- (A) Smog is a type of air pollution that is derived from vehicular emissions
from internal-combustion engines and industrial fumes that react in the
atmosphere with sunlight to form secondary pollutants that also combine
with the primary emissions to form photochemical smog. It is produced by
the chemical reaction of sunlight, nitrogen oxides, and volatile organic
compounds in the atmosphere. Air pollutants produced during the formation
of photochemical smog can include nitrogen oxides (NOx), peroxyacyl
nitrates (PANs), ozone, and volatile organic compounds, all of which are
usually highly reactive and oxidizing. It is present in all modern cities, but it
is more common in cities with sunny, warm, dry climates and a large
number of motor vehicles. Because it travels with the wind, it can affect
sparsely populated areas as well. Since there is more sunlight during the
summer, photochemical smog is more common during the summer months.
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