The main AIR POLLUTERS are cars, buses and planes which EMIT smoke and gases into the air. TOXIC FUMES mix up in the atmosphere making it ACID and later land on grass, trees, and buildings in the form of rain, fog, or SLEET. We should REDUCE air pollution that causes acid rains.
1) air polluters
2)emit
3)acid
4)sleet
5) toxic fumes
6)reduce