1. Grain and Agricultural Product Processing and Storage
Sites: Grain silos, grain elevators, flour mills, sugar mills, cocoa processing plants, coffee processing plants, and feed mills.

Risks: Large amounts of combustible dust, such as flour, starch, powdered sugar, and milk powder, are generated during processing, transportation, and storage. When these fine dusts reach a certain concentration in the air and encounter an ignition source, they can cause a violent dust explosion.

2. Metal Processing and Manufacturing
Sites: Polishing, grinding, and processing workshops for metals such as aluminum, magnesium, titanium, and zirconium; and 3D printing (metal powder) workshops.

Risks: Some metals are highly flammable in powder form, especially aluminum and magnesium powders. Once they form clouds in the air, they can easily ignite and cause a violent explosion.

3. Textile and Wood Processing
Sites: Textile mills (especially those processing fibers such as cotton and linen), man-made fiber mills, wood processing plants, sawmills, and furniture manufacturing workshops.

Risks: Natural fiber dust, man-made fiber dust, and wood dust are all combustible. Accumulating to a certain concentration in a confined space can cause explosions when exposed to a fire source.

4. Municipal and Public Utilities

Sites:

Wastewater treatment plants/biogas plants: The treatment process produces flammable and explosive gases such as methane (biogas) and hydrogen sulfide.

Gas pressure regulating stations/boiler rooms: There is a risk of leakage of fuels such as natural gas and liquefied petroleum gas.

City gas pipeline wells and underground utility corridors: Leaked gas may accumulate.

Landfills/incineration plants: The decomposition of waste produces methane.