An air quality index of 300 or higher is considered hazardous, and the record-breaking smoke AQI in Grand Portage reached 800 ...

As Canadian wildfire smoke returns to the Chicago area, an air quality alert has been issued for most of the region. The Air Pollution Action Day was issued by the Illinois Environmental Protection ...

Smoke from a series of wildfires burning across central Canada has prompted officials to issue an air quality alert for the ...

Wildfire smoke engulfs the Twin Cities and rain isn't helping originally appeared on Bring Me The News. The worst air quality ...

An air quality emergency has been issued in a major US city, warning residents that any exposure could lead to serious health effects.

Smoke from more than 100 wildfires blazing in Canada is expected to spread to impact air quality in more U.S. state.

The smoke from the wildfires is primarily aloft, resulting in a milky sky and vivid sunrises and sunsets. Air quality levels ...

Natural gas has become a go-to fuel for power plants from coast to coast, sometimes replacing dirtier coal-fired plants and, ...