Public Dataset

EPA AirNow Air Quality

The EPA AirNow API provides real-time and forecast air quality data across the United States, Canada, and Mexico from over 2,500 monitoring stations. Data includes AQI values for PM2.5, PM10, ozone, CO, NO2, and SO2 along with health category ratings. Forecasts cover more than 500 cities. Rate limited to 500 requests per hour with a free API key.

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What You Can Query

You can check current air quality observations by ZIP code or coordinates (observation/current), retrieve historical AQI data for any past date (observation/historical), and get air quality forecasts for upcoming days (forecast endpoint).

What You Can Do

Monitoring current air quality conditions by ZIP code or city

Checking AQI forecasts for outdoor event planning

Analyzing historical air quality trends during wildfire seasons

Comparing PM2.5 and ozone levels across metropolitan areas

Building health advisory tools based on real-time AQI data

Assessing air quality impacts for real estate and urban planning

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