Minneapolis was ranked among the cities with the cleanest air, while Seattle was praised for its investment in green spaces and sanitation in a new study.

PORTLAND, Ore. (KOIN) — Portland’s air quality is currently comparable to Los Angeles, despite the ongoing wildfires in ...

The hearing on Monday night marked the relaunch of Zenith’s air permit process after state regulators put it on hold last ...

The Environmental Protection Agency is investigating whether companies at Portland’s fuel ... are regulated by the Clean Air Act and must secure air quality permits from the Oregon Department ...