What determines the type of respiratory protection required for a specific tank?

• A. The tank size
• B. The specific hazard
• C. The tank's color
• D. The weather conditions

Answer: (B)

Respiratory protection depends on the hazard present in the tank environment—the contaminant, its concentration, and whether the atmosphere has enough oxygen. The size or color of the tank doesn’t decide what type of respirator is needed, and weather conditions don’t determine the protection requirement by themselves. A hazard assessment and gas monitoring reveal if the atmosphere is oxygen-deficient, flammable, or contains toxic vapors, and that information guides the selection of the appropriate respirator and cartridge or a supplied-air system. If unknown or highly toxic conditions are possible, an SCBA or other backup protection may be required. In practice, you match the respirator to the specific contaminant and its concentration to keep exposure within safe limits.