perception of Contrastive and Allophonic Consonants
by Amanda Boomershine and Keith Johnson
Languages 2025, 10(5), 86; https://doi.org/10.3390/languages10050086 - 23 Apr 2025
Viewed by 623
Abstract
It is well known that a listener’s native phonological background has an impact on how speech sounds are perceived. Native speakers can distinguish sounds that serve a contrastive function in their language better than sounds that are not contrastive. However, the role of [...] Read more.
It is well known that a listener’s native phonological background has an impact on how speech sounds are perceived. Native speakers can distinguish sounds that serve a contrastive function in their language better than sounds that are not contrastive. However, the role of allophony in speech perception is understudied, especially among heritage speakers. This paper highlights a study that directly tests the influence of the allophonic/phonemic distinction on perception by Spanish heritage speakers, comparing their results to those of late bilingual and monolingual speakers of Spanish and English in the US. Building on an earlier study, the unique contribution of this paper is a study of the perceptual pattern shown by heritage speakers of Spanish and a comparison of bilingual and monolingual speakers of English and Spanish. The participants completed a similarity rating task with stimuli containing VCV sequences with the intervocalic consonants [d], [ð], and [ɾ]. The heritage speakers, who are early sequential bilinguals of Spanish and English, showed a perceptual pattern that is more like monolingual Spanish listeners than monolingual English listeners, but still intermediate between the two monolingual groups. Specifically, they perceived [d]/[ɾ] like the L1 Spanish participants, treating them as very different sounds. They perceived the pair [d]/[ð], which is contrastive in English but allophonic in Spanish, like the L1 Spanish participants, as fairly similar sounds. Finally, heritage speakers perceived [ɾ]/[ð], contrastive in both languages, as very different sounds, identical to all other participant groups. The results underscore both the importance of surface oppositions, suggesting the need to reconsider the traditional definition of contrast, as well as the importance of considering level and age of exposure to the second language when studying the perception of sounds by bilingual speakers. Full article
(This article belongs to the Special Issue Phonetics and Phonology of Ibero-Romance Languages)
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27 pages, 3004 KiB  
Article
Designing for Neonates’ Wellness: Differences in the Reverberation Time Between an Incubator Located in an Open Unit and in a Private Room of a NICU
by Virginia Puyana-Romero, Daniel Nuñez-Solano, Ricardo Hernández-Molina, Francisco Fernández-Zacarías, Juan Jimenez and Giuseppe Ciaburro
Buildings 2025, 15(9), 1411; https://doi.org/10.3390/buildings15091411 - 22 Apr 2025
Viewed by 394
Abstract
Noise levels in Neonatal Intensive Care Units (NICUs) significantly impact neonatal health, influencing stress levels, sleep cycles, and overall development. One critical factor in managing noise is reverberation time (T), which affects sound persistence and acoustic comfort. This study, conducted at the Universidad [...] Read more.
Noise levels in Neonatal Intensive Care Units (NICUs) significantly impact neonatal health, influencing stress levels, sleep cycles, and overall development. One critical factor in managing noise is reverberation time (T), which affects sound persistence and acoustic comfort. This study, conducted at the Universidad de Las Américas in Quito, Ecuador, examines T in two NICU room types—open unit and private room. Measurements were taken in simulated environments to assess acoustic differences between these two designs. Results indicate that T is significantly lower in private rooms compared to open units, suggesting that private rooms provide a more controlled and acoustically favorable environment for neonates. Lower T reduces excessive noise exposure, improving sleep quality and minimizing stress responses in preterm infants. Furthermore, the findings align with Sustainable Development Goals (SDGs), particularly SDG 3 (Good Health and Well-being) and SDG 11 (Sustainable Cities and Communities), by advocating for hospital designs that enhance patient health and promote sustainable infrastructure. These results highlight the importance of integrating acoustically optimized spaces in NICUs to improve neonatal outcomes and contribute to a more sustainable healthcare system. Future research should further explore architectural solutions for noise reduction to refine NICU design standards. Full article
(This article belongs to the Special Issue Acoustics and Well-Being: Towards Healthy Environments)
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17 pages, 1788 KiB  
Article
Effects of Long-Term Airport Noise Exposure on Inflammation and Intestinal Flora and Their Metabolites in Mice
by Jian Yang, Longwei Wei, Yuan Xia, Junyi Wang, Yan Bai and Yun Xia
Metabolites 2025, 15(4), 251; https://doi.org/10.3390/metabo15040251 - 5 Apr 2025
Viewed by 691
Abstract
Background: The World Health Organization has indicated that airport noise is strongly associated with cardiovascular disease, with vascular inflammation identified as the primary mechanism. Therefore, long-term exposure to airport noise is considered far more harmful than other types of noise. However, there [...] Read more.
