Legal analysis: It is stipulated that operators of urban catering services must take measures to prevent and control the pollution caused by oil fumes 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". It can be seen that the competent department of oil fume pollution should be the environmental protection department.

Legal basis: Law of the People's Republic of China on the Prevention and Control of Air Pollution

Article 44 Where raw materials and products containing volatile organic compounds are produced, imported, sold and used, the content of volatile organic compounds shall meet the quality standards or requirements. The State encourages the production, import, sale and use of organic solvents with low toxicity and low volatility.

article 56 the competent department of ecological environment shall, jointly with relevant departments such as transportation, housing and urban construction, agricultural administration, water administration, etc., supervise and inspect the emission of air pollutants from non-road mobile machinery, and those whose emissions are unqualified shall not be used.