Answer:
the level of pollution at which the marginal social cost of pollution is equal to the marginal social benefit of pollution.
Step-by-step explanation:
Pollution can be defined as the physical degradation or contamination of the environment through an emission of harmful, poisonous and toxic chemical substances.
Generally, it has been proven beyond reasonable doubt that pollution is undesirable to living organisms such as humans, plants and animals in an environment.
Furthermore, we know and agree that social welfare of the people living across the world is increased by reducing pollution.
Hence, the optimal level of pollution in a society is the level of pollution at which the marginal social cost of pollution is equal to the marginal social benefit of pollution.