This High Pollution Advisory is due to ozone levels expected to accumulate enough to exceed the federal health standard for ozone.

This High Pollution Advisory is due to ozone levels expected to accumulate enough to exceed the federal health standard for ozone.

This High Pollution Advisory is due to ozone levels expected to accumulate enough to exceed the federal health standard for ozone.

This High Pollution Advisory is due to ozone levels expected to accumulate enough to exceed the federal health standard for ozone.

Maricopa County residents may have noticed numerous ozone High Pollution Advisories (HPAs) this summer. The purpose of an HPA is to notify the public about the potential for unhealthy air quality conditions so everyone can stay safe.

This High Pollution Advisory is due to ozone levels expected to accumulate enough to exceed the federal health standard for ozone.

This High Pollution Advisory is due to ozone levels expected to accumulate enough to exceed the federal health standard for ozone.

This High Pollution Advisory is due to ozone levels expected to accumulate enough to exceed the federal health standard for ozone.

This High Pollution Advisory is due to ozone levels expected to accumulate enough to exceed the federal health standard for ozone.