Articles | Volume 22, issue 22
https://doi.org/10.5194/acp-22-15035-2022
https://doi.org/10.5194/acp-22-15035-2022
Research article
 | 
25 Nov 2022
Research article |  | 25 Nov 2022

Diagnosing ozone–NOx–VOC sensitivity and revealing causes of ozone increases in China based on 2013–2021 satellite retrievals

Jie Ren, Fangfang Guo, and Shaodong Xie

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Cited articles

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Chinese State Council: Three-year action plan on defending the blue Sky: http://www.gov.cn/zhengce/content/2018-07/03/content_5303158.htm, (last accessed: 7 March 2022), 2018 (in Chinese). 
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Short summary
O3–NOx–VOC sensitivity in China is diagnosed by deriving regional satellite HCHO / NO2 thresholds between O3 production regimes. VOC-limited regimes are found widely over megacity clusters and developed cities. VOCs and NOx emissions are tracked with satellite HCHO and NO2 to evaluate O3 responses to precursors changes. The significant reduction in NOx emissions without effective VOC control since the Clean Air Action Plan in 2013 is responsible for the increase in O3 concentrations in China.
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