Acid rain is now a worldwide problem. There were a lot of chemicals which had floated in the air. For example, So2, No2, Hg and VOC.... these chemical are mixed together in the air. That makes the air will be bad. scientists are reporting examples of its effects. In other areas., acid rain It may also be related to some human health problems. Acid rain is a form of both air and water pollution. Therefore poeple must begin to protect the wolrd and save themselves. The way to solve these problems. People must start making some filtrations to filtrate those chemicals.