Articles | Volume 21, issue 3
Atmos. Chem. Phys., 21, 1759–1774, 2021
https://doi.org/10.5194/acp-21-1759-2021
Atmos. Chem. Phys., 21, 1759–1774, 2021
https://doi.org/10.5194/acp-21-1759-2021

Research article 09 Feb 2021

Research article | 09 Feb 2021

Sudden changes in nitrogen dioxide emissions over Greece due to lockdown after the outbreak of COVID-19

Maria-Elissavet Koukouli et al.

Data sets

Air quality measurements from in situ monitoring stations European Environment Agency (EEA) https://discomap.eea.europa.eu/map/fme/AirQualityExport.htm

Air quality measurements from in situ monitoring stations Greek Ministry of the Environment https://ypen.gov.gr/perivallon/poiotita-tis-atmosfairas/dedomena-metriseon-atmosfairikis-rypansis/

Sentinel-5P MPC Validation Server, NO2 tropospheric column OFFL vs MAXDOAS MPC ESA https://mpc-vdaf-server.tropomi.eu/no2/no2-offl-maxdoas/athens

EarthData Giovanni repository NASA https://giovanni.gsfc.nasa.gov/giovanni/

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Short summary
In recent years, satellite observations have contributed to monitoring air quality. During the first COVID-19 lockdown, lower levels of nitrogen dioxide were observed over Greece by S5P/TROPOMI for March and April 2020 (than the preceding year) due to decreased transport emissions. Taking meteorology into account, using LOTOS-EUROS CTM simulations, the resulting decline due to the lockdown was estimated to range between 0 % and −37 % for the five largest Greek cities, with an average of ~ −10 %.
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