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Deprecated: Implicit conversion from float 253.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Sci+Total+Environ 2021 ; 768 (ä): 144796 Nephropedia Template TP
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Enhanced atmospheric oxidation capacity and associated ozone increases during COVID-19 lockdown in the Yangtze River Delta #MMPMID33429116
Wang Y; Zhu S; Ma J; Shen J; Wang P; Wang P; Zhang H
Sci Total Environ 2021[May]; 768 (ä): 144796 PMID33429116show ga
Aggressive air pollution control in China since 2013 has achieved sharp decreases in fine particulate matter (PM(2.5)), along with increased ozone (O(3)) concentrations. Due to the pandemic of coronavirus disease 2019 (COVID-19), China imposed nationwide restriction, leading to large reductions in economic activities and associated emissions. In particular, large decreases were found in nitrogen oxides (NO(x)) emissions (>50%) from transportation. However, O(3) increased in the Yangtze River Delta (YRD), which cannot be fully explained by changes in NO(x) and volatile organic compound (VOCs) emissions. In this study, the Community Multi-scale Air Quality model was used to investigate O(3) increase in the YRD. Our results show a significant increase of atmospheric oxidation capacity (AOC) indicated by enhanced oxidants levels (up to +25%) especially in southern Jiangsu, Shanghai and northern Zhejiang, inducing the elevated O(3) during lockdown. Moreover, net P(HO(x)) of 0.4 to 1.6 ppb h(-1) during lockdown (Case 2) was larger than the case without lockdown (Case 1), mainly resulting in the enhanced AOC and higher O(3) production rate (+12%). This comprehensive analysis improves our understanding on AOC and associated O(3) formation, which helps to design effective strategies to control O(3).