AirNow API - Web Services

Forecasts

Current Forecasts

By Reporting Area, Lat/Long, or Zip Code

Get current forecast AQI values and categories by reporting area, lat/long, or zip code.

Historical Forecasts

By Reporting Area

Get historical forecast AQI values and categories by reporting area.

Contour Maps

By geographic bounding box - PM2.5

Get current or historical PM2.5 contour maps in KML.

By geographic bounding box - ozone

Get current or historical ozone contour maps in KML.

By geographic bounding box - combined ozone and PM2.5

Get current or historical contour maps in KML for combined ozone and PM2.5 values.

Observations by Monitoring Site

By hourly data geographic bounding box

Get AQI values or data concentrations for a specified date and time range and set of parameters within a geographic area of interest.

By daily data geographic bounding box

Get daily AQI values or data concentrations for a specified date and set of parameters within a geographic area of interest.

Current Observations

By Reporting Area

Get current AQI values and categories for a reporting area by reporting area code.

By Zip Code or Lat/Long

Get current AQI values and categories for a reporting area by zip code or by latitude and longitude.

Historical Observations by Reporting Area

By State

Get historical AQI values and categories for reporting areas by state.

Web Services that will be retired in the fall of 2026

Forecasts

By Zip Code

Get current or historical forecasted AQI values and categories for a reporting area by zip code.

By latitude/longitude

Get current or historical forecasted AQI values and categories for a reporting area by latitude and longitude.

Current Observations by Reporting Area

By Zip Code

Get current AQI values and categories for a reporting area by zip code.

By latitude/longitude

Get current AQI values and categories for a reporting area by latitude and longitude.

Historical Observations by Reporting Area

By Zip Code

Get historical AQI values and categories for a reporting area by zip code.

By latitude/longitude

Get historical AQI values and categories for a reporting area by latitude and longitude.