Abstract: In recent years, haze weather has frequently appeared in people's lives. The haze not only brings inconvenience to the people who give it to them, but also brings harm to people's bodies. Not only that, haze also directly brings serious safety hazards to the safety of the power grid and the operation of electric power equipment, and under certain conditions, flashing accidents occur. This article explains the concept of helium flash, smog, and PM2.5. While expounding the hazards and sources of smog, it also discusses the mechanism of helium flash and measures to suppress helium flash. It is pointed out that the best way to prevent flashing is dry ice cleaning and cleaning technology.