pollution

Definition

noun

(Environment)
the presence of unusually high concentrations of harmful substances or radioactivity in the environment, as a result of human activity or a natural process such as a volcanic eruption

Examples In terms of pollution, gas is by far the cleanest fuel. • Pollution of the atmosphere has increased over the last 50 years. • Soil pollution round mines poses a problem for land reclamation.
the unwanted presence of something such as noise or artificial light