Air quality in the Chicago area Wednesday and even into Thursday was expected to be at unhealthy levels, the National Weather ...

An air quality alert has been issued for parts of the Chicago area, but what’s causing issues this week? According to the ...

Sensitive groups may be impacted by the high ozone levels lasting through midnight Wednesday, according to the National ...

Chicago has the largest air quality monitoring network in the country thanks to a partnership between the city, the ...

The Chicago area is under an air quality alert until Wednesday night, weather officials have announced. The alert, issued by the Illinois Environmental Protection Agency, applies to Cook County and ...

In Chicago, there's a city-wide effort to track air pollution. The science sits on street corners, hanging above passersby in ...