Ozone is produced by cars and trucks in exhaust.
It is considered a pollutant, since it harms the
eyes and the lungs. It is known to cause
irritation and stinging in the eyes and coughing.
Some people believe that high ozone concentrations
in the air can make asthma symptoms worse in
people who suffer from lung problems, and over
long times can cause lung cancer. Because it is
one of the more harmful pollutants, emissions of
ozone from automobiles are monitored and regulated
by the EPA, just as carbon monoxide and other
dangerous gases are regulated. Ozone pollution is
usually only a problem in large, congested cities
with lots of traffic.
Ozone produced as a
pollutant cannot protect us from UV exposure since
UV rays reach us from above, and ozone and other
pollutants are produced close to the ground and
disperse rapidly. The amount of ozone produced by
pollution is much much less than the amount
required to absorb harmful UV rays from the sun,
and much less than the amount of "good ozone" in
the upper atmosphere destroyed by CFC's every
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