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 is used in a variety of different ways, including determining attainment status with the Clean Air Act, modeling for new sources, and providing information to the Arizona Department of Environmental Quality (ADEQ) forecasters. Beyond operating the air monitoring network, the division conducts additional air monitoring activities and scientific studies such as:

  • Testing newly emerging air monitoring technologies such as "low-cost" small air quality sensors.
  • Determining the geographic distribution of pollution.
  • Assisting the Compliance and Enforcement division with investigating air quality concerns by monitoring for the presence of airborne pollutants.

Monitoring Data


The division offers enhanced data from the monitoring network to include:
  • 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

Current Air Quality Status Map

Air Quality Status Map

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 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 30 May 2019