Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Characteristic changes of ozone and its precursors in London during COVID-19 lockdown and the ozone surge reason analysis
https://orcid.org/0000-0002-5376-0949
Abstract The London COVID-19 lockdown reduced emissions from anthropogenic sources, providing unique conditions for air contamination research. This research uses tropospheric ozone (O3), volatile organic compounds (VOCs) and NOx (NO+NO2) hourly monitoring data at the London Marylebone Road station from 2001 to 2020 to investigate the effects of lockdown on (O3) and its precursors. Both NOx and VOCs pollution showed a decreasing trend between 2001 and 2021, with a gradual increase in O3 in contrast. During the COVID-19 lockdown period (from 23rd March to July 4, 2020), there was a surge in O3 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 O3 formation in urban London was in the VOC-limited regime. The rapid increase in O3 concentrations caused by the lockdown was closely related to the rapid decrease in NOx emissions.
Highlights Form 2001 to 2021, O3 concentrations increase by 0.3 ppb·yr-1, while other pollutants experience varying degrees of decline. During the COVID-19, NOx concentrations fall to 30% of the original levels, while O3 concentrations increase exponentially. Urban London O3 pollution is in the VOC-limited regime. The surge of O3 concentrations during the COVID-19 is because NOx declined rapidly.
Characteristic changes of ozone and its precursors in London during COVID-19 lockdown and the ozone surge reason analysis
https://orcid.org/0000-0002-5376-0949
Abstract The London COVID-19 lockdown reduced emissions from anthropogenic sources, providing unique conditions for air contamination research. This research uses tropospheric ozone (O3), volatile organic compounds (VOCs) and NOx (NO+NO2) hourly monitoring data at the London Marylebone Road station from 2001 to 2020 to investigate the effects of lockdown on (O3) and its precursors. Both NOx and VOCs pollution showed a decreasing trend between 2001 and 2021, with a gradual increase in O3 in contrast. During the COVID-19 lockdown period (from 23rd March to July 4, 2020), there was a surge in O3 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 O3 formation in urban London was in the VOC-limited regime. The rapid increase in O3 concentrations caused by the lockdown was closely related to the rapid decrease in NOx emissions.
Highlights Form 2001 to 2021, O3 concentrations increase by 0.3 ppb·yr-1, while other pollutants experience varying degrees of decline. During the COVID-19, NOx concentrations fall to 30% of the original levels, while O3 concentrations increase exponentially. Urban London O3 pollution is in the VOC-limited regime. The surge of O3 concentrations during the COVID-19 is because NOx declined rapidly.
Characteristic changes of ozone and its precursors in London during COVID-19 lockdown and the ozone surge reason analysis
https://orcid.org/0000-0002-5376-0949
Abstract The London COVID-19 lockdown reduced emissions from anthropogenic sources, providing unique conditions for air contamination research. This research uses tropospheric ozone (O3), volatile organic compounds (VOCs) and NOx (NO+NO2) hourly monitoring data at the London Marylebone Road station from 2001 to 2020 to investigate the effects of lockdown on (O3) and its precursors. Both NOx and VOCs pollution showed a decreasing trend between 2001 and 2021, with a gradual increase in O3 in contrast. During the COVID-19 lockdown period (from 23rd March to July 4, 2020), there was a surge in O3 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 O3 formation in urban London was in the VOC-limited regime. The rapid increase in O3 concentrations caused by the lockdown was closely related to the rapid decrease in NOx emissions.
Highlights Form 2001 to 2021, O3 concentrations increase by 0.3 ppb·yr-1, while other pollutants experience varying degrees of decline. During the COVID-19, NOx concentrations fall to 30% of the original levels, while O3 concentrations increase exponentially. Urban London O3 pollution is in the VOC-limited regime. The surge of O3 concentrations during the COVID-19 is because NOx declined rapidly.
Characteristic changes of ozone and its precursors in London during COVID-19 lockdown and the ozone surge reason analysis
Zhang, Chenyue (Autor:in) / Stevenson, David (Autor:in)
Atmospheric Environment ; 273
27.01.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
The dependence of tropospheric ozone production rate on ozone precursors
| Elsevier | 2004