How does smog effect Biological world? Which source of energy can easily replace the use of Wood in Rural areas?

Explanation

(a) Smog is the dark fog having condensed water vapours, dust, smoke and gases like `SO_2, H_2S, NO_2` etc. It causes silvering/glazing and necrosis in plants, Allergies and bronchitis and Asthema in humans.
(b) Alternative fuels. Solar energy, wind energy, CNG Biogas.