Zhaofeng Tan, Miao Feng, Hefan Liu, Yina Luo, Wei Li, Danlin Song, Qinwen Tan, Xuefei Ma, Keding Lu, Yuanhang Zhang
This study presents the measurement of photochemical precursors during the lockdown period from January 23, 2020, to March 14, 2020, in Chengdu in response to the coronavirus (COVID-19) pandemic. To derive the lockdown impact on air quality, the observations are compared to the equivalent periods in the last 2 years. An observation-based model is used to investigate the atmospheric oxidation capacity change during lockdown. OH, HO2 , and RO2 concentrations are simulated, which are elevated by 42, 220, and 277%, respectively, during the lockdown period, mainly due to the reduction in nitrogen oxides (NO x )...
May 11, 2024: Environmental Science & Technology