Pollution

/pəlˈuːʃən/

/pəˈɫuʃən/

Pollution

a change in water, air, etc. that makes it harmful or dangerous

the act of contaminating or polluting; including (either intentionally or accidentally) unwanted substances or factors

the state of being polluted

synonyms : befoulment

Examples

1. Pollution is a major threat to our environment.

2. Environmentalists study the impact of pollution on different types of ecosystems.

3. The politician's off-the-cuff remark about pollution stirred up a hornet's nest among environmentalists.

4. We must protect the environment against pollution.