In the eyes of many people, the cement company is full of dust, thick smoke is billowing from the sky, and the workers are wearing masks to work, all of them are dusty. In the cold winter season, walking in the factory area of Hebei Jinyu Dingxin Cement Co., Ltd., despite the wind and snow, there is no flying dust, no smoke can be seen from the chimney, clean and tidy roadside, in the woods, the data on the online monitoring instrument beats from time to time, and the particulate matter emission