Summer Ozone

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The Arizona Department of Environmental Quality (ADEQ) monitors air quality across Maricopa County against levels of acceptance set by the U.S. Environmental Protection Agency’s Air Quality Index (AQI).

When a “Health Watch” is called:
ADEQ will issue a “health watch” when forecast levels will impact those who are unusually sensitive to ozone. Active children and adults, and people with lung disease, such as asthma, should reduce prolonged or heavy exertion outdoors.

When a “High Pollution Advisory” is called:
ADEQ will issue a “high pollution advisory” (or HPA Day) when forecasted weather conditions are expected to generate levels of ozone that may exceed the federal health standard. Active children and adults, and people with lung disease, such as asthma, should avoid prolonged or heavy exertion outdoors. Everyone else, especially children, should reduce prolonged or heavy exertion outdoors. Other tips:

  • Drive as little as possible. Carpool, plan a bus or light rail ride at ValleyMetro.org or telecommute.
  • Avoid idling your vehicle and refuel after dark.
  • Avoid using gas-powered lawn and garden equipment.
  • Seal containers of household cleaners, workshop chemicals and solvents and garden chemicals to prevent gases from evaporating into the air.
  • Cease all wood burning and use of gas-powered leaf blowers. These activities on HPA days can result in fines from Maricopa County.