Smoke from Canadian wildfires continues to blanket parts of the Midwest and Great Plains, leading to air quality alerts across several states. More than 90 fires scattered across Canada are ...

The Air Quality Index was around 160 in many parts of the upper Midwest, indicating poor conditions. The Air Quality Index , or AQI, measures how clean or polluted the air is, ...

The “State of the Air” report shows differences in air quality between eastern and western states. More than 18 million residents in Western states live in counties with failing grades for ...