top-rated free essay

Pollution

By aam123 Sep 17, 2013 1523 Words
We keep our houses clean. We take utmost care of our bedroom, making sure no dust rests on our polished furniture. From walls to carpets, everything in our house is neat and clean and perfectly maintained. Then why do we fail to keep our environment clean; maintenance of which is far more vital as compared to our home? The term pollution means addition of any substance which alters the quality of the environment. Substances which cause pollution or alter the natural quality of the air, water and soil are called pollutants. Hence, pollution may be defined as the ‘contamination of the environment that causes harm to the health and survival of humans and other living organisms’. Therefore, there is a pressing need for all of us to develop and apply more efficient and environmentally suitable strategies for sustainable growth. Pollutants may be classified as solid (heavy metals, fertilizers, plastics, fibres, microorganisms); liquid (solvents, oil, pesticides, insecticides, effluents); gaseous (fumes, hydrocarbons, vapours, oxides of nitrogen and sulphur; carbon monoxide and carbon dioxide). Pollution can be broadly classified into five types:

i. Air pollution
ii. Water pollution
iii. Soil pollution
iv. Noise pollution
v. Radiation pollution
1. Air Pollution:
Air is perhaps the most vital element required for our survival. All living organisms, including human beings, cannot live without air even for a few minutes. Air consists of 78 per cent nitrogen, 21 per cent oxygen and 1 per cent of other gases, out of which carbon dioxide constitutes 0.3 per cent. It is shocking to know that the air we breathe in is full of impurities and is the cause of many diseases and malfunctioning of our system. An air pollutant is a substance present in the atmosphere in concentrations that disturb the natural equilibrium of the atmosphere and produces undesirable effects on humans and environment. There are several types of air pollutants. Some of them are not very harmful but others can be very dangerous and can have serious effects on man and his environment. In addition, pollutants can also be in the form of solid particles, liquid droplets or gases. Solids or liquids with size less than 100 microns that remain suspended in the air are called particulate pollutants, for example dust, smoke, fog, mist, bacteria and fumes. Gases such as CO, NH,, SOz, CO, NO, and H, S are continually released into the atmosphere through natural and chemical activities, are toxic and poisonous. Another classification of air pollutants can be either primary or secondary. The following are the primary pollutants that are emitted directly into the environment and contribute to more than 90 per cent of global air pollution: i. Carbon monoxide (CO)

ii. Nitrogen oxides (NOx)
iii. Hydrocarbons (HXCX)
iv. Sulphur oxides (SOx)
v. Particulates
Secondary pollutants are not emitted directly. Rather, they are formed as a consequence of interaction with primary pollutants, for example photochemical smog, which is a mixture of smoke and fog, sulphuric acid (acid rain), which forms when sulphur dioxide dissolves in rainwater, and nitric acid which forms when nitrogen dioxide dissolves in rainwater. 2. Water Pollution:

We all know water is essential for life. Water covers 71 per cent of earth’s surface and makes up 65 per cent of our bodies. Hence the quality of water is of vital concern for mankind since it is directly linked with human welfare. If water gets polluted, it disturbs the normal uses of water for survival of man, fishes, other aquatic and wildlife as well as for agriculture and industry. Polluted water is the cause of many waterborne diseases and epidemics, which are prevalent in many developing countries. Generally speaking, water pollution is defined as the state of deviation from the pure condition, which affects its normal functions and properties such that it becomes harmful if used by man, animals and aquatic life. Water pollution includes pollution of fresh water, marine water and groundwater. We all are aware of the signs of water pollution such as bad taste of drinking water, offensive odours from water bodies, and decline in number of fishes living in it and oil and grease floating on surface of water. The major sources of water pollution are domestic waste, which is discharged untreated into natural water bodies. Both organic and inorganic substances present in these wastes contaminate water. Hence the water pollutants are broadly classified as organic, inorganic and biological water pollutants. However, displacement due to development, as well as forest policies, has put Worlis to a lot of trouble. If, for some reasons, they are forced to leave the forests, all their indigenous knowledge would get lost to the world. Inorganic pollutants consist of inorganic salts, silt (sediment), mineral acids, finely divided metals and their compounds as well as complexes of metals with organics in natural water. Some large visible items polluting water may be termed as ‘floatables’ which include shipwrecks, marine debris and trash (paper, plastic and food waste). Biological pollutants include pathogens like bacteria, viruses, protozoa, algae and worms. Water pollution is harmful to both fresh water as well as marine water. Freshwater Pollution:

Our major source of fresh water is groundwater. It is needed for drinking purposes, for irrigation and in industry. When rain falls, rainwater passes through different layers of soil. This natural filtration purifies it and makes it fit for human consumption. Snow-fed rivers, rain-fed lakes and ponds are included as freshwater bodies. Contamination of fresh water is due to the following reasons: i. Seepage of pesticides and fertilizers into groundwater.

ii. Flow of hazardous chemical paste from industries into streams, rivers and ponds. iii. Flow of domestic sewage into freshwater bodies.
iv. Thermal power plants and many industries discharge hot water into freshwater bodies. This affects the aquatic organisms and disturbs the aquatic ecosystem. v. Eutrophication caused by the chemical effluents discharged into the water body. Marine Water Pollution:

