Pollution is an infection of various pollutants caused by chemical subtances, noise, smoke, heat, light, energy, dust, waste materials and others into the environment which result in deleterious effects of such a nature as to endanger human health, harm living resources and ecosystems.

Ans you received from other lot but here are the ways how you can contribute to reduce;

About half of the air pollution comes from cars and trucks. Two important ways to reduce air pollution are to drive less -- even a little less -- and to drive smart. Taking fewer trips in your car or truck helps cut air pollution. And adopting smart driving habits reduces your car's emissions.

Driving less doesn't mean you have to stay home. Try combining driving with alternative modes of transportation:

Carpool.
Walk or ride a bicycle.
Shop by phone or mail.
Ride public transit. ...more

Disturbance caused to the atmosphere by smoke of vehicles and co2

Corrupting the atmosphere by adding smoke, dust, spitting , urinating in public, using high sound horns etc which in turn affects the living things and beings.

Pollution means violating NATURAL condition. It may be through air,water,sound,land etc.

Disturbance caused to the atmosphere by smoke of vehicles and co2.