Grammar fix

air pollution

dirty air

When the air is made dirty or harmful by things like smoke, chemicals, or dust, often from cars, factories, or burning things.

collocationB1common

Hear it in context

Notice where the phrase sounds natural.

Air pollution in big cities can make it hard to breathe, especially for children and older people.environment
In my opinion, air pollution is one of the most serious problems in modern cities because it affects people's health and the environment.IELTS speaking

Pattern: air pollution (uncountable noun)

WrongThere are a lot of air pollutions in the city.

RightThere's a lot of air pollution in the city.

'Air pollution' is uncountable — no plural, no 'a'.

Patternair pollution (uncountable noun)

Choose the version that sounds natural in speech.

Stiff Atmospheric contamination poses a risk to respiratory health.

Natural Air pollution's bad for your lungs.

'Atmospheric contamination' is technical; 'air pollution' is the normal term.

Words that usually travel with it.

Not the same as 'pollution' in general, which can also mean dirty water or land.