How does forest conservation help to reduce air pollution?

Explanation

(i) The alteration or changes in the composition of the earth.s atmosphere by natural or human activities is called air pollution.
(ii) Increase in carbon dioxide concentration of air is also a form of air pollution. The normal `CO_(2)` concentration in the atmosphere is only about 0.03%. Deforestation is one of the major contributions for increase in carbon dioxide of the air. Forests act as carbon sink by utilising the atmospheric carbon dioxide for photosynthesis.
(iii) When forests are cut down, the concentration of the atmosphere increases. This leads to global warming or green house effect which is an effect of air pollution.
(iv) Thus by forest conservation, we can reduce the carbon foot print by increased trapping of atmospheric `CO_(2)` and thereby reducing global warming. This leads to reduced levels of air pollution.