The city is racing to put up 277 sensors. Once installed, Chicago will have the most high-quality air monitors in the country ...

Concern for poor air quality in the greater Chicago area remains as the Illinois EPA extends its alert until Thursday night.

The "unhealthy" air, which ranks as level four of six on the Air Quality Index, comes after multiple consecutive days of air quality alerts.

Chicago officially had the worst air quality in the world for a few hours Thursday. As a haze of Canadian wildfire smoke blanketed the metro area, no other major city in the world had air pollution ...

Chicago faces an air quality alert due to Canadian wildfire smoke and high ozone levels, with risks for sensitive groups.

Hazy skies from wildfire smoke will linger through the weekend in Chicago, with mild temperatures and an air pollution alert ...

CHICAGO The Illinois Environmental Protection Agency (Illinois EPA) and the Illinois Department of Public Health (IDPH) are urging residents to use caution ...

As Canadian wildfire smoke lingers in the skies, the Chicago area will soon be under an air quality alert, but the smoke ...

Saturday offers generous sunshine mixed with puffy fair weather clouds, comfortable temperatures and low humidity. An Air ...

National Weather Service officials issued an air quality alert set to expire at midnight Saturday for the Chicago and ...