The product is used to monitor toxic and harmful gases in the atmosphere, including the emission of polluted gases from conventional factories, or emergency scenes such as fire scenes (such as Tianjin Port incident, Xiangshui incident). General emergencies will bring about secondary pollution accidents. At the moment of such accidents, it is necessary to judge whether the air is polluted/toxic and harmful, and remote qualitative and quantitative analysis is required, which has helped the development of rescue accidents and the post-accident treatment work to provide.