There is a polysilicon chemical plant near Marriott Greentown in Xuzhou, Jiangsu. Is it harmful to residents? What are the disadvantages? How far is the safe distance from the manufacturer?

At present, the improved Siemens process widely used in polysilicon plants adopts closed cycle, which is relatively safe because it will not discharge too many harmful substances to the outside world under normal circumstances. However, if it leaks, it will produce a lot of chlorosilane and dust, which may cause harm to the surrounding environment, but this rarely happens.