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Open AccessArticle

Characteristics, Secondary Formation and Regional Contributions of PM2.5 Pollution in Jinan during Winter

1
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
2
Jinan Eco-environmental Monitoring Center of Shandong Province, Jinan 250000, China
*
Authors to whom correspondence should be addressed.
Atmosphere 2020, 11(3), 273; https://doi.org/10.3390/atmos11030273
Received: 9 February 2020 / Revised: 3 March 2020 / Accepted: 4 March 2020 / Published: 10 March 2020
(This article belongs to the Special Issue Future Energy Technologies and Photochemical Smog Formation)
Air pollution is an increasing threat to human health in China. In this study, daily PM10 and PM2.5 samples were collected simultaneously at the Jinan Environmental Monitoring Station (EMS)in Jinan, China from 15 November 2016 to 15 March 2017. The aim of this work was to improve the understanding of the characteristics and sources of air particles and determine different levels of PM2.5 pollution and its constituent elements, water-soluble ions and carbonaceous species. Nitrate (NO3), organic materials (OM) and sulfate (SO42−) were identified as the three main components of PM2.5 pollution. With increasing pollution level, the contributions of SO42−, NO3 and NH4+ increased at greater rates, unlike that of OM. The proportion of SO42− exceeded that of NO3 and became predominant in severe PM2.5 pollution (SP; 250 μg m−3 ≤ PM2.5 ≤ 500 μg m−3). This work demonstrates that SO42− has a dominant role in SP level and, consequently, requires greater research attention. It is demonstrated that relative humidity (RH) enhances the rate of sulfate formation more than that of nitrate. Therefore, under the current Chinese emergency response measures, it is necessary to further reduce emissions of SO2 and NO2. Four clusters of backward trajectories identified dominant pollution vectors originating from highly industrialized areas that exacerbate the poor air quality in Jinan. It is, therefore, necessary to undertake regional control measures to reduce pollutant emissions. View Full-Text
Keywords: PM2.5; SO42−; RH; sulfate formation; regional transport PM2.5; SO42−; RH; sulfate formation; regional transport
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Liu, Y.; Wang, J.; Zhao, X.; Wang, J.; Wang, X.; Hou, L.; Yang, W.; Han, B.; Bai, Z. Characteristics, Secondary Formation and Regional Contributions of PM2.5 Pollution in Jinan during Winter. Atmosphere 2020, 11, 273.

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