The air pollution is so dangerousfor people in my area. There are two problems about causes and effects. About causes, fistly, many vihicles disdage dút and smoke into the enviroment. besides, factories dump waste poisonuos. Finaly people littering anywhere, such as parks, beaches, school and even on the way. About effects, firstly, people can suffer from many respiratory diseases. second, people can't living long because of lack of oxygen. And lát, it xill destory the ozone layer and make it easier from yhe sun rays to penetrate the Earth. In short, i think we should protect the ải's purity before it's too late.