|Class 11 Chemistry Environmental Chemistry||Environmental chemistry|
“It is a branch of chemistry that deals with the study of chemical phenomenon occupying in the atmosphere.”
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.
The major causes of pollution are:
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.