Fires and agricultural soils can rival cars and factories in emitting chemicals that lead to ozone, making it hard to meet air quality standards.

The Phoenix area's long-standing ozone pollution issues could have serious impacts on local economic competitiveness and ...

Health experts warn that ozone pollution poses significant health risks ... That makes it prone to temperature inversion, a ...

The EPA's decision on the Valley's ozone nonattainment issue could have big impacts on public health and the local economy.

a different type of air pollution. On Wednesday, he publicly asked Kelly to send over a catalog of requests for his agency — a list that is almost certain to include pausing the ozone ...