What are "Code Purple" air quality alerts? The Air Quality Index has six color-coded categories, ranging from cleanest to hazardous.

With smoke from Canadian wildfires triggering air quality alerts across the Midwest, millions of people in cities like Chicago, Detroit and Milwaukee are becoming intimately familiar with the Air

Columbus air quality hit a worst-ever record 554 AQI on Friday, July 17, due to Canadian wildfire smoke. Relief is expected with rain forecast Friday and this weekend.

As Michigan experiences its first real exposure to wildfire smoke this summer, weather forecasters are talking about the air quality index, sensitive groups and other terms that may not be familiar to most Michiganders.

Delaware is under a Code Orange air alert due to possible smoke from Canadian wildfires. Check to see latest air quality.

Wildfire smoke is causing unhealthy air quality across Ohio. Alerts remain in effect until midnight on Friday.

Canadian wildfire smoke has diminished air quality across the Valley since Thursday. Here’s the index behind the health of the air, and how it can impact our health.

An Air Quality Alert remains in effect Friday for all of New Jersey. Smoke from the Canadian wildfires continues to blanket the state, raising the Air Quality Index from unhealthy to very unhealthy levels,

An Air Quality Alert has been issued for Saturday by the he Michigan Department of Environment, Great Lakes, and Energy, the fifth straight day of such a designation due to the Canadian wildfires, according to SEMCOG.

Detroit has the most polluted air in the world among major cities on Friday morning as smoke from wildfires in Canada and Minnesota lingers, according to Swiss air quality technology company IQAir. The city had an air quality index,

New York City is forecast to have worse-quality air than Delhi on Thursday, as massive wildfires in Canada push hazy skies and dangerous smoke south. The city’s Air Quality Index (AQI) score reached Level Red on Thursday morning,