Question

what is air pollution?​

Answer 1

Answer:

the presence in or introduction into the air of a substance which has harmful or poisonous effects

Answer 2

Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen and mold spores may be suspended as particles. Ozone, a gas, is a major part of air pollution in cities. When ozone forms air pollution, it's also called smog.