This measure, based on data from the Environmental Protection Agency, evaluates states on the number of days the Air Quality Index in counties was not rated “good.” U.S. News calculated a ...

The US government will stop sharing air quality data gathered from its embassies and consulates, worrying local scientists and experts who say the effort was vital to monitor global air quality ...

It comprises two measures: the number of days with an air quality index below a certain threshold and the number of violation points against drinking water systems in each state. Learn more about ...

and forecast models to provide real-time air quality index (AQI) readings for more than 1,000 locations. Los Angeles’ air quality is closely tied to weather patterns. Clear, breezy days help ...

The Air Quality Index in Delhi dropped to 999 over the weekend, making it the most polluted capital city in the world. While the safe limit set by the World Health Organisation is 25, anything ...

Please refer to the AirNow information on wildfires to learn how and why the United States Environmental Protection Agency (EPA) applies a correction factor to PurpleAir data to estimate the air ...

Since 2008, embassies and other diplomatic posts had been publishing data about local air quality. In many countries, it was the only reliable source of such information. By Lisa Friedman and Brad ...

6, 2025, (AP Photo/Sakchai Lalit, File) FILE - A pedestrian wears a face mask in front of a sign displaying an Air Quality Index in Bangkok, Thailand, Feb. 6, 2025. (AP Photo/Sakchai Lalit ...