This app shows the average concentration of airborne Nitrogen Dioxide (NO2) over the last 30 days in comparison with the same period in the previous year. The NO2 is a gas that is emitted from combustion sources, therefore changes in NO2 could reflect the economic slowdown following the outbreak of coronavirus. The NO2 concentrations were retrieved by the European Copernicus Sentinel-5P satellite. Pixels with cloud fraction higher than 25% are removed from the analysis. The app is automatically updated when new observations are available.

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This is an example over China:


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