Pollution of seas and rivers is caused by the rivers that dump millions of tonnes of wastes into them. Rivers carry agricultural, industrial and domestic wastes into the seas. Activities along coasts and at seaport cities also generate industrial waste which is often dumped into the seas. Oil spills and oil leaks are a major cause of marine pollution. Layers of soil on seawater surface destroy aquatic life, as well as bird life that feed on aquatic animals. 3. Soil Pollution:

Soil is the uppermost layer of the earth crust which is formed by weathering of the rocks. The top soil is fertile and is a storehouse of microorganisms (bacteria and fungi) and organic matter (humus). Soil pollution refers to contamination of soils with materials or chemicals released by spill or underground leakage that makes it unfit for productivity. Soil pollution can also lead to water pollution when toxic chemicals leach into the groundwater and further to other water bodies. It also adds to air pollution by releasing the volatile compounds into the atmosphere. Both organic and inorganic contaminants contribute to soil pollution. Among them, the most important organic soil contaminants include aromatic and chlorinated hydrocarbons, detergents and pesticides. Inorganic contaminants include heavy metals such as nickel, arsenic, cadmium, chromium, lead, inorganic acids, nitrates and phosphates and radioactive substances from nuclear wastes and radioisotopes. Pollution of soil is most commonly caused by discharge of industrial and man-made waste materials into the soil, such as non-biodegradable plastics, application of pesticides, dumping of oil and fuel; radioactive fallout and percolation of contaminated water into the soil. With increasing population, the accumulation of municipal waste has increased tremendously. This waste is dumped in landfills near cities and towns. Along with biodegradable waste such as paper, cloth, vegetable, etc., a great deal of non-biodegradable waste is also dumped into the soil. These include plastics, polythene bags, glass bottles, hospital wastes such as needles and surgical equipment, tin, cans, etc. The natural decomposers in the soil are not able to decompose large amounts of waste, especially as it includes non-biodegradable items. 4. Radiation Pollution:

Radiation pollution is any form of ionizing and nonionizing radiations that results from human activity. These radioactive pollutants are produced by nuclear explosions, war explosives, nuclear power generation, spent-fuel reprocessing plants, by-products of mining operations and research laboratories. Radioisotopes are also used for medicines and diagnostic purposes. Radiation pollution can have a long-term effect on the environment and increased exposure to radiation causes skin burns and cancer. It is therefore, essential to control these radioactive emissions into the environment. 5. Noise Pollution:

Unpleasant sound that disrupts the concentration of an individual and leads to irritable behaviour can be termed as noise pollution. Noise today has become an indispensable part of our environment, which is increasing in volume every day. Industrialization and technological progress are adding to the problem of noise pollution. Vehicular traffic which makes tremendous noise on the roads, machines that make loud noise and blaring loudspeakers are adding to the level of noise in our environment. Excessive exposure to noise pollution causes hearing problems, hypertension, restlessness, irritability and stress. Major contributors to noise pollution are vehicles, aircraft, railways, machines used for construction and sirens. -------------------------------------------------

Top of Form

Cite This Document

Related Documents

  • Pollution

    ...http://eschooltoday.com/pollution/noise-pollution/sources-of-noise-pollution.html Environmental pollution is one of the biggest problems the world faces today. It is an issue that troubles us economically, physically and everyday of our lives. The contamination of the environment is also being linked to some of the diseases that are around c...

    Read More
  • pollution

    ...Pollution is the introduction of contaminants into the natural environment that cause adverse change. Pollution can take the form of chemical substances or energy, such as noise, heat or light. Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants. TYPES OF POLLUTION Water Po...

    Read More
  • The Causes of Pollution

    ...The causes of pollution Pollution is the release of harmful environmental contaminants. The main air pollutants are carbon monoxide, lead oxides, sulfur dioxide and nitrogen oxides. The principle causes of pollution are exhaust pipes from motor vehicles, smoke released by factories and moreover, industrial plants burn coal and oil, which co...

    Read More
  • environmental pollution

    ...ENVIRONMENTAL POLLUTION Environmental pollution is one of the biggest problems the world faces today. It is an issue that troubles us economically, physically and everyday in our lives. Pollution is the introduction of contaminants into the natural environment that causes adverse change. Pollutants, the components of pollution, can be either fo...

    Read More
  • Development of Tourism Cause Pollution

    ...pollution because of tourism Tourism can cause the same forms of pollution as any other industry: air emissions, noise, solid waste and littering, releases of sewage, oil and chemicals, even architectural/visual pollution. Air pollution and noise Transport by air, road, and rail is continuously increasing in response to the rising numbe repor...

    Read More
  • Industrial Pollution

    ..."Pollution affects two essential aspects of our planet: air and water. Although their pollutants are emitted in different ways, they both harm all living organisms. Air pollution is predominately emitted through the exhaust of motor vehicles and the combustion of fossil fuels, whereas water pollution is the result of industrial waste and environ...

    Read More
  • Air Pollution

    ...even someone smoking a cigarette can also cause air pollution. | | |The gaseous composition of unpolluted air | |  ...

    Read More
  • Air Pollution Essay - 1

    ...Title : AIR POLUTION Air Pollution is anything that goes into the air that is harmful. Most air pollution is manmade. The largest contributor to air pollution is the burning of fossil fuels such as gas and coal. Air pollution can also be said is the accumulation in the atmosphere of substances that, in sufficient concentrations, endanger h...

    Read More

Discover the Best Free Essays on StudyMode

Conquer writer's block once and for all.

High Quality Essays

Our library contains thousands of carefully selected free research papers and essays.

Popular Topics

No matter the topic you're researching, chances are we have it covered.