While Portland, Oregon is the greenest city in the USA. The following cities could learn a few things from Portland.  Here are the most polluted Cities in the USA.

Top 10 U.S. Cities Most Polluted by Short-Term Particle Pollution:
1) Pittsburgh, Pa.
2) Los Angeles/Long Beach/Riverside, Calif.
3) Fresno/Madera, Calif.
4) Bakersfield, Calif.
5) Birmingham, Ala.
6) Logan, Utah
7) Salt Lake City, Utah
8) Sacramento, Calif.
9) Detroit, Mich.
10) Baltimore, Md./Washington, D.C./Northern Virginia.

Top 10 U.S. Cities Most Polluted by Year-Round Particle Pollution:
1) Los Angeles/Long Beach/Riverside, Calif.
2) Pittsburgh, Pa.
3) Bakersfield, Calif.
4) Birmingham, Ala.
5) Visalia/Porterville, Calif.
6) Atlanta, Ga.
7) Cincinnati, Ohio
8) Fresno/Madera, Calif.
9) Hanford/Corcoran, Calif.
10) Detroit, Mich.

Top 10 U.S. Cities Most Polluted by Ozone:
1) Los Angeles/Long Beach/Riverside, Calif.
2) Bakersfield, Calif.
3) Visalia/Porterville, Calif.
4) Houston, Texas
5) Fresno/Madera, Calif.
6) Sacramento, Calif.
7) Dallas-Fort Worth, Texas
8) New York, N.Y./Newark, N.J.
9) Baltimore, Md./Washington, D.C./Northern Virginia
10) Baton Rouge, La.

To see what grade (A to F) your community’s air quality earned, visit the American Lung Association website at www.lungusa.org.