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The original item was published from 7/9/2018 1:31:01 PM to 7/11/2018 12:00:00 AM.

News Flash

Air Quality

Posted on: July 9, 2018

[ARCHIVED] Same Day PM-10/PM-2.5 HPA issued July 9 and PM-10 HPA issued July 10

HPA logo

The Arizona Department of Environmental Quality (ADEQ) is issuing a Same Day PM10 (dust) / PM2.5 (smoke) High Pollution Advisory (HPA) for Monday, July 9 and a PM-10 HPA for Tuesday, July 10, 2018. These HPAs are due to particle pollutant levels expected to accumulate enough to exceed the federal health standard for PM10 and PM2.5.

During this HPA, Maricopa County Air Quality Department (MCAQD) has declared the following mandatory restrictions:

  • Use of off-road vehicles
  • Use of leaf blowers on governmental properties
  • Wood burning in residential fireplaces, chimineas, outdoor fire pits, and similar outdoor fires (including at hotels and restaurants and individuals/businesses that have permits for open burning)

People with heart or lung diseases, older adults and children are most likely to be affected by particle pollution. PM-10 particles are so small they are able to travel into the respiratory tract where they can cause short-term health effects such as eye, nose, throat and lung irritation, coughing, sneezing, runny nose and shortness of breath. Exposure to these particles can also affect lung function and worsen medical conditions such as asthma and heart disease.

Employers and Travel Reduction Program Transportation Coordinators are advised to activate their HPA Plans immediately. ADEQ further recommends that the general public limit outdoor activity while the HPA is in effect, especially children and adults with respiratory problems.

ADEQ, Maricopa County Air Quality Department (MCAQD) and Valley Metro encourage residents and employers to use the following tips and resources to help make the air healthier to breathe:

  • Visit to learn more about reducing air pollution
  • Drive as little as possible, carpool, use public transit, or telecommute
  • Visit and to plan a transit trip or find a carpool or vanpool
  • Avoid activities that generate dust, such as driving on dirt roads


  • High Pollution Advisory (HPA): Notifies the public that the level of an air pollutant is expected to exceed the federal health standard
  • Health Watch: Notifies the public that the level of an air pollutant is expected to approach the federal health standard
  • Particulate Matter: State and county agencies measure levels of particulate matter (PM) in the air. PM is extremely small solid particles and liquid droplets that circulate in air. PM comes from combustion (cars, industry, wood burning) or dust stirred up into the air. High levels of PM occur when air is especially stagnant or windy. Two types of PM are measured: PM-10, commonly called dust, and PM-2.5, commonly called soot. PM-10 refers to dust particles 10 microns or less and PM-2.5 to soot particles 2.5 microns or less. For perspective, one strand of human hair is 70-100 microns in size.  


The Arizona Department of Environmental Quality (ADEQ) provides a daily forecast for air quality and issues HPAs or Health Watches when these conditions exist. Please visit for the forecast or SUBSCRIBE to receive air quality forecasts via email and/or text message.

Erin Jordan | E-mail > | 602-771-2215 desk | 602-540-8072 cell

The Maricopa County Air Quality Department (MCAQD) is a regulatory agency whose goal is to ensure federal clean air standards are achieved and maintained for the residents and visitors of Maricopa County. The department is governed by the Maricopa County Board of Supervisors and follows air quality standards set forth by the federal Clean Air Act. The department offers air quality information and resources on its Clean Air Make More website:

Bob Huhn | 602-506-6713 desk | 602-526-7307 cell

Valley Metro provides eco-friendly public transit options to residents of greater Phoenix and Maricopa County, including a clean-fuel bus fleet, low-emissions light rail, online carpool matching and bus trip mapping, and bicycle and telework assistance. Funding is provided by local, state and federal revenues; and administered by a board of 16 governments working to improve and regionalize the public transit system. Please visit to learn more.

Corinne Holliday | 602-322-4492 desk | 623-293-0335 cell


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