The 20 Dirtiest Cities in the U.S.

California has 7 of the 20 cities with the poorest air quality, according to a list complied by Forbes. Bakersfield, which has 60 days of unhealthy air a year, takes the top spot for its hot and dusty weather and proximity to oil fields.

On the state level, California regulations on carbon emissions such as a cap-and-trade programs, and reducing vehicle emissions should help improve the air quality in its cities.

Further improvements will be made at the federal level as well. The Environmental Protection Agency's expected rules on power plants will lead to companies either retrofitting plants with new technology, or closing power plants altogether, reports Christopher Helman.

Data from The American Lung Association's State of the Air 2011 report was used to compile this list.

Full Story: America's 20 Dirtiest Cities


Brand new! Urban Grid City Collection

Each city has its own unique story. Commemorate where you came from or where you want to go.
Book cover of the Guide to Graduate Planning Programs 4th Edition

Thinking about Grad School?

The Planetizen Guide to Graduate Urban Planning Programs is the only comprehensive ranking and listing of graduate urban planning programs available.
Starting at $24.95
Red necktie with map of Boston

Tie one on to celebrate your city!

Choose from over 20 styles imprinted with detailed city or transit maps.
Woman wearing city map tote bag

City Shoulder Totes - New Cities Added!

Durable CityFabric© shoulder tote bags available from 9 different cities.