Next Article in Journal
Association of Cardiovascular Disease and Long-Term Exposure to Fine Particulate Matter (PM2.5) in the Southeastern United States
Next Article in Special Issue
Air Quality in the Italian Northwestern Alps during Year 2020: Assessment of the COVID-19 «Lockdown Effect» from Multi-Technique Observations and Models
Previous Article in Journal
Reconciling Reduced Red Meat Consumption in Canada with Regenerative Grazing: Implications for GHG Emissions, Protein Supply and Land Use
Previous Article in Special Issue
Changes in Air Quality Associated with Mobility Trends and Meteorological Conditions during COVID-19 Lockdown in Northern England, UK
 
 
Article

Atmospheric Impacts of COVID-19 on NOx and VOC Levels over China Based on TROPOMI and IASI Satellite Data and Modeling

1
Royal Belgian Institute for Space Aeronomy (BIRA-IASB), 1180 Brussels, Belgium
2
Observatoire Midi-Pyrénées, 31400 Toulouse, France
3
Laboratoire d’Aérologie, CNRS, Université de Toulouse, 31013 Toulouse, France
4
NOAA/Chemical Sciences Laboratory/CIRES, University of Colorado, Boulder, CO 80221, USA
5
Université libre de Bruxelles (ULB), Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Brussels 1050, Belgium
6
LATMOS/IPSL, Sorbonne Université, UVSQ, CNRS, 75006 Paris, France
7
School of Atmosphere Science, Sun Yat-sen University, Zhuhai 510275, China
8
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China
9
Max Planck Institute for Meteorology, 20146 Hamburg, Germany
10
National Center for Atmospheric Research, Boulder, CO 80301, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Mihalis Vrekoussis and Maria Kanakidou
Atmosphere 2021, 12(8), 946; https://doi.org/10.3390/atmos12080946
Received: 15 June 2021 / Revised: 12 July 2021 / Accepted: 21 July 2021 / Published: 23 July 2021
China was the first country to undergo large-scale lockdowns in response to the pandemic in early 2020 and a progressive return to normalization after April 2020. Spaceborne observations of atmospheric nitrogen dioxide (NO2) and oxygenated volatile organic compounds (OVOCs), including formaldehyde (HCHO), glyoxal (CHOCHO), and peroxyacetyl nitrate (PAN), reveal important changes over China in 2020, relative to 2019, in response to the pandemic-induced shutdown and the subsequent drop in pollutant emissions. In February, at the peak of the shutdown, the observed declines in OVOC levels were generally weaker (less than 20%) compared to the observed NO2 reductions (−40%). In May 2020, the observations reveal moderate decreases in NO2 (−15%) and PAN (−21%), small changes in CHOCHO (−3%) and HCHO (6%). Model simulations using the regional model MAGRITTEv1.1 with anthropogenic emissions accounting for the reductions due to the pandemic explain to a large extent the observed changes in lockdown-affected regions. The model results suggest that meteorological variability accounts for a minor but non-negligible part (~−5%) of the observed changes for NO2, whereas it is negligible for CHOCHO but plays a more substantial role for HCHO and PAN, especially in May. The interannual variability of biogenic and biomass burning emissions also contribute to the observed variations, explaining e.g., the important column increases of NO2 and OVOCs in February 2020, relative to 2019. These changes are well captured by the model simulations. View Full-Text
Keywords: COVID-19; nitrogen dioxide; volatile organic compounds; formaldehyde; anthropogenic emissions; atmospheric modeling COVID-19; nitrogen dioxide; volatile organic compounds; formaldehyde; anthropogenic emissions; atmospheric modeling
Show Figures

Figure 1

MDPI and ACS Style

Stavrakou, T.; Müller, J.-F.; Bauwens, M.; Doumbia, T.; Elguindi, N.; Darras, S.; Granier, C.; Smedt, I.D.; Lerot, C.; Van Roozendael, M.; Franco, B.; Clarisse, L.; Clerbaux, C.; Coheur, P.-F.; Liu, Y.; Wang, T.; Shi, X.; Gaubert, B.; Tilmes, S.; Brasseur, G. Atmospheric Impacts of COVID-19 on NOx and VOC Levels over China Based on TROPOMI and IASI Satellite Data and Modeling. Atmosphere 2021, 12, 946. https://doi.org/10.3390/atmos12080946

AMA Style

Stavrakou T, Müller J-F, Bauwens M, Doumbia T, Elguindi N, Darras S, Granier C, Smedt ID, Lerot C, Van Roozendael M, Franco B, Clarisse L, Clerbaux C, Coheur P-F, Liu Y, Wang T, Shi X, Gaubert B, Tilmes S, Brasseur G. Atmospheric Impacts of COVID-19 on NOx and VOC Levels over China Based on TROPOMI and IASI Satellite Data and Modeling. Atmosphere. 2021; 12(8):946. https://doi.org/10.3390/atmos12080946

Chicago/Turabian Style

Stavrakou, Trissevgeni, Jean-François Müller, Maite Bauwens, Thierno Doumbia, Nellie Elguindi, Sabine Darras, Claire Granier, Isabelle De Smedt, Christophe Lerot, Michel Van Roozendael, Bruno Franco, Lieven Clarisse, Cathy Clerbaux, Pierre-François Coheur, Yiming Liu, Tao Wang, Xiaoqin Shi, Benjamin Gaubert, Simone Tilmes, and Guy Brasseur. 2021. "Atmospheric Impacts of COVID-19 on NOx and VOC Levels over China Based on TROPOMI and IASI Satellite Data and Modeling" Atmosphere 12, no. 8: 946. https://doi.org/10.3390/atmos12080946

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop