Smoke from wildfires in Canada has drifted into the U.S., prompting air quality alerts for Americans as it continues to spread. But when officials and forecasters classify a city's air as "unhealthy" ...

Smoke from Canadian wildfires has impacted the air quality throughout United States, including in the northern High Plains, Midwest, Great Lakes, southern Mid-Atlantic and into the Northeast. This has ...

The U.S. Air Quality Index (AQI) is the Environmental Protection Agency’s tool for reporting outdoor air quality and health. The AQI includes six color-coded categories, each corresponding to a range ...

PHILADELPHIA (WPVI) -- With smoke blowing into the Philadelphia region from the wildfires in Canada, you may have heard a lot about the Air Quality Index or AQI. But what it is, exactly? The Air ...

Air quality levels in parts of Canada and the US have nosedived in recent days as winds have carried smoke from wildfires in Quebec and Nova Scotia across the continent. Things are bad enough that New ...

The color-coded Air Quality Index categories you’ll find on the Environmental Protection Agency’s AirNow website rank air quality on a 500-point scale and are meant to give the public an easy way to ...

NEW YORK, NEW YORK - JUNE 7: A person waiting for the subway wears a filtered mask as smoky haze from wildfires in Canada blankets a neighborhood on June 7, 2023 in the Bronx borough of New York City.

Poor air quality has many people breaking out their pandemic masks for protection. Wildfire smoke can lead to coughing and wheezing, symptoms smokers experience. A new calculator estimates how the air ...

SALT LAKE CITY (KTVX) — On Friday, Feb. 4, Salt Lake City reached an air quality index score (AQI) of 154, which the state calls “unhealthy.” But what does that score really mean? According to an ...