Background: The World Health Organization has indicated that airport noise is strongly associated with cardiovascular disease, with vascular inflammation identified as the primary mechanism. Therefore, long-term exposure to airport noise is considered far more harmful than other types of noise. However, there remains a lack of research into the mechanisms underlying long-term exposure to airport noise and harm to the human body. Methods: A mouse model was established and exposed to airport noise at a maximum sound pressure level of 95 dB(A) and an equivalent continuous sound pressure level of 72 dB(A) for 12 h per day over a period of 100 days. Quantitative polymerase chain reaction (qPCR) was used to detect the mRNA expression levels of pro-inflammatory and anti-inflammatory factors. Enzyme-linked immunosorbent assay (ELISA) was used to detect LPS, LTA, TMA, and TMAO levels. Intestinal flora composition was analyzed by 16S rDNA sequencing, and targeted metabolomics was employed to determine the levels of serum short-chain fatty acids. Results: Long-term airport noise exposure significantly increased systolic blood pressure, diastolic blood pressure, and mean blood pressure (p < 0.05); significantly increased the mRNA expression levels of oxidative stress parameters (nuclear matrix protein 2, 3-nitrotyrosine, and monocyte chemoattractant protein-1) (p < 0.05); significantly increased pro-inflammatory factors (interleukin 6 and tumor necrosis factor alpha) (p < 0.05); significantly decreased the mRNA expression level of anti-inflammatory factor interleukin 10 (p < 0.05); and significantly increased the content of LPS and LTA (p < 0.05). The composition of the main flora in the intestinal tract was structurally disordered, and there were significant differences between the noise-exposed and control groups at the levels of the phylum, family, and genus of bacteria. β-diversity of the principal component analysis diagrams was clearly distinguished. Compared with those of the control group, TMA-producing bacteria and levels of TMA and TMAO were significantly reduced, and the serum ethanoic acid and propanoic acid levels of the noise-exposed group were significantly decreased (p < 0.05). Conclusions: Long-term airport noise exposure causes significant elevation of blood pressure and structural disruption in the composition of the intestinal flora in mice, leading to elevated levels of oxidative stress and inflammation, resulting in metabolic disorders that lead to significant changes in the production of metabolites. Full article
(This article belongs to the Special Issue Environmental Metabolites Insights into Health and Disease)
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23 pages, 6190 KiB  
Article
Exposure to Noise from Agricultural Machinery: Risk Assessment of Agricultural Workers in Italy
by Valerio Di Stefano, Massimo Cecchini, Simone Riccioni, Giorgia Di Domenico and Leonardo Bianchini
AgriEngineering 2025, 7(3), 87; https://doi.org/10.3390/agriengineering7030087 - 19 Mar 2025
Viewed by 717
Abstract
Accidents and deaths at work are a persistent problem, with numbers still worrying. The agricultural and forestry sector is among the most exposed to work risks, with particular attention to noise risk from the use of agricultural machinery and operators. This study aims [...] Read more.
