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Spatial and Temporal Characteristics of Environmental Air Quality and Its Relationship with Seasonal Climatic Conditions in Eastern China during 2015–2018

Author

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  • Zhiyuan Wang

    (College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China)

  • Xiaoyi Shi

    (College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China)

  • Chunhua Pan

    (College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China)

  • Sisi Wang

    (College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China)

Abstract

Exploring the relationship between environmental air quality (EAQ) and climatic conditions on a large scale can help better understand the main distribution characteristics and the mechanisms of EAQ in China, which is significant for the implementation of policies of joint prevention and control of regional air pollution. In this study, we used the concentrations of six conventional air pollutants, i.e., carbon monoxide (CO), sulfur dioxide (SO 2 ), nitrogen dioxide (NO 2 ), fine particulate matter (PM 2.5 ), coarse particulate matter (PM 10 ), and ozone (O 3 ), derived from about 1300 monitoring sites in eastern China (EC) from January 2015 to December 2018. Exploiting the grading concentration limit (GB3095-2012) of various pollutants in China, we also calculated the monthly average air quality index (AQI) in EC. The results show that, generally, the EAQ has improved in all seasons in EC from 2015 to 2018. In particular, the concentrations of conventional air pollutants, such as CO, SO 2 , and NO 2 , have been decreasing year by year. However, the concentrations of particulate matter, such as PM 2.5 and PM 10 , have changed little, and the O 3 concentration increased from 2015 to 2018. Empirical mode decomposition (EOF) was used to analyze the major patterns of AQI in EC. The first mode (EOF1) was characterized by a uniform structure in AQI over EC. These phenomena are due to the precipitation variability associated with the East Asian summer monsoon (EASM), referred to as the “summer–winter” pattern. The second EOF mode (EOF2) showed that the AQI over EC is a north–south dipole pattern, which is bound by the Qinling Mountains and Huaihe River (about 35° N). The EOF2 is mainly caused by seasonal variations of the mixed concentration of PM 2.5 and O 3 . Associated with EOF2, the Mongolia–Siberian High influences the AQI variation over northern EC by dominating the low-level winds (10 m and 850 hPa) in autumn and winter, and precipitation affects the AQI variation over southern EC in spring and summer.

Suggested Citation

  • Zhiyuan Wang & Xiaoyi Shi & Chunhua Pan & Sisi Wang, 2021. "Spatial and Temporal Characteristics of Environmental Air Quality and Its Relationship with Seasonal Climatic Conditions in Eastern China during 2015–2018," IJERPH, MDPI, vol. 18(9), pages 1-17, April.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:9:p:4524-:d:542629
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