Each Air Quality Index category, also known as the level of concern, is attached to a certain range of values: Good (green): 0 to 50; Moderate (yellow): 51 to 100; ...

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 EPA breaks the Air Quality Index into a few categories with different recommendations. Green (0–50): The air is safe to ...

The national average air quality index in 2023 was 38, according to IQAir, a Swiss air quality technology company. More than 100 nations had cleaner air , on average, than the United States, and ...

Here’s how to understand the Environmental Protection Agency’s Air quality index (AQI), which measures, on a 300-point scale (along with six categories and advisories), the quality of air in ...

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 ...

The Air Quality Index does not take into account many gas or particle contaminants that are produced during wildfires, particularly when houses, cars and other man-made materials go up in flames.

If you live in the Midwestern, Northeastern or Middle Atlantic U.S. and breathe air, there’s a good chance that you’ve heard about the Air Quality Index (AQI) at some point over the past month ...

The Air Quality Index, or AQI, is the primary system used to warn the public when air pollution is dangerous. It’s based on data collected from 5,000 air monitors across the country.

The toxic air in the United States this week has flirted with the upper range of the 500-point scale. In the past decade, there have been times when the air quality was even worse.