Accidents and deaths at work are a persistent problem, with numbers still worrying. The agricultural and forestry sector is among the most exposed to work risks, with particular attention to noise risk from the use of agricultural machinery and operators. This study aims to analyze the exposure to noise risk during use of wheeled and tracked tractors, with or without a cab, as well as other operating machines. The analysis takes into account the parameters Lpeak (peak sound pressure values), LAeq.T (time-weighted equivalent noise exposure levels) and LAS (maximum and minimum values weighted according to the Slow time constant) in order to assess the noise impact and define strategies for improving the safety and health of workers. This study demonstrates that in multiple cases, the regulatory thresholds for the examined variables are exceeded, regardless of the presence of a cabin. Specifically, Lpeak values approach 140 dB, dangerous to human health, while LAeq.T levels are close to or, in some instances, exceed 87 dB. It is also verified that agricultural and forestry operators who mainly use crawler tractors have greater and constant exposure to noise compared to those who use tractors with a cabin. Full article
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28 pages, 1682 KiB  
Article
Comparison of Operational Jet Fuel and Noise Exposure for Flight Line Personnel at Japanese and United States Air Bases in Japan
by David R. Mattie, Dirk Yamamoto, Kerrine LeGuin, Elizabeth McKenna, Daniel A. Williams, Alex Gubler, Patricia N. Hammer, Nobuhiro Ohrui, Satoshi Maruyama and Asao Kobayashi
Toxics 2025, 13(2), 121; https://doi.org/10.3390/toxics13020121 - 5 Feb 2025
Viewed by 1353
Abstract
Flight line personnel are constantly exposed to noise and jet fuel while working on flight lines. Studies suggest that jet fuel in combination with noise affects hearing loss more than noise exposure alone. This study examined the combined effects of jet fuel and [...] Read more.
Flight line personnel are constantly exposed to noise and jet fuel while working on flight lines. Studies suggest that jet fuel in combination with noise affects hearing loss more than noise exposure alone. This study examined the combined effects of jet fuel and noise exposure on the hearing of flight line personnel stationed at Japan Air Self-Defense Force Air Bases (Hamamatsu, Matsushima, Hyakuri, Yokota, and Iruma) and US Air Force Air Bases (Kadena and Misawa) in Japan. Samples were collected from all participants, 97 flightline-exposed and 71 control volunteers, to measure their individual noise levels with a personal sound level meter and volatile organic chemicals (VOCs) with a chemical sampling pump during a single shift. Blood samples were collected post shift. Urine samples (entire void) were collected prior to the shift (morning first void) and post shift. VOCs were measured in air, blood, and urine. An audiometric test battery, consisting of immittance measurements, audiograms, distortion product otoacoustic emissions, and the auditory brain response, was conducted after the shift to examine the hearing of participants. Total VOCs in personal air samples were in the ppb range for each group. Tinnitus and temporary hearing loss were reported in audiological histories but were also present in some controls. Noise levels on the flight line were greater than the action level for requiring hearing protection and exceeded exposure limits, but all exposed subjects reported wearing hearing protection. Audiometric tests identified significant differences and trends between flight line and control personnel, indicating the potential for hearing disorders. In spite of very low levels of VOC exposure and wearing hearing protection for noise, there is still the potential for hearing issues in flight line personnel. Full article
(This article belongs to the Special Issue The Toxicological Impact of Jet and Rocket Fuel on Human Health)
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20 pages, 4809 KiB  
Article
Design and Evaluation of Noise Simulation Algorithm Using MATLAB Ray Tracing Engine for Noise Assessment and Prediction
by Precin Kalisalvan, Mohd Sayuti Ab Karim and Siti Nurmaya Musa
Appl. Sci. 2025, 15(3), 1009; https://doi.org/10.3390/app15031009 - 21 Jan 2025
Viewed by 1148
Abstract
The Malaysian Department of Occupational Safety and Health (DOSH) reported that noise-induced hearing loss (NIHL) accounted for 92% of occupational diseases in 2019. To address this, accurate risk assessment is crucial. The current noise evaluation methods are complex and time-consuming, relying on manual [...] Read more.
