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Role of Meteorological Parameters in the Diurnal and Seasonal Variation of NO 2 in a Romanian Urban Environment

Author

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  • Mirela Voiculescu

    (Faculty of Sciences and Environment, European Center of Excellence for the Environment, “Dunărea de Jos” University of Galați, 800008 Galați, Romania)

  • Daniel-Eduard Constantin

    (Faculty of Sciences and Environment, European Center of Excellence for the Environment, “Dunărea de Jos” University of Galați, 800008 Galați, Romania)

  • Simona Condurache-Bota

    (Faculty of Sciences and Environment, European Center of Excellence for the Environment, “Dunărea de Jos” University of Galați, 800008 Galați, Romania)

  • Valentina Călmuc

    (Faculty of Sciences and Environment, European Center of Excellence for the Environment, “Dunărea de Jos” University of Galați, 800008 Galați, Romania)

  • Adrian Roșu

    (Faculty of Sciences and Environment, European Center of Excellence for the Environment, “Dunărea de Jos” University of Galați, 800008 Galați, Romania)

  • Carmelia Mariana Dragomir Bălănică

    (Faculty of Sciences and Environment, European Center of Excellence for the Environment, “Dunărea de Jos” University of Galați, 800008 Galați, Romania)

Abstract

The main purpose of this study was to investigate whether meteorological parameters (temperature, relative humidity, direct radiation) play an important role in modifying the NO 2 concentration in an urban environment. The diurnal and seasonal variation recorded at a NO 2 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 NO 2 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 NO 2 atmospheric pollution during daytime hours. The variability of in situ measurements of NO 2 concentration compared relatively well with space-based observations of the NO 2 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 NO 2 and temperature was not coherent. Relative humidity and solar radiation seemed to play a role in shaping the NO 2 concentration, regardless of the time of day, and these relationships were only partially interconnected.

Suggested Citation

  • Mirela Voiculescu & Daniel-Eduard Constantin & Simona Condurache-Bota & Valentina Călmuc & Adrian Roșu & Carmelia Mariana Dragomir Bălănică, 2020. "Role of Meteorological Parameters in the Diurnal and Seasonal Variation of NO 2 in a Romanian Urban Environment," IJERPH, MDPI, vol. 17(17), pages 1-15, August.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:17:p:6228-:d:404940
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    References listed on IDEAS

    as
    1. Spiru Paraschiv & Daniel-Eduard Constantin & Simona-Lizica Paraschiv & Mirela Voiculescu, 2017. "OMI and Ground-Based In-Situ Tropospheric Nitrogen Dioxide Observations over Several Important European Cities during 2005–2014," IJERPH, MDPI, vol. 14(11), pages 1-10, November.
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    Cited by:

    1. Rungruang Janta & Jenjira Kaewrat & Wittaya Tala & Surasak Sichum & Chuthamat Rattikansukha & K. H. Sameera M. Dharmadasa, 2023. "Human Health Risks and Interference of Urban Landscape and Meteorological Parameters in the Distribution of Pollutant: A Case Study of Nakhon Si Thammarat Province, Thailand," Sustainability, MDPI, vol. 15(20), pages 1-12, October.
    2. Adrian Roșu & Daniel-Eduard Constantin & Mirela Voiculescu & Maxim Arseni & Bogdan Roșu & Alexis Merlaud & Michel Van Roozendael & Puiu Lucian Georgescu, 2021. "Assessment of NO 2 Pollution Level during the COVID-19 Lockdown in a Romanian City," IJERPH, MDPI, vol. 18(2), pages 1-16, January.

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