OpenAQ
FreemiumLiveLast verified 24 Sept 2026
Aggregated PM2.5, NO2, O3 and other pollutant readings from ground monitoring stations worldwide.
Example request
curl --request GET --url 'https://api.openaq.org/v3/locations/2178' --header 'X-API-Key: $API_KEY' --header 'User-Agent: WildAPIsResearch/0.1 (+https://wildapis.com)'
Free tier, in plain English
Free with a registered key, capped at 60 calls a minute and 2,000 an hour; heavier use needs a separate paid arrangement.
Alternatives in Air Quality
AirNowHourly AQI observations and daily air quality forecasts for the US, Canada and Mexico by zip or coordinate.FreeAQICN (World Air Quality Index)Real-time air quality index, pollutant levels, and forecasts from 11,000+ global monitoring stations.FreeEPAUS EPA Air Quality System: ambient air monitor readings by site, county, or state.FreeIQAir AirVisualCurrent US and China AQI plus weather for the nearest city by GPS, IP or name, from hourly station readingsFreemiumLuchtmeetnetReal-time and forecast air quality measurements from Dutch government monitoring stations.Free