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dc.contributor.authorVenter, Alexander Samuel
dc.contributor.authorAunan, Kristin
dc.contributor.authorChowdhury, Sourangsu
dc.contributor.authorLelieveld, Jos
dc.description.abstractThe lockdown response to coronavirus disease 2019 (COVID-19) has caused an unprecedented reduction in global economic and transport activity. We test the hypothesis that this has reduced tropospheric and ground-level air pollution concentrations, using satellite data and a network of >10,000 air quality stations. After accounting for the effects of meteorological variability, we find declines in the population-weighted concentration of ground-level nitrogen dioxide (NO2: 60% with 95% CI 48 to 72%), and fine particulate matter (PM2.5: 31%; 95% CI: 17 to 45%), with marginal increases in ozone (O3: 4%; 95% CI: −2 to 10%) in 34 countries during lockdown dates up until 15 May. Except for ozone, satellite measurements of the troposphere indicate much smaller reductions, highlighting the spatial variability of pollutant anomalies attributable to complex NOx chemistry and long-distance transport of fine particulate matter with a diameter less than 2.5 μm (PM2.5). By leveraging Google and Apple mobility data, we find empirical evidence for a link between global vehicle transportation declines and the reduction of ambient NO2 exposure. While the state of global lockdown is not sustainable, these findings allude to the potential for mitigating public health risk by reducing “business as usual” air pollutant emissions from economic activitiesen_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.subjectair qualityen_US
dc.subjectCOVID-19 confinementen_US
dc.subjectnitrogen dioxideen_US
dc.subjectparticulate matteren_US
dc.titleCOVID-19 lockdowns cause global air pollution declinesen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holderThe author(s) retains copyright to individual PNAS articlesen_US
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400::Kjemi: 440::Miljøkjemi, naturmiljøkjemi: 446en_US
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430en_US
dc.subject.nsiVDP::Samfunnsvitenskap: 200::Samfunnsgeografi: 290en_US
dc.source.journalProceedings of the National Academy of Sciences of the United States of Americaen_US

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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal