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The addition of constituents to water, air or land, which adversely alter the natural quality of our environment is known as Pollution. 
Pollution may also be defined as an undesirable variation in the physical, chemical or biological characteristics of our water, air and land that may or will harmfully affect human life or that of desirable species, our industrial processes, living conditions and cultural assets, or that may or will waste or deteriorate our raw material resources. 

Global Aspect of Pollution 

Entire world can be considered as a single vast ecosystem of the universe consisting of two parts:

(I) Biotic Community (or Living Part) 
That is, the Biosphere in which life exists. The lack of living creatures and dis-balance in their life balance, gives rise to the crises in biological community.

(II) Abiotic Community (or Non-Living Part of Physical Environment) 
The abiotic or physical environment of all organism existing on the earth exists in three zones: Atmosphere, Lithosphere, and Hydrosphere. 

Causes of Environmental Pollution 

The root cause of environmental pollution has been men's behave with the nature. Albeit, there are several reasons for environmental pollution, for example: 

A. Harmful Gases in the Atmosphere 

The concentration of harmful gases is increasing day by day in the atmosphere. Increasing Carbon dioxide content will warm up the earth atmosphere to such an extent that it will melt the polar ice and will cause a subsequent rise in sea level. Thus low line areas will be submerged, carbon dioxide is harmful to our health. Carbon mono-oxide, Sulpur dioxide, Hydrogen sulphide, Nitrogen oxide, Ozone etc also constitute the other harmful pollutant. 

B. Industrial Waste (Effluents) 

Discharge of untreated industrial effluents (for example Breweries, Tanneries, Dying, Textile and Paper can cause very serious pollution indeed. 

C. Swage and Domestic Wastes 

Dumping of tonnes of sewage, dead humans and animals and domestic wastes from cities into the water reservoirs are one of the major causer of water pollution. Discharge of untreated or partially treated sewage may cause: (a) depletion of oxygen content caused by biological oxidation of organic matter; and (b) stimulation of algae growth. 
The above effects affects the diverse uses of water. 

D. Insecticides and Pesticides 

Insecticides used to kill insects which destroys (damages) our corps, spread several diseases in man, after spraying are washed off to the rivers and lakes and become a part fish body and other animal there. In the same way pollution of food grains by insecticides and pesticides and the various diseases caused by such food grains are also well known. 

E. Automobile/Factory Exhausts 

The air becomes foul by the exhaust from the internal combustion engines of automobiles used for personal conveyance, transport of goods and passenger traffic in the modern world. This polluted air is unhealthy for human and animal. Carbon monoxide is a deadly poisonous gas discharged from the automiles and factories is a serious problem in big cities of the world. It causes headaches, loss of vision, nausea, pain, convulsions, asthmatic spasm etc. 

F. Fertilizers and Detergents 

Fertilizers applied in the fields are also washed off into streams, rivers and the seas. Here they increase the growth of algae (algae is a microscopic green plan). This algae consumes the oxygen of water much more then they returned to water in dissolved state (during photosynthesis). In short supply of oxygen the animal living in water become suffocated.
Detergents also causes a serious problem to the fresh water resources. Major ingredients of most detergents are phosphates. When discharged into water they support luxuriant growth of algae. 

Different types of pollution 

Pollution can be classified mainly on the basis of (i) Environmental (water, soil and air etc.); and (ii) Pollutants (lead, carbon-dioxide, solid waste etc.). On the basis of these two ways pollution may be classified as: 
  1. Air Pollution
  2. Mercury Pollution
  3. Noise Pollution
  4. Pesticide and Herbicide Pollution
  5. Radioactive Pollution
  6. Soil Pollution
  7. Thermal Pollution
  8. Water Pollution

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