Guangzhou Rongyesheng Environmental Protection Products Co., Ltd., a wholly-owned subsidiary of Sweden Rongsheng Group in Chinese Mainland, is mainly engaged in the sales, system integration and technical support of online gas monitoring systems. It is the only agent and technical service center designated by Sweden's OPSIS brand instruments in China. It has branches or branches in Hong Kong, Guangzhou, Shanghai and Chongqing to serve users nationwide. In 1992, OPSIS instruments began to enter Hong Kong, China. In 1996, they were successfully applied at the environmental monitoring station in Shenzhen. Since then, they have been used in cities such as Xiamen, Fuzhou, Hangzhou, Lhasa, Haikou, Nanjing, Nanning, and Dalian. By 2006, they had been widely used and recognized in Zhejiang Province and in Chongqing in 2008. OPSIS has become increasingly popular and recognized in China. Today, with the continuous improvement of people's environmental awareness and the standardization and normalization of pollutant emissions and monitoring by the country, environmental monitoring, as an objective and fundamental work of environmental protection, has received due attention and made significant progress. We believe that OPSIS can collaborate with environmental protection departments and related enterprises to establish an automated and efficient air quality monitoring system and pollution source online monitoring system, and make a modest contribution to comprehensively improving China's pollution source exhaust gas monitoring and environmental air automation monitoring level, and perfecting the monitoring network.