Air Monitoring

The Air Monitoring Division provides an accurate and timely representation of the ambient air quality within Maricopa County. In cooperation with the United States Environmental Protection Agency (EPA) and other governmental agencies, the Division operates 24 air quality monitoring sites and conducts additional monitoring activities to measure pollutants, including:

  • Carbon Monoxide
  • Lead
  • Nitrogen Dioxide
  • Ozone
  • Particulates Matter (PM10 and PM2.5)
  • Sulfur Dioxide

The data produced are used in a variety of different ways, including: the ability to determine attainment status with the Clean Air Act, modeling for new sources, and providing  information needed by the Arizona of Environmental Quality forecasters.

Monitoring Data


The Maricopa County Air Monitoring Division offers enhanced data from the monitoring network including:
  • Air Quality Index ratings
  • Five-minute updates for PM10 and hourly updates for remaining criteria pollutants
  • Real-time meteorology
  • National Weather Service radar
  • Satellite imagery
A map image of the air quality monitoring site locations around Maricopa County

Rapid Response Notification System


You can help to maintain compliance with air quality standards by signing up for notification of a Rapid Response event.

When dust pollution levels begin to rise, the Maricopa County Air Quality Department will send you a message notifying you of where the pollution hot spot is and what steps you will need to do to help prevent an exceedance of the health standard.

For more information, view the Rapid Response Notifications page.
Page reviewed May 8, 2019