Pollution
/pəˈluʃən/
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Definition
(noun) Physical contamination, now especially the contamination of the environment by harmful substances, or by disruptive levels of noise, light etc.
Sentence Examples
Because of the problem of air pollution, the bicycle may some day replace the automobile.
Environmental pollution is causing abnormal weather conditions.
CEFR Practice Quiz
The city introduced a congestion charge to reduce traffic and lower air ____ in the center.