The fire of sulfur emitted from the volcano.
The extinguishment of the sulfur fire is also very messy and lengthy. We cannot spray a stream of water into the fire like regular fires because SO2 when combined with water will form H2SO3 acid, an acid related to acid rain that kills plants and fish. If the sulfur is being contained in a large vessel, the entire fire will turn into a big explosion.
The firefighting force is fully equipped with protective equipment, spraying a small amount of water and fire foam into the fire for 20 minutes to reduce the sulfur temperature to below the melting point, creating a surface coating to extinguish the fire. Sulfur fires rarely occur but are extremely dangerous, if you see this fire, call the fire department immediately to be handled promptly and carefully.