Air Quality
Every listing carries the same fields in the same order. Counts beside each filter update as you narrow.
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
AirNowHourly AQI observations and daily air quality forecasts for the US, Canada and Mexico by zip or coordinate. Weather & Environment › Air Quality | Free | API key | JSON | — | Live |
AQICN (World Air Quality Index)Real-time air quality index, pollutant levels, and forecasts from 11,000+ global monitoring stations. Weather & Environment › Air Quality | Free | API key | JSON | 10k+/day | Live |
EPAUS EPA Air Quality System: ambient air monitor readings by site, county, or state. Weather & Environment › Air Quality | Free | API key | JSON | 10k+/day | Live |
IQAir AirVisualCurrent US and China AQI plus weather for the nearest city by GPS, IP or name, from hourly station readings Weather & Environment › Air Quality | Freemium | API key | JSON | 100–1k/day | Live |
LuchtmeetnetReal-time and forecast air quality measurements from Dutch government monitoring stations. Weather & Environment › Air Quality | Free | None | JSON | 10k+/day | Live |
OpenAQAggregated PM2.5, NO2, O3 and other pollutant readings from ground monitoring stations worldwide. Weather & Environment › Air Quality | Freemium | API key | JSON | 10k+/day | Live |
PurpleAirLive and historical PM2.5, temperature and humidity from community sensors, by sensor or bounding box. Weather & Environment › Air Quality | Free trial | API key | JSON | — | Live |
AirNowFreeLive
Hourly AQI observations and daily air quality forecasts for the US, Canada and Mexico by zip or coordinate.
API key · JSON
—
no machine-readable spec
AQICN (World Air Quality Index)FreeLive
Real-time air quality index, pollutant levels, and forecasts from 11,000+ global monitoring stations.
API key · JSON
10k+/day
no machine-readable spec
EPAFreeLive
US EPA Air Quality System: ambient air monitor readings by site, county, or state.
API key · JSON
10k+/day
OpenAPI spec
IQAir AirVisualFreemiumLive
Current US and China AQI plus weather for the nearest city by GPS, IP or name, from hourly station readings
API key · JSON
100–1k/day
no machine-readable spec
LuchtmeetnetFreeLive
Real-time and forecast air quality measurements from Dutch government monitoring stations.
None · JSON
10k+/day
no machine-readable spec
OpenAQFreemiumLive
Aggregated PM2.5, NO2, O3 and other pollutant readings from ground monitoring stations worldwide.
API key · JSON
10k+/day
no machine-readable spec
PurpleAirFree trialLive
Live and historical PM2.5, temperature and humidity from community sensors, by sensor or bounding box.
API key · JSON
—
no machine-readable spec
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