A new report has shed light on the locations of the most polluted cities in the U.S. On Tuesday, IQAir, a Swiss tech company that tracks global air quality, released the report, which evaluated the ...

evaluates states on the number of days the Air Quality Index in counties was not rated “good.” U.S. News calculated a population-weighted average from available figures to determine the air ...

In a positive development for the national capital's air quality, Delhi recorded its lowest Air Quality Index (AQI ... also the first to see global average temperatures rise 1.5 degrees Celsius ...