Photochemical Smog

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Term Paper Title	Photochemical Smog
# of Words	1635
# of Pages (250 words per page double spaced)	6.54

Photochemical Smog

Photochemical Smog

Gifted Chemistry IB
Alternative Assessment
1997 March 19

Historically, the term smog referred to a mixture of smoke and fog, hence the
name smog. The industrial revolution has been the central cause for the increase
in pollutants in the atmosphere over the last three centuries. Before 1950, the
majority of this pollution was created from the burning of coal for energy
generation, space heating, cooking, and transportation. Under the right
conditions, the smoke and sulfur dioxide produced from the burning of coal can
combine with fog to create industrial smog. In high concentrations, industrial
smog can be extremely toxic to humans and other living organisms. London is
world famous for its episodes of industrial smog. The most famous London smog
event occurred in December, 1952 when five days of calm foggy weather created a
toxic atmosphere that claimed about 4000 human lives. Today, the use of other
fossil fuels, nuclear power, and hydroelectricity instead of coal has greatly
reduced the occurrence of industrial smog. However, the burning of fossil fuels
like gasoline can create another atmospheric pollution problem known as
photochemical smog. Photochemical smog is a condition that develops when primary
pollutants (oxides of nitrogen and volatile organic compounds created from
fossil fuel combustion) interact under the influence of sunlight to produce a
mixture of hundreds of different and hazardous chemicals known as secondary
pollutants. Development of photochemical smog is typically associated with
specific climatic conditions and centers of high population density. Cities
like Los Angeles, New York, Sydney, and Vancouver frequently suffer episodes of
photochemical smog.

One way in which the production of photochemical smog is initiated is through
the photochemical reaction of nitrogen dioxide (NO2) to form ozone. There are
many sources of photochemical smog, including vehicle engines (the number one
cause of photochemical smog), industrial emissions, and area sources (the loss
of vapors from small areas such as a local service station, surface coatings and
thinners, and natural gas leakage).

Vehicle engines, which are extremely numerous in all parts of the world, do not
completely burn the petroleum they use as fuel. This produces nitrogen dioxide
which is released through the vehicle exhaust along with a high concentration of
hydrocarbons. The absorption of solar radiation by the nitrogen dioxide results
i...

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