Forbes.com: America's Dirtiest Cities
Introduction
Much of the data for our list of the 20 Dirtiest Cities In America is derived from rankings done by Bert Sperling on his Bestplaces.net website. Sperling is known for his books like “Best Places To Raise Your Family” and “Cities Ranked And Rated.” His website features tools that let you slice and dice cities by a whole host of categories, like cost of living and income, as well as by water and air quality.
Sperling’s air quality index is based on annual data from the EPA, which factors in ozone and pollutants like carbon monoxide, sulfur dioxide, lead and volatile organic chemicals.
(AP Photo/Mark Lennihan)
More from Forbes:
Cities Where Home Prices Are Still Tumbling
The Easiest And Hardest Cities For Finding A Job
Where Americans Are Moving
The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.













