If we try to investigate the major sour

It is important to point out that some pollutants originate from natural sources. For example, forest fires emit particulate and VOCs; ultra fine dust particles in the atmosphere. Finally, volcanoes give out sulfur dioxide and volcanic ash; a big volcanic eruption can darken the sky over a wide region and affect the earth's atmosphere. Unlike pollutants from human activity, however, naturally occurring pollutants remain in the atmosphere a short time and do not lead permanent atmospheric change.

Measures taken by the world towards Air Pollution

Globally the issue of pollution control has become a prime issue of control. In developed contras that have already gone threw a period of rapid industrialization measures are being taken to demand cleaner technologies. Last developed nations come hoping for economic growth are less enthusiastic about pollution controls. Inspite of that, several reported international agreements have been reached. In 1988, the United States and 24 other countries agreed in the long-range transboundary pollution agreement to hold their production of nitrogen oxides. In the Montreal protocol 1987, most nations agreed to reduce the manufacture of CFCs. In 1992 United Nations framework convention on climate change negotiated a treaty outlining cooperative effects to stop global warming. In December 1997 the third conference of the united nations frame work convention on climate change in Japan, more than 160 countries adopted a Kyoto protocol which called for reduction of green house gases by 5 percent.

2] Reducing the concentration of airborne lead in and near lead smelters.

ces of pollution, we realize that they stem out of human activities. Burning fossil fuels, natural gases, coal and oil, factories and motor vehicles all emit harmful substances. Among these harmful chemical compounds this burning adds to the atmosphere are carbon dioxide, carbon monoxide, nitrogen oxides, sulfur dioxide, and solid particles called particulate. Between 1900 and 1970 the use of motor vehicles expanded which resulted 690% increase in the damaging pollutants in vehicle exhaust. Another source of pollutant is the decomposing of garbage in landfills and solid waste disposal which emit methane gas, and many households products give off what is known as volatile organic chemicals (VOCs).

One type of air pollution is referred to as local and regional pollution, which take place in the lowest layer of the atmosphere, the troposphere. This layer is the one in which most weather occurs. /in the weather phenomenon known as thermal version, a layer of cooler air is trapped near the ground by a layer of warmer air above. When this happens pollutants are trapped in the lower layer, as an example of this is smog. Before the automobile, most smog came from the burning of coal; today the main source of smog is the burning of gasoline by motor vehicles. Smog contains ozone, which is a form of oxygen gas made up by molecules with three oxygen atoms rather than the normal two. Ozone in the lower atmosphere is poison since it destroys crops, kills trees an

Some common words found in the essay are:
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Approximate Word count = 2074
Approximate Pages = 8 (250 words per page double spaced)