Urbanization and industrialization
The answer is smog
no
compost
You and your question!!!
Car pollution is a major problem in cities around the world. Large cities in China and India are suffering serious issues because of car pollution.
factories and cars
roadways
The largest source of human-caused air pollution is the burning of fossil fuels. 90% of air pollution is from power plants and automobiles.
77% i think
Uses of fuels in cars , industries , household activities , etc.
Mexico City and Sao Paulo are amongst the worst of the major world cities.
Major towns in Canada, such as Toronto, are cosmopolitan, and quite busy. Larger cities have more pollution, as well as traffic and people in general.