Air Quality (PM2.5)

atmosphereECV · GCOS Tier 1composition
Surface-level mass concentration of particulate matter with diameter ≤ 2.5 micrometers. Drives health impacts from wildfire smoke, industrial emissions, and secondary aerosol formation. Operationally forecast by NOAA HRRR-Smoke (MASSDEN at 8 m AGL) and observed by EPA AirNow / PurpleAir.
Canonical units: kg m-3
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