II Differences in policies and regulations across different regions

（1） Different cities adapt to local conditions

Due to the varying environmental carrying capacity, population density, and scale of development of the catering industry in different cities, different regions have formulated differentiated regulations based on the implementation of national unified environmental protection policies. For example, as the capital, Beijing has extremely high requirements for environmental quality. In terms of emission standards for oil fume purifiers, in addition to strictly implementing the national emission limits for oil fume and non methane total hydrocarbons, it also emphasizes the stability and operational reliability of the equipment. Require catering enterprises to regularly maintain and upkeep their oil fume purifiers, and establish detailed operation records for environmental protection departments to inspect at any time.

In some tourist cities, such as Hangzhou, due to its numerous scenic spots, the requirements for air quality are more stringent. In addition to strict control over the purification efficiency and emission concentration of oil fume purifiers, special requirements have also been put forward for the appearance and installation location of oil fume purifiers to ensure that they do not affect the overall beauty and coordination of the scenic area. When operating in the scenic area, catering enterprises need to choose oil fume purifiers with simple appearance and integration with the surrounding environment, and install them in the designated location.

（2） Differentiated management of urban and rural areas

Considering the differences in development levels and environmental conditions between urban and rural areas, the 2025 environmental protection policy also reflects the characteristics of differentiated management between urban and rural areas in terms of emission standards for oil fume purifiers. In urban built-up areas, due to dense population and high environmental sensitivity, the emission standards for oil fume purifiers are most strictly enforced. In some towns and rural areas, although the overall standards are consistent with those of cities, a certain buffer period and guidance and assistance will be provided according to the local actual situation during the implementation process. For example, in some rural areas, environmental protection departments will organize professionals to provide guidance on the selection and installation training of oil fume purifiers for local catering merchants, helping them meet environmental standards as soon as possible. At the same time, for some small-scale and difficult to operate catering merchants, while meeting basic environmental requirements, regulatory standards should be appropriately relaxed to give them certain development space.