The Malaysian Department of Occupational Safety and Health (DOSH) reported that noise-induced hearing loss (NIHL) accounted for 92% of occupational diseases in 2019. To address this, accurate risk assessment is crucial. The current noise evaluation methods are complex and time-consuming, relying on manual calculations and field measurements. An easy-to-use, open-source noise simulator that directly compares the output with national standards would help mitigate this issue. This research aims to develop an advanced noise evaluation tool to assess and predict unregulated workplace noise, providing tailored safety recommendations. Using a representative plant layout, the Sound Pressure Level (SPL) is calculated using MATLAB’s ray tracing propagation model. The model simulates all possible transmission paths from the source to the receiver to derive the resultant SPL. A noise simulation application featuring a graphical user interface (GUI) built with MATLAB’s App Designer (version: R2024a) automates these computations. The simulation results are validated against the DOSH’s safety standards in Malaysia. Additional safety metrics, such as the recommended maximum exposure time and the required Noise Reduction Rating (NRR) for hearing protection, are calculated based on the SPLs for hazardous locations. The simulation algorithm’s functionality is validated against manual calculations, with an average deviation of just 3.06 dB, demonstrating the model’s precision. This tool can assess and predict indoor noise levels, provide information on optimal exposure limits, and recommend necessary protective measures, ultimately reducing the risk of NIHL in factory environments. It can potentially optimise plant floor operations for existing and new facilities, ensuring safer shift operations and reducing worker noise hazard exposure. Full article
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14 pages, 2225 KiB  
Article
Assessment of Indoor Classroom Environment Quality Associated with Student Sleepiness: Pathways Towards a Sustainable Environment Through a Pilot Study
by Alexandro Andrade, Anderson D’Oliveira, Joaquim Henrique Lorenzetti Branco, Aldo Russi, Luca Stabile and Giorgio Buonanno
Sustainability 2025, 17(2), 506; https://doi.org/10.3390/su17020506 - 10 Jan 2025
Viewed by 1415
Abstract
Student sleepiness during classes is a frequently reported condition that can impair performance in the teaching–learning process and is even unsustainable for health. Although the environmental quality of the classroom may affect the students’ sleepiness, studies that exhaustively investigate the relationship between indoor [...] Read more.
Student sleepiness during classes is a frequently reported condition that can impair performance in the teaching–learning process and is even unsustainable for health. Although the environmental quality of the classroom may affect the students’ sleepiness, studies that exhaustively investigate the relationship between indoor environmental quality (IEQ) and sleepiness levels in classrooms are lacking. To this end, in the present paper, we carried out an experimental pilot study involving twenty-seven Italian adolescent students to determine the increase in their sleepiness rate during the school period utilizing the Epworth Sleepiness Scale (ESS). The analysis was performed in a classroom in which the indoor environmental quality was monitored, including measurements of the thermal comfort, sound pressure level, illuminance, carbon dioxide (CO2) concentrations, and airborne particle concentrations (both sub-micrometric particles and PM10). Three measurement days were considered. The results showed that student sleepiness significantly increased during the school period (Day 1 p = 0.00, Day 2 p = 0.03, and Day 3 p = 0.03). This increase was observed on measurement days characterized as having both perceived higher and lower thermal comfort and even in the presence of limited exposure to airborne particle concentrations, presenting an association with the high indoor concentration of CO2 detected in the classroom (Day 1 between 978 and 3261 ppm; Day 2 between 1044 and 2338 ppm; Day 3 between 1116 and 2623 ppm), due to reduced ventilation rates and the students’ sleepiness. Thus, the findings suggest that adequate ventilation rates can limit the increase in the rate of sleepiness, indicating, from our pilot study, that recommendations of sustainable environmental practices through comprehensive feasibility studies can promote positive changes in indoor environments such as classrooms. Full article
(This article belongs to the Section Health, Well-Being and Sustainability)
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19 pages, 3777 KiB  
Article
Interventions by Cardiovascular Drugs Against Aircraft Noise-Induced Cardiovascular Oxidative Stress and Damage
by Marin Kuntić, Ivana Kuntić, Jiayin Zheng, Leonardo Nardi, Matthias Oelze, Arijan Valar, Dominika Mihaliková, Lea Strohm, Henning Ubbens, Qi Tang, Liyu Zhang, Guilherme Horta, Paul Stamm, Omar Hahad, Dilja Krueger-Burg, Huige Li, Sebastian Steven, Adrian Gericke, Michael J. Schmeisser, Thomas Münzel and Andreas Daiberadd Show full author list remove Hide full author list
Antioxidants 2025, 14(1), 59; https://doi.org/10.3390/antiox14010059 - 7 Jan 2025
Cited by 2 | Viewed by 2024
Abstract
Noise pollution is a known health risk factor and evidence for cardiovascular diseases associated with traffic noise is growing. At least 20% of the European Union’s population lives in noise-polluted areas with exposure levels exceeding the recommended limits of the World Health Organization, [...] Read more.
