CAL FIRE Practice Exam 2026 – Your All-in-One Guide to Excelling in California Forestry and Fire Protection Certification!

Smoke is primarily composed of a combination of vapor, gases, and particles produced during the combustion process.

Vapor consists of water vapor and other gaseous products released as fuel is burned, while gases can include carbon monoxide, carbon dioxide, and various organic compounds. Particles within smoke are made up of unburned carbon, ash, and other solid residues that result from incomplete combustion. These components contribute to the physical and chemical properties of smoke.

Heat, while it is a byproduct of combustion and is closely associated with smoke, is not a component of smoke itself. Instead, it refers to the thermal energy released during the burning process. Therefore, identifying heat as a component is incorrect since it does not have a physical presence in the smoke's structure.