ENVIRONMENTAL POLLUTIONRameshwar singh jayas / October 12, 2018
Environmental pollution is defined as an undesirable change in physical,chemical and biological characteristics of air ,water and soil which creates a potential health hazards to living organisms and harmfully affect life.
Any change in the environment which contributes to it’s deterioration is called pollution.
ENVIRONMENTAL POLLUTION …
WHAT IS POLLUTANTS?
Any substance present in environment in harmful concentration which adversely affect the environment.
CLASSIFICATION OF POLLUTANTS:-
The pollutants can be classify on different basis such as:-
1) DEPENDING UPON THEIR EXISTENCE IN NATURE-
*Qualitative pollutants- They are those pollutants which are not normally occur in nature but are added by humans,e.g. Industries.
*Quantitative pollution- These are normally present in the environment which acquire the status of a pollutant when their concentration gets increased due to human activities.
e.g. Carbon dioxide if present in the atmosphere in conc. greater than normal due to automobiles and industries causes major affect on humans,plants and properties then it is classified as quantitative pollutants.
2) DEPENDING UPON THE FORM IN WHICH THEY ARE RELEASED IN ATMOSPHERE:-
*Primary pollutants- These are emitted directly from the sources and persist in the form in which they were added in the environment.
e.g. Fuel, Smog, CO2, Hydrogen, e.t.c.
*Secondary pollutants- They are formed from the primary pollutants by chemical interaction with some constituent present in the atmosphere.
e.g. Oxides of Nitrogen and Hydrocarbons are two primary pollutants released from automobiles but in presence of sun light, they react to form Peroxyacyl Nitrate (PAN) and Ozone to secondary pollutant which are more toxic than the primary pollutants.
This phenomenon of increased in toxicity by chemical interaction among the pollutants is known as “SYNERGISM”.
3) FROM ECOSYSTEM POINT OF VIEW:-
*Biodegradable pollutants-These are the pollutants which are quickly degradable by natural means.
*Non-Biodegradable pollutants- These are the substances that are either do not degradable or degrade very slowly in the natural environment
e.g. DDT, Aluminium cans, etc.