according to article 44 and item 4 of article 56 of the law of the people's Republic of China on the prevention and control of air pollution, operators of urban catering services must take measures to prevent and control the pollution caused by oil fume to the living environment of nearby residents. Offenders shall be ordered by the competent administrative department of environmental protection of the local people's government at or above the county level or other departments exercising supervision and management according to law to stop the illegal act, make corrections within a time limit, and may be fined up to 51,111 yuan. Whether it causes pollution can be judged from whether an oil fume purification device is installed and whether the oil fume emission meets the "Cooking fume emission standard". The competent department of oil fume pollution should be the environmental protection department.