Calculating air pollution from wildfires and other events has become more complicated. That doesn’t mean it’s necessarily ...

Air quality in wildfire-stricken Los Angeles improved on Thursday from hazardous peaks hit earlier this month, as tiny soot ...

On Friday, the South Coast Air Quality Management District issued a smoke advisory for the fourth consecutive day, largely ...

As people return to the structures spared from Los Angeles wildfires, experts warn that they should be careful of the air ...

Major air pollutants have declined in recent decades, but USA TODAY’s analysis shows wildfire smoke is taking their place.

Wildfires are tearing through thousands of acres in Los Angeles County in California, as strong Santa Ana winds stoke the ...

After the fires get under control, wind could help push some particles out of the air, as will gravity with some larger ...

Twelve Texas counties have recently exceeded federal air quality standards for particulate matter, commonly known as soot.

As the wildfires raged and smoke billowed across Los Angeles, officials issued air quality alerts, schools canceled classes ...

California regulators say the Trump administration is unlikely to approve the rules and that they have no choice but to ...