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Atmos Environ (1994)

Title:		Characteristic changes of ozone and its precursors in London during COVID-19 lockdown and the ozone surge reason analysis
Author(s):		Zhang C; Stevenson D;
Address:		"School of Geosciences, The University of Edinburgh, Edinburgh, EH9 3FF, United Kingdom. College of Urban and Environmental Sciences, Northwest University, Xi'an, Shaanxi Province, 710127, China"
Journal Title:		Atmos Environ (1994)
Year:		2022
Volume:		20220204
Issue:
Page Number:		118980 -
DOI:		10.1016/j.atmosenv.2022.118980
ISSN/ISBN:		1352-2310 (Print) 1352-2310 (Electronic) 1352-2310 (Linking)
Abstract:		"The London COVID-19 lockdown reduced emissions from anthropogenic sources, providing unique conditions for air contamination research. This research uses tropospheric ozone (O(3)), volatile organic compounds (VOCs) and NOx (NO+NO(2)) hourly monitoring data at the London Marylebone Road station from 2001 to 2020 to investigate the effects of lockdown on (O(3)) and its precursors. Both NOx and VOCs pollution showed a decreasing trend between 2001 and 2021, with a gradual increase in O(3) in contrast. During the COVID-19 lockdown period (from 23rd March to July 4, 2020), there was a surge in O(3) concentration, accompanied by a sharp reduction in NOx concentrations. Because all the monitoring VOCs/NOx results were less than eight during the lockdown, indicating that O(3) formation in urban London was in the VOC-limited regime. The rapid increase in O(3) concentrations caused by the lockdown was closely related to the rapid decrease in NOx emissions"
Keywords:		COVID-19 lockdown Sensitivity analysis VOC-Limited regime;
Notes:		"PubMed-not-MEDLINEZhang, Chenyue Stevenson, David eng England 2022/02/10 Atmos Environ (1994). 2022 Mar 15; 273:118980. doi: 10.1016/j.atmosenv.2022.118980. Epub 2022 Feb 4"