Kilometers above the Earth’s surface, the ozone layer protects humanity and all life from the sun’s harmful ultraviolet rays.

Ground-level ozone is a major air pollutant that shortens human lives and kills thousands each year, resulting in major ...

Poor air quality has prompted officials to issue an ozone high pollution advisory for Maricopa County through Thursday.

Weather conditions can influence air quality and the impact of the Masters could be more or less pronounced depending on ...

Residents of Houston and surrounding areas are being urged to limit emissions on Wednesday due to air quality concerns.

The decision bought officials time to avert economic harm, but raised concern from health advocates about the continued impacts of ozone on Arizonans.

The move will give state regulators more time to develop a plan to improve air quality in metro Denver and the region, and to ...

On warmer days, when the sun is out and the air is stagnant, ozone can concentrate lower, closer to the ground ... the level and duration of the activity. How you can help reduce ozone pollution ...