KNJ Engineering Co., Ltd. was established in 1992 and has specialized in research and development in the atmospheric field. KNJ Engineering Co., Ltd. manufactures measurement equipment for general ambient air, indoor air quality, and sources of air pollution, as well as provides continuous air quality monitoring systems (Air Quality Monitoring System; We have accumulated specialized know-how in the air sector over decades, including AQMS installation, domestic and international supply, and maintenance management