Which combination of extinguishing agents is listed as among the most common used in Canada?

• A. Foam, AFFF, Water
• B. Dry Chemical, Water, CO2
• C. Foam, Dry Chemical, Water
• D. Dry Chemical, Water, Halons

Answer: (C)

The main idea is that airport firefighting in Canada relies on a trio of extinguishing agents that cover the most common fire scenarios: cooling with water, suppressing hydrocarbon fuels with foam, and providing rapid knockdown with dry chemical powders. Water is essential for cooling and extinguishing solid material fires; foam creates a barrier on liquid fuel fires and helps smother vapors; dry chemical powders are versatile and effective on electrical fires and mixed-class fires, offering quick, widespread extinguishment.

Halons are largely phased out due to environmental concerns, and CO2, while useful in some confined spaces, poses significant safety risks to nearby people and is not as broadly applicable for wide-area ARFF operations. Foam, dry chemical, and water together therefore represent the most common, practical combination used in Canadian airports.

The other options either omit foam, rely on agents less suitable for the typical airport fire scenarios, or include halons, which aren’t as common today.