• Pollution is defined as ‘an addition or excessive addition of certain materials to the physical environment (water, air and lands), making it less fit or unfit for life’.

• A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
• They are constituent parts of the pollution process. They are the actual “executing agents” of environmental pollution. They come in gaseous, solid or liquid form.

Classification of pollutant on disposable nature

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