pollution

Topics: Pollution, Air pollution, Light pollution Pages: 6 (1704 words) Published: January 24, 2014
POLLUTION
Pollution is when something is added to the environment that is harmful or poisonous to people, animals and other living things.in other words pollution is the contamination of the environment. Pollutants

The agents or substances that cause pollution are called the pollutants. The major pollutants are sulphur dioxide, oxides of nitrogen, suspended particulate matter, smog, ozone, carbon monoxide etc.. There are two types of pollution they are man-made pollution and natural pollution. Man-made pollution- it is the pollution caused by man. the pollutants that cause man made pollution are smoke from the factories, sewage in drinking Natural pollution-it is the pollution caused bye nature itself. wind born smoke and particulates from such natural events as plain and forest fires, volcanic ash, sand and dust which can spread over a large area of the country side. Any change in the physical, chemical and biological quality of air, water and land is called environmental pollution. The types of environmental pollution are

Air pollution
Water pollution
Soil pollution
Thermal pollution
Noise pollution
Light pollution
Air pollution is the contamination of air by smoke and harmful gases, mainly oxides of carbon, sulphur and nitrogen.Air pollution causes green house effect global warming and the ozone hole. Green house effect: The phenomenon whereby the earth's atmosphere traps solar radiation, caused by the presence in the atmosphere of gases such as carbon dioxide, water vapor, and methane that allow incoming sunlight to pass through but absorb heat radiated back from the earth's surface. Global warming: a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants. Causes of air pollution

Air pollution is caused by vehicles, industries, brick kilns, burning of garbage •Brick klins emit smoke
Burning of garbage releases smoke in to the air
Exhuast fumes from vehicles
The burning of fossil fuels, such as coal, oil or gas
Effects of air pollution:
1.Air pollution affects respiratory system causing breathing difficulties and diseases such as bronchitis,asthma,lung cancer,tuberculosis and pneumonia. 2.Air Pollution affects the central nervous system causing carbon monoxide poisoning.this causes suffocation 3.It causes acid rain which damages crop plants,trees,buildings,monuments,statues and metal structures and also makes the soil acidic. 4. Air pollution from certain metals,pesticides and fungicides causes serious ailments. Prevention And Control of Air Pollution

1.Combustion:This technique is applied when the pollutants are organic gases or vapours.The organic air pollutants are subjected to 'flame combustion or catalytic combustion' when they are converted to less harmful product carbon dioxide and a harmless product water. 2.Absorption:In this method, the polluted air containing gaseous pollutants is passed through a scrubber containing a suitable liquid absorbent.The liquid absorbs the harmful gaseous pollutants present in air. 3.Adsorption:In this method,the polluted air is passed through porous solid adsorbents kept in suitable containers.The gaseous pollutants are adsorbed at the surface of the porous solid and clean air passes through. 2. Fabric Filters:The particulate matter is passed through a porous medium made of woven or filled fabrics. 3. Wet Scrubbers:They are used to trap SO2,NH3 and metal fumes by passing the fumes through water. 4. Electrostatic Precipitators:When the polluted air containing particulate pollutants is passed through an electrostatic precipitator,it induces electric charge on the particles and then the aerosol particles get precipitated on the electrodes. Some other methods of controlling Air Pollution:

1.Tall chimneys should be installed in factories.
2.Better designed equipment and smokeless fuels should be used in...
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