PRESS RELEASE | ADEQ Issues PM-10 High Pollution Advisory for Maricopa County Effective June 28 & 29, 2021

ADEQ is issuing a High Pollution Advisory (HPA) for coarse particulate matter (PM10) effective June 28 & 29, 2021, in Maricopa County. PM10 is made up of small particles found in dust. ADEQ recommends that people limit outdoor activity while the HPA is in effect, especially children and adults with respiratory problems.

Health Impacts

People most vulnerable to the impacts of air pollution include children, older adults, adults exercising outdoors, people with heart or lung disease, and those suffering from asthma and bronchitis. Exposure can increase the number and severity of asthma attacks, cause or aggravate bronchitis or other lung disease, and reduce the body’s ability to fight infection. Symptoms may include itchy eyes, nose and throat, wheezing, coughing, shortness of breath, chest pain and upper respiratory issues. Long-term exposure is linked to premature death in people with heart or lung disease, nonfatal heart attacks, irregular heartbeat and decreased lung function.

Please help reduce PM10 by doing one or more of the following:

  • Avoid dirt roads
  • Avoid the use of leaf blowers
  • Ride transit, carpool or telework
  • Eliminate all unnecessary driving and/or combine trips


High Pollution Advisory (HPA): Notifies the public that the level of an air pollutant is forecast to exceed the federal health standard.

High Pollution Watch (HPW): Notifies the public when there is potential for a pollutant to exceed the federal health standard.

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Arizona Department of Environmental Quality (ADEQ): Provides hourly forecasts for air quality in certain areas of the state and issues HPAs or HPWs when the appropriate conditions exist.

Public Information Officer | 602-540-8072 | Email >

Maricopa County Air Quality Department (MCAQD): Regulatory agency for air quality in Maricopa County | View MCAQD Website >

Public Information Officer | 602-506-6713 (office) | 602-526-7307 (cell)

Valley Metro: Eco-friendly public transit options to residents of greater Phoenix and Maricopa County | View Valley Metro Website >

Communications Manager | 602-523-6004 | Email >