How much NO₂ sits in the air column below the stratosphere. Because NO₂ survives only hours, bright areas mark active combustion right now — motorway networks, power stations, shipping lanes and dense cities all draw themselves.
TROPOMI · Sentinel-5P · daily
75%
Fri, 28 Aug 2026Latest
Sentinel-5P data lags about 2 days, so Fri, 28 Aug 2026 is the newest frame.