Arizona Department of Environmental Quality

The Arizona Department of Environmental Quality (ADEQ) is issuing ozone High Pollution Advisories (HPAs) for Maricopa County, effective today and tomorrow, Mon. and Tues., May 22 - 23, 2017. These HPAs are due to ozone levels expected to accumulate enough to exceed the federal health standard for ozone.

The Arizona Department of Environmental Quality (ADEQ) is issuing ozone High Pollution Advisories (HPAs) for Maricopa County, effective this weekend, Sat. and Sun., May 20 - 21, 2017. These HPAs are due to ozone levels expected to accumulate enough to exceed the federal health standard for ozone.

The Arizona Department of Environmental Quality (ADEQ) is issuing an Ozone High Pollution Advisory (HPA) for Maricopa County, effective Tuesday, May 2 and Wednesday, May 3, 2017. This HPA is due to ozone levels expected to accumulate enough to exceed the federal health standard for ozone.

The Arizona Department of Environmental Quality (ADEQ) is issuing an ozone High Pollution Advisory (HPA) for Maricopa County, effective Wed., May 3, 2017. This HPA is due to ozone levels expected to accumulate enough to exceed the federal health standard for ozone.

The Arizona Department of Environmental Quality (ADEQ) issued an ozone High Pollution Advisory (HPA) for Maricopa County, effective May 1-2, 2017. This HPA is due to ozone levels expected to accumulate enough to exceed the federal health standard for ozone.

The Arizona Department of Environmental Quality (ADEQ) has issued a Ozone High Pollution Advisory for April 17 and 18, for areas in and bordering Maricopa County.

These HPAs are due to ozone levels expected to accumulate enough to exceed the federal health standard for ozone.

The Arizona Department of Environmental Quality (ADEQ) has issued a Ozone High Pollution Advisory effective April 11 and 12, for areas in and bordering Maricopa County.

These HPAs are due to ozone levels expected to accumulate enough to exceed the federal health standard for ozone.

The Arizona Department of Environmental Quality (ADEQ) is issuing a High Pollution Advisory (HPA) for Sun., Dec. 18, 2016, for fine particulate matter(PM2.5) for Maricopa County, Arizona. This HPA is due to particle pollutant levels expected to accumulate enough to exceed the federal health standard for PM2.5.

During this HPA, Maricopa County Air Quality Department (MCAQD) declares a “No Burn Day” in Maricopa County, which puts the following mandatory restrictions in effect:

The Arizona Department of Environmental Quality (ADEQ) is issuing an ozone High Pollution Advisory (HPA) for Maricopa County, effective Sat., Aug. 27, 2016. This HPA is due to ozone levels expected to accumulate enough to exceed the new, lower federal health standard for ozone. Also, an ozone Health Watch will be in effect on Sun., Aug. 28, 2016, as ADEQ expects ozone levels to approach the federal health standard.

The Arizona Department of Environmental Quality (ADEQ) is issuing an ozone High Pollution Advisory (HPA) for Maricopa County for Saturday, August 26, 2016.

These HPAs are due to ozone levels expected to accumulate enough to exceed the new, lower federal health standard for ozone.