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

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

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

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 alert will remain go into effect starting at midnight on Saturday, June 21, through Monday, June 23, for counties in Ohio ...

More Saharan dust drifts into Southeast Texas again Friday, but the otherwise mostly rain-free skies should allow fireworks to continue as planned.

The Kingston Air Quality Initiative has also been placing PurpleAir sensors in local libraries to create a network of hyperlocal air quality data across the Hudson Valley. Above, a sensor at the ...

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 index basics: How it works, what each color code means and how to stay safe. Prolonged and heavy exertion outdoors increases your risk for exposure to poor air quality when the AQI is ...