Satellites see a worldwide decrease in nitrogen dioxide pollution as a result of the COVID-19 crisis, China shows first signs of economic recovery
The TROPOMI satellite instrument has detected decreases in nitrogen dioxide pollution worldwide during the lockdown. In some parts of China, nitrogen dioxide pollution seems to have increased again, rising even slightly higher than previous years.
Is the sky clearer and bluer since the start of the lockdown? Where does the colour of the sky comes from?
Reality is complex. Here are a few scientific facts about air pollution and air quality. Not all kinds of air pollution will decrease.
The lockdown of various cities in the Chinese province of Hubei has an impact on air quality, clearly perceptible from space.
Space-borne and ground-based instruments can detect such fires from space, as part of the Copernicus Earth Observation programme coordinated by the European Commission.
ICOS (Integrated Carbon Observation System) label for the Maïdo station on Reunion Island for BIRA-IASB.
Space-based measurements indicate that Central Africa is a global hotspot of formaldehyde (H2CO).