The cause of the haze
There are many reasons for the formation of haze, among them, as far as I\'m concerned, there are five cases playing more important roles than others.
First of all, the atmospheric air preure is low and the air doesn’t flow, so that the small particles in the air are all accumulated, and then they will be floating in the air.This is the main factor of all.
Second, there are a lot of dust on the ground and the air humidity is low, people and traffic flow make the dust stirred up.
Third, automobile exhaust is the main pollutant emiions, in recent years, since the number of the cars has increased largely in the city , automobile exhaust emiion is gradually becoming one of the main factors in the formation of haze. The fourth reason lies in those factories which produce pollution.At last, winter heating has increased CO2 emiions and other pollutants.In most northern cities, the winter heating is inevitable, for which we are obliged to burn more fuel.As we all know，the energy we used mainly derived from non-renewable resources such as oil, coal and natural gas.Burning coal will lead to air pollution and endanger public health.the situation in some northeastern cities is even worse , where people have to suffer from serious haze problem.
Heave Haze in Beijing 讨论北京雾霾的英语小作文
