APP Recently,haze weather has become a daily one right here in large part of China.People are forced to wear the mask to avoid breathing poisonous air.So it is necessary to find out the reason why leads to that and work out the resolution.If we trace the cause for haze weather ,the main points are as follows ,first,china ‘s air quality standards are rather lax and evaluation factors are limi （共 1788 字） [閱讀本文] >>
