Worldwide air quality from orbit: Sentinel-5P, absolute and year-on-year
The Copernicus Sentinel-5P mission maps the trace gases that define air quality from orbit — every day, everywhere. The measurement is only half the value; how you reference it decides whether you see signal or seasonal noise.
What Sentinel-5P sees
Nitrogen dioxide (NO₂) from traffic and combustion, sulphur dioxide (SO₂) from power and industry, carbon monoxide (CO), methane (CH₄), formaldehyde (HCHO) and aerosols. Together they show where pollution is produced and how it drifts.
Absolute reading, and change vs last year
EarthToDate delivers two complementary views. The absolute reading is the current concentration of each gas anywhere on Earth. The year-on-year delta compares it against a same-period baseline from the previous year — so seasonal cycles (heating demand, agricultural burning, monsoon) cancel out and genuine change stands out.
That framing turns the data into decisions. A factory coming online, a traffic rebound after a policy change, an industrial shutdown, or a multi-year emissions trend appears as a clear anomaly against its own baseline rather than as a number that could just be winter. It's objective, comparable air-quality intelligence with global coverage, daily refresh and no ground-sensor network required.