Trophosperic Ozone Essay

This essay has a total of 1013 words and 7 pages.

Trophosperic Ozone

The source of the tropospheric ozone
The tropospheric ozone has two major sources. One is intrusion from the stratosphere. Most
of ozone in the atmosphere is in the stratosphere and created from solar UV radiation. The
stratospheric ozone sometimes flows into the troposphere by the upper layer trough and
cut-off low activities. Some part of ozone may subside in the troposphere directly by the
Hadley circulation or the Brewer Dobson circulation.

Another source is production from photochemical reactions. Ozone is produced from
relatively longer-wavelength solar radiation under NOx and non-methane hydrocarbons rich
environments. These photochemical reactions possibly bring about photochemical smog in
urban area.


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The characteristics of the tropospheric ozone
About 8 % of the total column ozone is in the troposphere. The tropospheric ozone also
plays an important role in the atmosphere.

1) Ozone is a green house gas and possibly contributes to the global warming.
2) Ozone is harmful for human being and crops in the troposphere.
3) Ozone oxidizes many chemical substances in the troposphere, and controls tropospheric chemistry.
The trend of the troposheric ozone
Some global monitoring stations show the increase of ozone in the troposphere. It may be a
big problem, because if tropospheric ozone increases, it might damage to human beings and
many crops, and fairly contribute to the global warming and change the tropospheric
chemistry. If the tropospheric chemistry changes, the nature of pollution and acid rain
might change.

But not all monitoring stations show the increasing trend. We have to monitor the
tropospheric ozone at many suitable observation points. This also has the mean to study
influence of human activities on Nature.

Causes of ground-level ozone
Other culprits-besides car and truck exhaust-are gas lawn mowers, over-filling and
topping-off a gas tank, which allows vapors to escape, and leaking fuel, which react with
sunlight and heat to produce ozone. Alternatives that reduce air pollution and
ground-level ozone include using native plants for landscaping rather than a lawn, using
an electric or push mower, limiting planting areas for lawns, carpooling and public
transportation.


Effects on people with preemptive respitoary problems
Ground-level ozone can cause flare-ups of asthma, chronic bronchitis, other lung diseases
and cardiorespiratory illnesses. Symptoms may take days to appear following exposure.
Ground-level ozone can decrease lung function and cause chest tightness and coughing. In
addition, ozone and microscopic particulates, small enough to be inhaled into the lungs
and "sticky" enough to attract pollens and other allergens, can contribute to asthma and
allergy attacks, and make other lung diseases more severe.


Things that can be done to lower the risk?
When ground-level ozone levels are high--in the 101-150 air quality index (AQI) range and
above--children and people with respiratory diseases are at risk. Stay indoors if you're
able. If not, don't exert yourself when outdoors; walk don't run. If you exercise, do so
in the morning or evening, when ground-level ozone numbers tend to drop. Be aware of high
pollution days, check the Environmental Protection Agency and your local health
department's Web sites for air pollution levels, avoid congested areas where pollution
accumulates, use public transportation and carpool.





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