The Air Quality Index is used nationwide to measure the severity of air pollution and categorize the health risks that are involved with various levels of pollution. ... (purple): 201 to 300 ; ...

The EPA's Air Quality Index can tell you whether breathing outside air can hurt you. ... Purple indicates very unhealthy air (151-200) Maroon indicates hazardous air (301 plus).

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 ...

The EPA's Air Quality Index can tell you whether breathing outside air can hurt you. ... Purple indicates very unhealthy air (151-200) Maroon indicates hazardous air (301 plus).

Using the Air Quality Index (AQI) the purple air monitors display information by both number and color. Green indicates 0-50 AQI, meaning air quality is good. Yellow, which is 51-100 AQI, is moderate.

The Southwest Ohio Air Quality Agency reports that "levels of ozone within the region may approach or exceed unhealthy ...

The U.S. has one of the world’s most advanced systems to monitor air pollutants. Can it keep up with a changing climate?

Air quality is measured by the Air Quality Index, or AQI. The index was created by the Environmental Protection Agency in 1999. When the AQI exceeds 50, air quality alerts, or AQAs, are issued.

Air quality is measured by the Air Quality Index, or AQI. The index was created by the Environmental Protection Agency in 1999. When the AQI exceeds 50, air quality alerts, or AQAs, are issued.

Transylvania and Henderson counties are under a Code Purple air quality advisory on Friday, March 28. Buncombe, Swain and Polk counties also have Code Red unhealthy air. How to know if the ...