(iii) From the ecosystem point of view, i.e., according to their natural disposal, pollutants are of two types:
(a) Bio–degradable Pollutants:
| Atmosphere and Air pollution | |
| Primary and secondary Air Pollutants | |
| Pollution and their effect on Human being |
These are the pollutants that are quickly degraded by natural means. Heat or thermal pollution, and domestic sewage are considered in this category as these can be rapidly decomposed by natural processes or by engineered systems such as municipal treatment, plants etc.
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