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 air quality monitoring sites and a mobile air monitoring program to measure pollutants, including:

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

The data from these sites 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 data to Air Quality Forecaster.

Monitoring Data


Maricopa County Air Monitoring Division offers enhanced data from the monitoring network including:
  • Air Quality Index ratings
  • Hourly updates for remaining criteria pollutants
  • National Weather Service radar
  • Real-time meteorology
  • Real-time updates for PM10
  • 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.