Dataset Information

Effects of Early Pollution Control Measures on Secondary Species of PM_2.5 in Jiaozuo, China.

ABSTRACT: Various measures for reducing air pollution have been promulgated since 2013 in China. To investigate the synergistic results of emission control and meteorological environment, PM_2.5 samples collected from October 2013 to July 2016 and November 2018 to October 2019 in Jiaozuo city were analyzed for their compositions, secondary species (Ss) variations, and factors changing for Ss formation. The results showed that the concentrations of sulfate, nitrate, ammonium, and secondary organic aerosols (SOAs) generally decreased over the same seasonal period during these years. In addition, the concentrations and proportions of each Ss increased with the increase in the PM_2.5 level in these years, implying that although PM_2.5 levels have been reduced by various control policies, Ss formation would remain the major contributor to PM elevations. The enhanced effects of gas-phase reactions on intensification of sulfate, SOA, and PM were observed in 2018-2019, which was consistent with the elevation of nitrate and SOA at PM levels of >150 ?g/m³. Only sulfate in all PM levels sharply decreased after 2015, showing the fine effect of coal-related pollution control and the importance of collaborative control of NO _x , volatile organic compounds, and organic aerosol emissions with SO₂ emissions in the future.

SUBMITTER: Tang J

PROVIDER: S-EPMC7818311 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

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Effects of Early Pollution Control Measures on Secondary Species of PM<sub>2.5</sub> in Jiaozuo, China.

Tang Junting J Song Dangyu D Ji Wanwan W Fan Liudan L

ACS omega 20210105 2

Various measures for reducing air pollution have been promulgated since 2013 in China. To investigate the synergistic results of emission control and meteorological environment, PM<sub>2.5</sub> samples collected from October 2013 to July 2016 and November 2018 to October 2019 in Jiaozuo city were analyzed for their compositions, secondary species (Ss) variations, and factors changing for Ss formation. The results showed that the concentrations of sulfate, nitrate, ammonium, and secondary organi ...[more]

PMID: 33490774

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Project description:The COVID-19 epidemic broke out in Wuhan, Hubei in December 2019 and in January 2020 and was later transmitted to the entire country. Quarantine measures during Chinese New Year effectively alleviated the spread of the epidemic, but they simultaneously resulted in a decline in anthropogenic emissions from industry, transportation, and import and export of goods. Herein, we present the major chemical composition of non-refractory PM2.5 (NR-PM2.5) and the concentrations of gaseous pollutants in an urban site in Shanghai before and during the quarantine period of the COVID-19 epidemic, which was Jan. 8-23 and Jan. 24-Feb. 8, respectively. The observed results show that the reduction in PM2.5 can be mainly attributed to decreasing concentrations of nitrate and primary aerosols. Nitrate accounted for 37% of NR-PM2.5 before the quarantine period when there was no emission reduction. During the quarantine period, the nitrate concentration decreased by approximately 60%, which is attributed to a reduction in the NOx concentration. Ammonium, as the main balancing cation, showed an approximately 45% simultaneous decrease in concentration. The concentrations of chloride and hydrocarbon-like organic aerosols from primary emissions also declined due to limited human activities. By contrast, sulphate and oxygenated organic aerosols showed a slight decrease in concentration, with their contributions increasing to 27% and 18%, respectively, during the quarantine period, which resulted in two pollution episodes with PM2.5 exceeding 100 μg/m3. This study provides a better understanding of the impact of quarantine measures on variations of the PM2.5 concentration and chemical compositions. Atmospheric oxidation capacities based on the oxidant (Ox = O3 + NO2) and oxidation ratios have been discussed for elucidating the source and formation of haze in an environment with lower anthropogenic emissions. With increasing contribution of secondary aerosols, lower NOx and nitrate concentrations did not completely avoid haze in Shanghai during the epidemic.

Dataset Information

Effects of Early Pollution Control Measures on Secondary Species of PM_2.5 in Jiaozuo, China.

Publications

Effects of Early Pollution Control Measures on Secondary Species of PM<sub>2.5</sub> in Jiaozuo, China.

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Dataset Information

Effects of Early Pollution Control Measures on Secondary Species of PM2.5 in Jiaozuo, China.

Publications

Effects of Early Pollution Control Measures on Secondary Species of PM<sub>2.5</sub> in Jiaozuo, China.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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Effects of Early Pollution Control Measures on Secondary Species of PM_2.5 in Jiaozuo, China.