1987 September 5. According to the data of People's Republic of China (PRC) Air Pollution Prevention Law, Article 8 1 stipulates that it is forbidden to build, rebuild or expand catering services that produce oil smoke, odor and waste gas in residential buildings, commercial and residential buildings without special flue and commercial floors adjacent to residential floors in commercial and residential buildings. Therefore, it can be seen that residents' shops have been unable to provide catering services since 1987.