Millions of Americans and Canadians are breathing bad air right now due to wildfire smoke. Here’s what you need to know masks ...

This story originally appeared on High Country News and is part of the Climate Desk collaboration. The more researchers learn about wildfire smoke, the more worrisome the picture gets. Smoke contains ...

Wildfires in Canada are pouring thick clouds of smoke into the US and will usher in unhealthy air quality for millions of people in Northeast and Midwest.

Wildfires are spreading through Southern California, and where there's fire, there's smoke — which, research shows, can be as deadly as the flames themselves. Recently, a group of scientists sought to ...

Smoke from wildfires across the continental U.S. is stalling — in some places, reversing — years of progress on air quality. A new study published in Nature found that since 2016, wildfire smoke has ...