IQAir AirVisual
FreemiumLiveLast verified 24 Sept 2026
Current US and China AQI plus weather for the nearest city by GPS, IP or name, from hourly station readings.
Example request
curl "https://api.airvisual.com/v2/nearest_city?lat=34.05&lon=-118.24&key=$API_KEY"
Free tier, in plain English
A free Community key gives city-level AQI and current weather, capped at 500 calls a day. Station-level pollutant data and forecasts need a paid plan.
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.FreeLuchtmeetnetReal-time and forecast air quality measurements from Dutch government monitoring stations.FreeOpenAQAggregated PM2.5, NO2, O3 and other pollutant readings from ground monitoring stations worldwide.Freemium