Smoke from hundreds of wildfires in Canada has choked the skies over dozens of northern U.S. states in the Great Lakes and ...

Chief at Climate Crisis 24/7, reports on alarming air quality levels across North America, as visualized by AirNow’s ...

Smoke from hundreds of wildfires in Canada is lingering over the northern U.S., spreading across to roughly a dozen states ...

Smoke from Canadian wildfires is causing air quality concerns for millions of Americans in the Midwest and Northeast.

Strong winds — nearing 80 mph in some cases — are driving the Palisades wildfire in California for a second day, forcing thousands of residents to flee while creating a massive cloud of smoke.

According to the EPA, particulate matter, also known as PM 2.5, is a main component of wildfire smoke and is the air pollutant of greatest concern to public health.

Montana, North Dakota, South Dakota, Minnesota, parts of Wisconsin and Iowa were under an air quality alert Monday because of wildfire smoke coming from Canada. Canada is fighting 138 active ...