An air quality map shows conditions improving in the U.S. on Friday as smoke from the Canadian wildfires subsides.

Online map tools and resources let you track the Canadian wildfires and monitor poor air-quality conditions, which are impacting US states.

Maps show where new plumes of smoke will cause hazy skies through the end of the week. Low-level smoke is forecast to spread eastward Wednesday across the Appalachians and into the Mid-Atlantic and Northeast.

Smoke from 150-plus wildfires in Canada could affect air quality and cause health problems for Americans. Is Ohio in the path? What to know.

There is no evidence of a safe level of exposure to some of the pollutants, meaning that smoke can impact your health even at very low levels. Inhaling smoke from wildfires can cause headaches, sore and watery eyes, nose, throat, and sinus irritation, chest pains, heart palpitations and more.

Lightning, which is more common in hotter temperatures, is usually the cause of wildfires that burn the most land. In 2023, scientists at Canada’s natural resources department found that lightning sparked fires that burned 93 percent of the total wildfire area, and the remaining seven percent of the area burned from human causes.

To check your state's air quality, visit AirNow's website, and plug in your zip code, city or state. Here's what to know as of Wednesday, June 4. Parts of Wisconsin, Iowa, Illinois, Indiana and Michigan have air quality that is considered unhealthy for sensitive groups or unhealthy for all, according to AirNow.

Officials issue an air quality advisory for counties in southwest Michigan as Canadian wildfires burn. Here's what the air quality index shows.