Question

what is a pollution ? ​

Answer 1

Answer:

the presence in or introduction into the environment of a substance which has harmful or poisonous effects

Explanation:

Pollution is the introduction of harmful materials into the environment. These harmful materials are called pollutants. Pollutants can be natural, such as volcanic ash. ... Pollutants damage the quality of air, water, and land.

Answer 2

Answer:

Pollution is the introduction of harmful materials into the environment. These harmful materials are called pollutants.