As smoke from Canadian wildfires has made its way into the U.S., it is important to understand how the air quality index works. Here's what each color code means.

The chart shows information about the local air quality and health concerns associated with each color. The AQI is on a scale of 0 to 300. A value over 100 represents unhealthy air quality.

The term “code red” comes from the U.S. Environmental Protection Agency’s color-coded Air Quality Index (AQI), which tracks five major air pollutants: ground-level ozone, carbon monoxide ...

So it's also the color on the government chart showing the air quality index is more than 150, meaning unhealthy. When it's more than 200, it's purple - very unhealthy. This makes sense to ...

Air Quality Action Day alerts are issued when the air quality index is forecast to be orange or higher. The chart below provides more detail on the index values and the corresponding color codes.

Air Quality Action Day alerts are issued when the air quality index is forecast to be orange or higher. The chart below provides more detail on the index values and the corresponding color codes.

Tuesday declared Code Orange Air Quality Action Day The DEP said the Eastern Canada Wildfires are likely contributing to the air pollution. YEAH, GOOD MORNING TO YOU, JANELLE.

Code Orange Air Quality Action Day in place as smoke from Canadian wildfires moves through Western P 02:07. PITTSBURGH (KDKA) -- A Code Orange Air Quality Alert is once again in place for the ...

But is the color coding system even accurate? The answer is 'sometimes. ' Back in November, 2News noticed that the air outside looked bad but DEQ's air quality app said it was a "green" or "good" day.

A "Code Orange Air Quality Action Day" has been declared for Friday in the Philadelphia, Lehigh Valley-Berks and Susquehanna Valley areas, according to the Pennsylvania Department of Environmental ...