4) Los Angeles, California
Los Angeles is not a city, it is an endless urban sprawl. Traffic congestion, high population density, manufacturing industry, farming industry and chemical emission are polluting Los Angeles. People of this huge city suffer from high air pollution. Vehicles and factories release smog to the city’s air every day.
3) St. Louis, Missouri
The River Missouri downstream from St. Louis is polluted by trash and toxic chemicals. The city is home to a radioactive landfill, an inland port and chemical plants. The confluence of Mississippi and Missouri is the third largest inland port and home to more than 150 industrial sites. Lack of funds is making it difficult for the authorities to clean the city. Currently St. Louis is struggling with its economy.
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