"dirty air" is an acceptable and usable phrase in written English.
Example: The increased pollution in the city has caused the air to become dirty, making it hard to breathe.
Dirty air and water do not seem to bother Perry.
Dirty air, says the UN, causes the premature death of 400,000 Chinese each year.
It has also been blamed for poisoned wells and dirty air.
They must also reduce emissions that "contribute significantly" to another state's dirty air.
They feel menaced by rising crime, dirty air, and now by spiralling prices for vegetables.
The exact number of deaths caused by dirty air is unknown.
And around a third of the dirty air in Britain is swept across from Europe.
Mr. Leavitt said that county had dirty air because of mining near Libby.
This is the dirtiest secret about dirty air: the wealthy buy their way around it.
Dirty air, and the death and illness it causes, have become front-page news in India.
A further 1.3 million under-19s lived in close proximity to those areas with dirty air.
