One of the major hazards associated with firefighting operations is the toxic environment created by combustible materials. The four major risks are smoke, oxygen deficiency, an elevated temperature, and poisonous atmospheres. Additional hazards include falls and structural collapse that can exacerbate the problems encountered in a toxic environment. To combat some of these risks, firefighters carry self-contained breathing apparatus.

The first step in a firefighting operation is reconnaissance to search for the origin of the fire and to identify the specific risks.

Fires can be extinguished by water, fuel or oxidant removal, or chemical flame inhibition; though, because fires are depending on the elements involved, such as grease, paper, electrical, etcetera, a specific type of fire extinguisher may be required. The classification is based on the type of fires that the extinguisher is more suitable for. In the United States, the types of fire are described by the National Fire Protection Association.

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