Chicago faces poor air quality and sweltering heat today and tomorrow, followed by scattered storms heading into the weekend.

Chicago faces a heat wave with poor air quality due to wildfire smoke and ozone; temperatures may hit mid-90s.

As of Thursday morning, Chicago, Detroit and Washington, D.C. were ranked as the three cities with the worst air quality in the world, according to IQ Air's Air Quality Index.

ABC7 Chicago's Air Quality Tracker provides real-time updates on the latest air quality data available from government monitors across the region. ... The air quality index breaks down as follows:

The World Air Quality Index reported, Chicago had the worst air quality on Tuesday. That group marked Chicago's air "unhealthy," and in the red zone. According to CBS 2 meteorologists, ...

By 12:30 p.m., the Air Quality Index had reached unhealthy levels in the entire Chicago area, with AirNow.gov showing the city with an AQI of 163, the north and west suburbs with an AQI of 158 and ...

Low: 68.   Tuesday opens with plenty of sunshine but some cottony cumulus clouds arrive on the scene by/during the afternoon. Tuesday Air Quality Alert The Illinois Environmental Protection Agency has issued an Air Pollution Action Day for Tuesday July 15th for the greater Chicago metropolitan area through Tuesday night.