The business types in Houston hate health advisories and anything else that calls attention to the city's dirty air.

It's more important to clean up the pollution causing the dirty air.

She dropped onto the rim rock, choking on the dirty air.

"They shouldn't do that," he said, "there's not a huge amount of dirty air."

Everything I have seen on the problem of dirty air seems to ignore one very important fact.

Is it possible that breathing dirty air added to the condition of the lungs?

But they warn that the dirty air from Asia could increase with rapid industrial growth in the region.

The free market fix for dirty air was rotten from the first deal.

Both are well adapted to London's dry climate and dirty air.

If Hapd'efan'e is right about dirty air, then he's not going to get much better as this campaign goes on.