Question

(04.03r mc)
which of the following is true about sulfurous smog?
it exists in damp, cold weather.
it is formed from unburned hydrocarbons.
it creates a brown haze in the air.
it is formed from nitrogen oxides.

Explanation:

Sulfurous smog (also known as London smog) is associated with damp, cold weather. It is formed from sulfur oxides, not unburned hydrocarbons (which are related to photochemical smog) or nitrogen oxides (also photochemical smog - related). Photochemical smog creates a brown haze, while sulfurous smog is more of a grayish haze. So the correct statement is that it exists in damp, cold weather.

Answer:

A. It exists in damp, cold weather