6) Philadelphia, Pennsylvania

Traffic congestion, river dumping, abandoned neighborhoods and abandoned buildings are adding to the problems of Philadelphia. Today Philadelphia, the largest city in Pennsylvania, is very dirty. River Delaware near the city is one of the dirtiest rivers in America.

5) Baton Rouge, Louisiana

The location of Baton Rogue makes it difficult for the authorities to keep it clean. The city is located on the eastern bank of River Mississippi. All the pollution from cities located upstream reach Baton Rogue. Oil and coal industry is adding to the pollution of this city. Since Baton Rogue is not a windy city, all the pollutants remain in the city’s air.