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Vehicles and heavy industry (steel, glass, textile and chemical plants are the worst offenders) are the top contributors to bad air quality in Mexico City.
The air quality in Mexico City is horrible.
El Paso!
The cities that have the worst air pollution is Pittsburgh and Los Angeles
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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Wichita KS
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Yes.If you dont clean our surroundings the polution will getting worst because of that polution.
Jack Landau has written: 'City of Portland air quality handbook' -- subject(s): Air quality management, Air, Pollution
Mexico City and Sao Paulo are amongst the worst of the major world cities.