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EPA AirNow (Air Quality Index)

EPA AirNow AQI for ozone and particulate matter.

Agency

EPA

Update cadence

Hourly

Category

Other

What we ingest

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.

Where this feed reaches

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 a feed does not reach a region at all, this page says so instead of showing an empty panel.

  • Continental United States
  • Alaska
  • Hawaii
  • Puerto Rico and the US Virgin Islands

How AeroCopilot uses it

AI air-quality tool feeds high-altitude pilot oxygen guidance.

Powers these features

The product surfaces below depend on this feed.

AI Copilot

Upstream source: https://www.airnow.gov/

Cite this

Permalink

AeroCopilot — EPA AirNow (Air Quality Index). Data: EPA (https://www.airnow.gov/). https://www.aerocopilot.ai/data-sources/air-quality.

Try the AI Copilot with this data

The Copilot has live access to EPA AirNow (Air Quality Index) during every conversation.