Question

which is more harmful; photochemical smog or classic smog and give reason​

Answer 1

Answer:

Sulfurous smog results from a high concentration of sulfur oxides in the air

and is caused by the use of sulfur-bearing fossil fuels, particularly coal.

Photochemical smog, which occurs most prominently in urban areas that

have large numbers of automobiles, requires neither smoke nor fog. This

type of smog has its origin in the nitrogen oxides and hydrocarbon vapors

emitted by automobiles and other sources, which then undergo

photochemical reactions in the lower atmosphere.