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 ...

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 ...

Air quality conditions across several U.S. cities reached levels this week that ... The Environmental Protection Agency's Air Quality Index (AQI) map for Thursday displays a number of orange ...

Less than one-fifth of the cities worldwide met the international criteria for clean air in 2024, a global study has found. The IQAir World Air Quality ... air among large American cities.

A new study has found a direct link between early-life exposure to ground-level ozone and asthma or wheezing in young children.

March 11 (UPI) --Fewer than one in five global cities met World ... each cubic meter of air, Swiss environmental technology ...