CHICAGO - An Air Quality Alert is in effect until midnight Wednesday night for the following counties: McHenry, Lake (IL), Kane, DuPage, Cook, Kendall, Grundy, Will, Lake (IN), Porter, Newton, and Jasper.

The 2025 fire season in Canada has been quite active thus far, and the reason why might be a little hazy. Let's go over why!

Dig deeper:

The red pixels are indicative of what are known as "hotspots."

Through a collaborative effort between NOAA and NASA, infrared satellites are able to identify heat sources. The map is then filtered for known industrial fires, so that only vegetative wildfires appear as a hotspot.

During the summer months, a common weather pattern often sets up across the continental United States.

This pattern typically includes a high-pressure system (anticyclone

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