The EPA's Air Quality Index can tell you whether breathing outside air can be harmful. Here's how to read the scale to plan ...

What does PM2.5 mean on the air quality index? On the AQI, particulate matter readings, labeled "PM2.5," range from 0-301 or higher, and measure the fine particulate matter in the air , such as ...

The different levels of the Air Quality Index. Anything below 50 AQI is considered satisfactory. Once you get from 50-100 AQI, it is considered acceptable.

The Air Quality Index (AQI) is used by various government agencies to report how clean or polluted the air is in your area. For example, you may have spotted this metric popping up in local ...

When skies are smoky or hazy, there’s a good chance that the air quality has dropped to unhealthy levels. To determine this, we rely on the air quality index (AQI). Watch this video to see what ...

Canadian wildfire smoke lingers in Michigan. Officials issued an air quality advisory in southeast Michigan for July 15.

Canadian wildfire smoke remains in Michigan. On July 16, officials issued an air quality advisory for western counties.

With wildfires growing more intense and frequent, many Canadians are wondering about the short- and long-term effects smoke ...

What does the air quality index mean? The AQI shows the outdoor air quality for public health. It features six color-coded categories, from good (0-50) to hazardous (301 plus).

What does the air quality index mean? The AQI shows the outdoor air quality for public health. It features six color-coded categories, from good (0-50) to hazardous (301 plus).

Additional plumes of smoke from Canada's active wildfires prompt officials to issue a statewide air quality alert on July 14.