The air quality index measures PM2.5, less than 2.5 microns particles, to determine the intensity of air pollution in cities.

Heavy smoke from wildfires more frequently chokes the skies over the Western United States, but cities farther to the east are no longer being spared, new research shows. Canada's unusually ...

The Vail Valley and Colorado’s Western Slope often see smoke from wildfires elsewhere in the Western United States. That won’t be the case with the devastating wildfires in the Los Angeles area, at ...

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

from wildfire smoke found that levels had increased by up to five micrograms per cubic metre in the western US in the past decade – enough to reverse "decades of policy-driven improvements in ...

The wildfire strikes an inland region of North Carolina that is still recovering from the damage wrought by Hurricane Helene ...

The North Fork Fire in McDowell County has burned an estimated 200 acres in an area of heavy tree damage from Hurricane Helene. This has lead to higher smoke production that is now impacting air ...

Researchers have shown that plumes of wildfire smoke can carry contaminants hundreds of kilometers, leaving a toxic and ...

Wednesday marked four months since Hurricane Helene ravaged the western Carolinas - and residents in McDowell County are facing yet another hardship.

Depending on where you live, you could be wrong. That's because even after wildfires are over, the smoke can linger in the atmosphere for days or weeks. The smoke also can travel hundreds of miles ...