refers to the ratio of the amount of pollutants such as sulfur dioxide and nitrogen oxides discharged into the air during the operation of catering industry to the amount of catering services.

According to the academic research of Baidu and the literature "Characteristics of Mass Concentration, Chemical Composition and Emission Factors of Organic Particulate Matter from Catering Industry", it is known that the emission factor of dioxygen in catering industry refers to the ratio of the amount of pollutants such as sulfur dioxide and nitrogen oxides discharged into the air during the operation of catering industry to the amount of catering services. This ratio can be calculated by monitoring the exhaust emission data and catering service volume of the catering industry, and it is one of the important indicators to evaluate the environmental pollution degree of the catering industry. The level of dioxygen emission factor in catering industry reflects the pollution degree of catering industry to the environment, which has an important impact on environmental protection and public health. Therefore, the catering industry needs to take measures, such as using clean energy, strengthening waste gas treatment, etc., to reduce the dioxide emission factor and protect the environment and public health.