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 ...
There were seven global cities with the best air quality—that within the WHO zone —with San Juan in Puerto Rico (2.7) coming in first place, followed by Wellington in New Zealand, Canberra in ...
1monon MSN
The Air Quality Index is a six-category scale from 0 to 500, the higher the number the greater amount ... be in the green ...
The air and water quality subcategory informs the best states for natural environment rankings and the overall Best States rankings. It comprises two measures: the number of days with an air ...
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