Air quality returns to safe levels in Deer Park after a chemical odor incident, though the source remains unidentified.

Canadian wildfire smoke lingers in Michigan. Officials issued an air quality advisory in southeast Michigan for July 15.

The Port of Oakland joins the BWBS initiative to protect whales and reduce air pollution by slowing ship speeds.

On June 24, the city released initial air quality test results. But the analysis was flawed, some experts said.