El Paso!
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.
The cities that have the worst air pollution is Pittsburgh and Los Angeles
Mexico City
the largest city is Mexico City, it also has the dubious reputation for having the worst pollution in the world.
America
Detroit is the worst overall city. For larger cities, Chicago is statistically pretty bad. Chicago has some of the worst stats involving taxes, unemployment, youth violence, traffic congestion, pollution, corruption....on and on.
Pittsburgh, Pennsylvania, replaced Los Angeles, California for the most polluted city in America.
New York, Las Vegas, Hollywood, Nevada, and so many more!
China
Asia does.
As everyone can see,the air pollution index is use by thegovernment to measure the air quality index and to detect anypollutants in our country¶s air.This is to ensure the air is cleanand safe for us to inhale.Besides that,an early warning can begiven to us if the air pollution is to high for us to get out of our homes. This warning is given based upon readings andinterpretations of the air pollution index