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Nitrogen dioxide levels over San Francisco Bay: past five-year average (L) and March 2020 (R).
Nitrogen dioxide, an air pollutant, decreased significantly over urban areas during the pandemic. The left image above shows average NO2 levels over San Francisco for the past five years, and the right image shows NO2 levels in March 2020. Data from NASA's Ozone Monitoring Instrument / NASA Covid-19 Dashboard.
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