A retrospect of ozone formation mechanisms during the COVID-19 lockdown: The potential role of isoprene.

ABSTRACT: Wuhan took strict measures to prevent the spread of COVID-19 from January 26 to April 7 in 2020. The lockdown reduced the concentrations of atmospheric pollutants, except ozone (O₃). To investigate the increase in O₃ during the lockdown, trace gas pollutants were collected. The initial concentrations of volatile organic compounds (VOCs) were calculated based on a photochemical ratio method, and the ozone formation potential (OFP) was obtained using the initial and measured VOC concentrations. The O₃ formation regime was NO_X-limited based on the VOCs/NO_X diurnal ratios during the lockdown period. The reduced nitric oxide (NO) concentrations and lower wind speed (WS) could explain the night-time O₃ accumulation. The initial to

SUBMITTER: Xu K 

PROVIDER: S-EPMC9679402 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature