air pollution can be seen in many parts of the world . m any people as well as scientists are aware of dangers it has brought to out human beings. nearly
everyone knows that air pollution irritates oureyes, causes us to cough and makes us get more serious diseases.
air pollution is not only dangerous to people but also detrimental to our surroundings and our daily life. it corrodes our buildings ,damages crops and
forests and causes both airplane and auto accidents because it cuts down visibility.
furthermore,the pollutants in the air may travel through the air with wind;as a result, air pollution can spread from city to city, even from country to
country. so air pollution is really a global problem.
as can be seen from the above dangers, air pollution costs our human beings a great deal of money. therefore, it must be worthwhile to spend more money and