Here's what each color code means. ... 300+: The last is code maroon and is considered "hazardous." This will usually prompt a health warning, and everyone is likely to be affected.

The Environmental Protection Agency's air quality color codes were so controversial, a special meeting in 1998 was held in Baltimore to sort them out. ... Detroit, we have a code maroon!

The color codes were such a vital issue, the EPA recently said, a special — and contentious — meeting was held in 1998 in Baltimore to sort it out.

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

The values on that scale are also tied to a six-point, color-coded system -- from Code Green ... With an Air Quality Index of 301-500, conditions are at Code Maroon and considered Hazardous.

The EPA uses a color-coded system to measure air quality — here’s what Code Red, Code Purple and more mean. Learn how to protect yourself including which air filters and air purifiers to ...

According to the federal Environmental Protection Agency, the Air Quality Index is measured on a 500-point scale. The values on that scale are also tied to a six-point, color-coded system -- from ...