Class 11 Chemistry Environmental Chemistry Environmental chemistry

Environmental chemistry

“It is a branch of chemistry that deals with the study of chemical phenomenon occupying in the atmosphere.”

Environmental pollution:

It can be defined as the “undesirable change in our surroundings that causes lot of harmful effects.”


The substances that are undesirable and cause lot of harm are called pollutants.

Atmospheric pollution:

  • There are different layers of atmosphere and the lower layer or region in which we live is known as troposphere.
  • Troposphere contains air, watervapor, clouds; dustetc. in this layer the cloud formation takesplace.
  • Atmospherepollution is mainly caused in troposphere and atmosphere.
  • The protective layer that is ozone which is found in stratosphere is adversely affected by pollutants and this layer is very important to us as it prevent the entry of ultra violet rays which otherwise can cause lot of diseases.

The major causes of pollution are:

  • Fast population growth
  • Rapid urbanization
  • Industrialization
  • Use of pesticides etc.


  • Note :There is a difference between a contaminant and a pollutant which as follows:-

Contaminant is not present in nature but is introduced into the environment by human activity

Pollutant is a substance that are produced either by natural source or by human activity and due to increase its concentration the harm is caused to living forms

Threshold limit valueis the permissible limit of a pollutant in atmosphere to which if a healthy worker is exposed for 8hours or 40 hours a week there is no effect on him.

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