Smoke from Canadian wildfires has impacted the air quality throughout United States, including in the northern High Plains, Midwest, Great Lakes, southern Mid-Atlantic and into the Northeast. This has ...

Those affected by wildfire smoke focus on the colors red, purple and maroon on the air quality charts. Red used to be the scariest color. Why did that change?(Story aired on ATC on June 28, 2023.) ...

If you haven’t paid attention to the air quality index until now, you’re probably learning a lot about it rather quickly. Philadelphia and Washington, D.C. are under an air quality level that people ...

PHILADELPHIA (CBS) -- Air Quality Index (AQI) refers to the Environmental Protection Agency's scale regarding the health impact of air quality and pollution in the U.S., regulated under the Clear Air ...

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 Code ...

Smoke, dust, dirt, soot and salt in the air, plus certain chemicals in the air including ozone, can reach levels that are harmful to health. Those most vulnerable to air pollution include people with ...

Air quality worsened to code red Thursday in the Washington, D.C., area because of smoke from Canadian wildfires, posing a health risk to anyone who spends time outside. It comes less than three weeks ...

Smoke from Canadian wildfires is again blanketing parts of the U.S. in a thick haze. Midwestern cities like Chicago, Minneapolis, Detroit and Milwaukee posted some of the worst air quality in the ...