The Arizona Department of Environmental Quality has extended Tuesday’s ozone health watch through Wednesday. Rising ozone levels may approach federal standards, prompting the health watch, according to a release.
Ozone is an invisible gas created when other pollutants in the air are heated by the sun. Prime ozone production comes in the late afternoon. People with existing respiratory conditions should limit time outdoors.
Drivers are urged to carpool and only fuel vehicles in the morning or after dark to help cut down on ozone production.