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Article

Role of Meteorological Parameters in the Diurnal and Seasonal Variation of NO2 in a Romanian Urban Environment

Faculty of Sciences and Environment, European Center of Excellence for the Environment, “Dunărea de Jos” University of Galați, 800008 Galați, Romania
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Int. J. Environ. Res. Public Health 2020, 17(17), 6228; https://doi.org/10.3390/ijerph17176228
Received: 16 July 2020 / Revised: 22 August 2020 / Accepted: 24 August 2020 / Published: 27 August 2020
(This article belongs to the Special Issue Air Pollution Meteorology)
The main purpose of this study was to investigate whether meteorological parameters (temperature, relative humidity, direct radiation) play an important role in modifying the NO2 concentration in an urban environment. The diurnal and seasonal variation recorded at a NO2 traffic station was analyzed, based on data collected in situ in a Romanian city, Braila (45.26° N, 27.95° E), during 2009–2014. The NO2 atmospheric content close to the ground had, in general, a summer minimum and a late autumn/winter maximum for most years. Two diurnal peaks were observed, regardless of the season, which were more evident during cold months. Traffic is an important contributor to the NO2 atmospheric pollution during daytime hours. The variability of in situ measurements of NO2 concentration compared relatively well with space-based observations of the NO2 vertical column by the Ozone Monitoring Instrument (OMI) satellite for most of the period under scrutiny. Data for daytime and nighttime (when the traffic is reduced) were analyzed separately, in the attempt to isolate meteorological effects. Meteorological parameters are not fully independent and we used partial correlation analysis to check whether the relationships with one parameter may be induced by another. The correlation between NO2 and temperature was not coherent. Relative humidity and solar radiation seemed to play a role in shaping the NO2 concentration, regardless of the time of day, and these relationships were only partially interconnected. View Full-Text
Keywords: nitrogen dioxide; in situ urban concentrations; meteorological measurements; NO2 variation; partial correlation nitrogen dioxide; in situ urban concentrations; meteorological measurements; NO2 variation; partial correlation
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MDPI and ACS Style

Voiculescu, M.; Constantin, D.-E.; Condurache-Bota, S.; Călmuc, V.; Roșu, A.; Dragomir Bălănică, C.M. Role of Meteorological Parameters in the Diurnal and Seasonal Variation of NO2 in a Romanian Urban Environment. Int. J. Environ. Res. Public Health 2020, 17, 6228. https://doi.org/10.3390/ijerph17176228

AMA Style

Voiculescu M, Constantin D-E, Condurache-Bota S, Călmuc V, Roșu A, Dragomir Bălănică CM. Role of Meteorological Parameters in the Diurnal and Seasonal Variation of NO2 in a Romanian Urban Environment. International Journal of Environmental Research and Public Health. 2020; 17(17):6228. https://doi.org/10.3390/ijerph17176228

Chicago/Turabian Style

Voiculescu, Mirela, Daniel-Eduard Constantin, Simona Condurache-Bota, Valentina Călmuc, Adrian Roșu, and Carmelia M. Dragomir Bălănică 2020. "Role of Meteorological Parameters in the Diurnal and Seasonal Variation of NO2 in a Romanian Urban Environment" International Journal of Environmental Research and Public Health 17, no. 17: 6228. https://doi.org/10.3390/ijerph17176228

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