Question

Question 25
Low visibility during cold weather is due to

(a) formation of fossil fuel
(b) unburnt carbon particles or hydrocarbons suspended in the air
(c) lack of adequate power supply
(d) none of these

Answer 1

(b) unburnt carbon particles or hydrocarbons suspended in the air

The combustion of fossil fuels increases the number of suspended particles in the air. These suspended particles could be unburnt carbon particles or substances called hydrocarbons. Presence of high levels of all these pollutants causes visibility to be lowered, especially in cold weather when water also condenses out of the air. This is known as smog and is a visible indication of air pollution.