Shifts of Formation Regimes and Increases of Atmospheric Oxidation Led to Ozone Increase in North China Plain and Yangtze River Delta From 2016 to 2019

Abstract

Air pollution poses a great threat to public health and ecological systems in China, especially in the North China Plain (NCP) and Yangtze River Delta (YRD) Zhang, Xue, et al., 2021). Specifically, PM 2.5 (fine particulate matter with an aerodynamic diameter less than 2.5 μm) and O 3 were associated with ∼630,000 and ∼300,000 annual premature deaths in China from 2010 to 2015, respectively (Malley et al., 2017;G. Zhu et al., 2019), and induced severe damage to crop yields (Zhang, Yue, et al., 2021). Aiming to improve air quality and protect public health, the Chinese government has implemented strict pollutant control policies with respect to two stages of the "Air Pollution Prevention and Control Action Plan" (2013-2017) and the Three-Year Action Plan for Winning the Blue Sky Defense Battle (2018)(2019)(2020). Previous studies reported the anthropogenic emissions of SO 2 , NO x , and PM 2.5 decreased by 59%,

Unexpected Trade-Offs of Fossil Fuel Reduction on PM2.5 and O3 Pollution Regulation Can Be Offset by Synergistic Control of VOCs Source

“…Previous studies reported that atmospheric oxidation capacity (AOC) was a better indicator to characterize the synergy capacity of the chemical reactions leading to PM 2.5 and O 3 formation. , Hence, we estimated the diel variation of AOC in three pollution types as shown in Figure b–e. The average total AOC (T-AOC) during the O 3 pollution period (2.7 × 10 7 molecules cm –3 s –1 ) is higher than the average T-AOC in China (2.2 × 10 7 molecules cm –3 s –1 ), indicating the highly oxidative environment.…”