What characterises "Los Angeles smog"?

Question

AHydrocarbons and smoke

BWater and hydrocarbons

CWater, hydrocarbons and soot particles

DNitrogen oxides, hydrocarbons and ozone

Select from the options above.

Correct Option: 4  

Explanation:
Nitrogen oxides, hydrocarbons and ozone
This photochemical smog is most prominent in urban areas that have large numbers of automobiles, and causes a light brownish coloration of the atmosphere, reduced visibility, plant damage, irritation of the eyes, and respiratory distress. Los Angeles was particularly prone to the smog because of its high population of cars in its mountain-surrounded valley; tight restrictions on emissions levels for all new cars sold in California and mandatory regular emission tests of older vehicles has substantially eased the problem.