Agency
EPA
Refresh cadence
hourly
Last successful sync
Pending first sync
Pipelines
aqi_sync
Category
Other
About this dataset
EPA AirNow AQI for ozone and particulate matter. Current-hour AQI observations for 23 US metropolitan sample points — 20 in the continental US plus Anchorage, Honolulu and San Juan — queried by latitude/longitude within a 50-mile radius, each with its pollutant, AQI value, category and the visibility impact we derive from it. Outside the continental US the published parameter set is thinner: the Alaska, Hawaii and Puerto Rico reporting areas carried particulate matter but no ozone when we measured AirNow on 2026-07-29. AI air-quality tool feeds high-altitude pilot oxygen guidance.
Where this feed reaches
- Continental United States
- Alaska
- Hawaii
- Puerto Rico and the US Virgin Islands
A region on this list means we fetch it. It is not a promise of station density: a listed region can still have sparse or no reporting sites near a given airport.
Where you'll see it in AeroCopilot
Upstream publisher
www.airnow.gov/AeroCopilot is the canonical pipeline for this dataset inside the product. The link above goes to the upstream publisher for full documentation and data licensing.