2021
DOI: 10.5194/acp-2021-1028
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Tropospheric ozone production and chemical regime analysis during the COVID-19 lockdown over Europe

Abstract: Abstract. The COVID-19 (Coronavirus disease 2019) European lockdowns have lead to a significant reduction in the emissions of primary pollutants such as NO (nitric oxide) and NO2 (nitrogen dioxide). As most photochemical processes are related to nitrogen oxide (NOx ≡ NO + NO2) chemistry, this event has presented an exceptional opportunity to investigate its effects on air quality and secondary pollutants, such as tropospheric ozone (O3). In this study, we present the effects of the COVID-19 lockdown on atmosph… Show more

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“…This has been shown by modelling and in situ observational studies, both in China and Europe (e.g. Le et al, 2020;Shi and Brasseur, 2020;Giani et al, 2020;Souri et al, 2021;Mertens et al, 2021;Nussbaumer et al, 2021). Ozone decreased in rural areas, where photochemical production of ozone is controlled by the abundance of nitrogen oxides (thus a NO x -limited regime), the concentrations of which clearly decreased during the pandemic lockdown.…”
Section: Introductionmentioning
confidence: 76%
“…This has been shown by modelling and in situ observational studies, both in China and Europe (e.g. Le et al, 2020;Shi and Brasseur, 2020;Giani et al, 2020;Souri et al, 2021;Mertens et al, 2021;Nussbaumer et al, 2021). Ozone decreased in rural areas, where photochemical production of ozone is controlled by the abundance of nitrogen oxides (thus a NO x -limited regime), the concentrations of which clearly decreased during the pandemic lockdown.…”
Section: Introductionmentioning
confidence: 76%