What complaints do hotels fear most will lead to closure for rectification?

Illegal emission of smoke and dust; Hygiene is not up to standard, fire fighting is not up to standard, and kitchen is not up to standard; Illegal building. According to the inquiry of China Travel Service. If the hotel illegally discharges oil fumes or fails to meet the hygiene standards, fire protection standards, unqualified kitchens or illegal buildings, the hotel will be closed for rectification, and the hotel is most afraid of such complaints.