according to the scale of the catering industry, it is divided into large, medium and small, and the minimum removal efficiency of the oil fume purifier is 61%, 75% and 85% respectively, while the maximum allowable emission concentration is 2.1mg/m3, which is mainly aimed at the oil fume emission management of the existing catering industry units and the design and environmental impact assessment of the newly established catering industry units. The staff canteens in food processing units and non-operating units that emit lampblack have no requirements for the emission of lampblack in households. These two standards are aimed at the requirements of lampblack purifier for lampblack treatment, but there is no clear regulation on taste.