In cities which have not taken steps to limit the problem - at the moment some of the Chinese cities have this problem.
China is the country with the highest air pollution with 21.5% of the global total.
Asia does.
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.
co2
El Paso!
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
the environment. and air pollution. it makes it worst for people with asthma.
The worst is air pollution and acid rain caused by air pollution. Water (rain) and wind also cause some weathering.
America
Mexico City
The EPA recently conducted a survey in which San Bernardino, and its county, has the worst air pollution rating of any city\county in the U.S. I'm sorry, I don't have the numbers, though.