25 Most Polluted Cities In America

Medford-Grants Pass, OR

towers putting smoke in the air
(Photo by Chung Sung-Jun/Getty Images)

This area is 25th for 24 hour particle pollution out of a list of 220 metro areas. It is number one for the cleanest metro area for Ozone and #37 for annual particle pollution.

Since 1997, this city has had 2.3 less days of pollution. Efforts to curb carbon emissions are proving to be effective in decreasing the number of days with short-term particle pollution per year.