Acid rain is a general phrase meaning acid falling from the atmosphere.
More accurately called acid deposition. There are two types of acid deposition, wet and dry. Dry deposition refers to acidic gases. Nearly half of acid deposition is dry. This may deposit itself on your car, street, house, or even you, and during any type of rainstorm, is washed away into your lawn where grasses use the water, into your flower bed, where flowers use the water, into a stream, where fish take in the water.