Topic 5b: Part 2 - Effects on NO₂ - Part 2
Though we can estimate changes in Nitrogen Dioxide (NO₂) in the atmosphere from Space using satellites, they can not tell us about the sources and why the change occured. The decrease in traffic and industrial activity, the two main sources of nitrogen dioxide (NO₂) in urban areas, led to unprecedented decreases in NO₂ pollution, as evidenced by daily global scale space-borne NO₂ observations from the TROPOMI instrument on board ESA Sentinel-5 Precursor satellite.
In this topic Dr Andreas Richter explains how we can infer what changes in NO₂ were related to COVID-19 lockdowns.
Featured Educator
- Dr Andreas Richter, Senior Scientist, University of Bremen
Thanks to all of the contributing scientists for self-filming during the COVID-19 lockdown.
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Featured Images and Example Data
Air pollution in Europe returning to pre-pandemic levels in March 2021
This image shows the average concentrations of nitrogen dioxide (NO₂) in the tropospheric column (i.e. above ground level), computed using Copernicus Sentinel-5P satellite data for March of 2019, 2020 and 2021.
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Copernicus
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NO2 concentrations over India 2020
These images, using data from the Copernicus Sentinel-5P satellite, show the average nitrogen dioxide concentrations from 1 January to 24 March 2020 and 25 March (the first day of the lockdown) to 20 April 2020.
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contains modified Copernicus Sentinel data (2019-20), processed by ESA
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Airborne Nitrogen Dioxide Plummets Over China
Airbourne nitrogen dioxide concentrations over China in January 2020 (left) and February 2020 (right) measured by Sentinel-5p
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NASA Earth Observatory images by Joshua Stevens, using modified Copernicus Sentinel 5P data processed by the European Space Agency
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Nitrogen dioxide concentrations over China 2019/20/21
These images, using data from the Copernicus Sentinel-5P satellite, show the monthly average nitrogen dioxide concentrations over China in February 2019, February 2020 and February 2021.
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contains modified Copernicus Sentinel data (2019-21), processed by ESA
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Sentinel-5p Animation
Sentinel-5 Precursor – also known as Sentinel-5P – is the first Copernicus mission dedicated to monitoring our atmosphere.
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ESA/ATG medialab
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Coronavirus: nitrogen dioxide emissions drop over Italy
Data from the Copernicus Sentinel-5P satellite reveal the decline of air pollution, specifically nitrogen dioxide emissions, over Italy.
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ESA
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NOx emissions decline in European lockdowns 2020 Vs business as usual
Animation of the absolute cumulative NOx emission decline in 2020 as compared to the business-as-usual scenario, still 10 April 2020
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Copernicus Atmosphere Monitoring Service/ECMWF/BSC
Source LinkDownload Resources
NOx Emissions Reduction and Rebound in China Due to the COVID‐19 Crisis
Research article in Geophysical Research Letters
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