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As the City of Chicago braces for another sweltering day, an air quality alert remains in effect due to rising temperatures approaching the 90-degree mark.

Air quality alerts have been issued across 12 states for Wednesday, according to the National Weather Service.

Wildfire smoke brings hazy skies and poor air quality to Chicago today, with hot and humid weather building into the weekend.

Why is the air quality bad? The Chicago-area weather forecast Wednesday and Thursday includes an air quality alert.

Air quality alerts have been issued across the Midwest, Northeast and southern California.

An air quality alert was issued for the Chicago area through midnight on Wednesday due to lingering Canadian wildfire smoke. According to AirNow, Chicago is under "moderate" air quality.