for immediate release
Maricopa County Homepage   MARICOPA COUNTY
Green Government
222 N. Central Avenue, 5th Floor
Phoenix, AZ  85003
Ph 602-372-0875

Ozone Health Watch Extended Through Wednesday

Levels of ground level ozone pollution continue to collect in our air.  Air quality forecasters say areas of the Valley will remain at risk for near-to-unhealthy ozone levels today and tomorrow.  Winds are expected to increase on Wednesday which will help disperse pollution concentrations.
In the meantime, do your part to help us prevent adding more pollution to the air.  Take action and put some of these air friendly practices into your daily routine. 

Take Action

  • Avoid waiting in long drive-thru lines, for example, at coffee shops, fast-food restaurants or banks. Park your car and go inside.
  • Unplug unused appliances.
  • Fuel your vehicle after dark or during cooler evening hours.
  • Connect your outdoor lights to a timer or use solar lighting.
  • Learn more about air pollution at
  • To find a carpool or vanpool visit or call 602.253.5000

Ground level ozone is formed by a chemical reaction that needs heat from sunlight, nitrogen oxides and volatile organic compounds [VOCs] to form. The months of April through September make up our Valley’s longer-than-normal “ozone season.”

"Health Watch" means the highest concentration of pollution may approach the federal health standard. Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion during a health watch.

"High Pollution Advisory" or "HPA" means the highest concentration of pollution may exceed the federal health standard. Active children, adults and people with lung disease such as asthma should reduce prolonged or heavy outdoor exertion. Maricopa County employers enlisted in the Trip Reduction Program are asked to activate their HPA plans on high pollution advisory days.


   << Back