Noise pollution is a known health risk factor and evidence for cardiovascular diseases associated with traffic noise is growing. At least 20% of the European Union’s population lives in noise-polluted areas with exposure levels exceeding the recommended limits of the World Health Organization, which is considered unhealthy by the European Environment Agency. This results in the annual loss of 1.6 million healthy life years. Here, we investigated the protective effects of cardiovascular drug interventions against aircraft noise-mediated cardiovascular complications such as elevated oxidative stress or endothelial dysfunction. Using our established mouse exposure model, we applied mean sound pressure levels of 72 dB(A) for 4 d. C57BL/6 mice were treated with the beta-blocker propranolol (15 mg/kg/d s.c. for 5 d) or the alpha-blocker phenoxybenzamine (1.5 mg/kg/d s.c. for 5 d) and noise-exposed for the last 4 d of the drug administration. Short-term noise exposure caused hypertension (measured by tail-cuff blood pressure monitoring) and impaired endothelial function (measured by isometric tension recording in the aorta and video microscopy in cerebral arterioles in response to acetylcholine). Noise also increased markers of oxidative stress and inflammation. Treatment of mice with propranolol and phenoxybenzamine prevented endothelial and microvascular dysfunction, which was supported by a decrease in markers of inflammation and oxidative stress in heart tissue and the brain. Amelioration of noise-induced hypertension (systolic blood pressure) was not observed, whereas pulse pressure was lowered by trend. This study provides a novel perspective mitigating the adverse effects of noise pollution, especially in vulnerable groups with medication, a rationale for further pharmacological human studies. Full article
(This article belongs to the Special Issue Oxidative-Stress in Human Diseases—3rd Edition)
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12 pages, 1481 KiB  
Article
Design, Development, and Testing of a New Device to Prevent High-Frequency Noise-Induced Damage: The “Dynamic Earplug”
by Lucrezia Giorgi, Antonio Moffa, Marco Mattaroccia, Michele Antonio Lopez, Emiliano Schena and Manuele Casale
Inventions 2025, 10(1), 2; https://doi.org/10.3390/inventions10010002 - 4 Jan 2025
Viewed by 1105
Abstract
Hearing loss resulting from prolonged exposure to loud noise is known as noise-induced hearing loss (NIHL), and it often affects professionals exposed to occupational sources of high sound levels. Among the professionals chronically exposed to noise, dentists use instrumentation that produces high-frequency noise. [...] Read more.
Hearing loss resulting from prolonged exposure to loud noise is known as noise-induced hearing loss (NIHL), and it often affects professionals exposed to occupational sources of high sound levels. Among the professionals chronically exposed to noise, dentists use instrumentation that produces high-frequency noise. In this occupational category, NIHL is estimated to reach a 5% to 20% prevalence of workers. However, dentists and healthcare personnel have no suitable personal protection equipment designed for their needs. The study aims to develop a new individual hearing protection device called the “dynamic earplug”, which protects from high-frequency noise and amplifies speech frequencies. Testing with the Fonix 7000 Hearing Aid Test System showed effective filtering of high frequencies (above 4000 Hz) from dental instruments and a speech frequency amplification of up to 13 dB (500 Hz–1000 Hz). In a trial involving 20 subjects during an 8 h work shift, most participants positively evaluated the device’s esthetics, ease of insertion, comfort, stability, and noise attenuation while still being able to hear patients’ and colleagues’ voices. The dynamic earplug shows promise as an efficient and comfortable hearing protection solution for professionals exposed to high-frequency noise. Full article
(This article belongs to the Section Inventions and Innovation in Advanced Manufacturing)
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