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The city of Los Angeles is generally considered to have America's worst air pollution problem. Most of California's metro areas have bad air pollution.
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China is the country with the highest air pollution with 21.5% of the global total.
Asia does.
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There is major air pollution in Mexico, the USA, and South America. Walking the streets of some mega cities for a day is the equivalent of smoking 60 cigarettes. Hope this answer is what you needed!
Air, water, and land pollution Fighting and crime
The cause of Beijing's rampant air pollution is from constantly working factories and millions of cars on the roads. Beijing has some of the worst air pollution in the world.
The cities that have the worst air pollution is Pittsburgh and Los Angeles
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