Wildfire smoke is a mixture of gases, water vapor, air pollutants and fine particulate matter, the latter known as PM2.5, which is at least 30 times smaller in diameter than a human hair.

This haze is already bad for human health, and now there’s the added potential for arsenic and other toxicants in the Canadian landscape to get caught up in wildfire smoke. “It’s a bad-news ...

NEW YORK — Smoke from Canadian wildfires poured into the U.S. East Coast and Midwest on Wednesday, covering the capitals of both nations in an unhealthy haze, holding up flights at major ...

Smoke from Canadian wildfires to affect air quality, visibility: What to know by: BJ Lutz, Anna Roberts, Michael Bartiromo Posted: May 30, 2025 / 10:57 AM EDT Updated: May 30, 2025 / 11:49 AM EDT ...

Smoke from Canadian wildfires lingers in downtown Detroit skyline off of Woodward Avenue on Tuesday, June 27, 2023. "One of the big impacts of climate change is increased heat and changing humidity.

The smoke is the result of one of Canada’s worst wildfire seasons in decades — nearly 500 active wildfires were burning in Canada early Wednesday, according to the Canadian Interagency Forest ...

Within wildfire smoke is also PM 2.5, particulate matter smaller than 2.5 microns (a millionth of a meter) that gets deep inside human lungs.

Smoke from Canadian wildfires to affect air quality, visibility: What to know by: BJ Lutz, Anna Roberts, Michael Bartiromo Posted: May 30, 2025 / 10:57 AM EDT Updated: May 30, 2025 / 11:49 AM EDT ...

Researchers say the increase in wildfire activity is driven by climate change. Such fires have also contributed to about 15,000 deaths from exposure to smoke particulates in the U.S. between 2006 ...