The most polluted us cities can involve greenhouse gases, air pollution, and other types of environmental pollution as well. Many of the absolute worst are cities where manufacturing has played a large role through many years. Pittsburgh, Pennsylvania is one of the cities which consistently makes the worst list, for both air and water pollution. This is due in part to the steel mill industry which is still present today. The city has a large manufacturing base, and it shows in the air quality which is horrible. Another of the most polluted us cities is actually a group of cities which make up a region in the state of California. Los Angeles, Riverside, and Long Beach, California, make up a trio of the cities with the worst air in the country.
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