The net oil-free fumigation alliance, and the net oil-free fumigation rate, belong to the beijing encyclopaedia green technologies ltd. Beijing centre for green science and technology co. Ltd. Is a high-technology enterprise that focuses on research, development, marketing and engineering of environmental equipment and services. Work on the development of new, high-tech, industrial and environmentally friendly technologies that provide scientific, efficient and low-cost ways and means of addressing decentralized environmental pollution, based on the principle of in situ sound management. The company has a high-quality research and development and market promotion and service team. It has developed online monitoring products and cloud data platforms, including hydro-water quality online monitoring systems, environmental sewage online monitoring platforms, and environmentally sound gas emissions online monitoring platforms. It has developed integrated low-cost, efficient waste-water treatment technologies for decentralized pollution "in situ sound treatment", integrated catering wastewater treatment technologies, clean oil-free smoke purification technologies, new, low-cost and fast-food fire safety integrated technologies, environmentally friendly alternative materials technologies and environmentally sound plant condensants technologies. Among them, the clean-up of real oil-free smoke has resulted in products and has been demonstrated in more than 100 catering enterprises in various provinces and cities, including kyosin, long triangle, shandong, anhui, etc. (including the people's university cafeteria, atai buns, pears soup, youth restaurant, the aegean sea shopping park, several provincial and municipal offices canteens, factory canteens, etc.) and has been unanimously approved and recommended by users and industry authorities, including environmental and fire protection authorities. The indicators have been tested by a number of cma accredited testing institutions, including hebei province and beijing city。