Substitution in hazard control refers to which of the following?

Substitution in hazard control refers to which of the following?

• A. Removing a hazard by isolation
• B. Replacing a hazardous material with a less hazardous one
• C. Diluting the atmosphere
• D. Providing protective equipment

Answer: (B)

Substitution in hazard control means replacing a hazardous material or process with a less hazardous one, aiming to reduce risk at the source. This approach is at the top of the hazard-control hierarchy because it removes or lowers the hazard before workers are exposed. For example, using a water-based paint instead of a solvent-based paint, or choosing a cleaning chemical with lower toxicity. By making this change, exposure is reduced without relying on protective gear or complex controls, which is more effective than diluting the air or depending on PPE. The other options either keep the hazard in place (isolation), reduce exposure through dilution (ventilation), or rely on protective equipment, which are less protective than substituting with something safer. If a suitable substitute isn’t available, other controls can be used, but substitution remains the preferred first step when feasible.

Substitution in hazard control means replacing a hazardous material or process with a less hazardous one, aiming to reduce risk at the source. This approach is at the top of the hazard-control hierarchy because it removes or lowers the hazard before workers are exposed. For example, using a water-based paint instead of a solvent-based paint, or choosing a cleaning chemical with lower toxicity. By making this change, exposure is reduced without relying on protective gear or complex controls, which is more effective than diluting the air or depending on PPE. The other options either keep the hazard in place (isolation), reduce exposure through dilution (ventilation), or rely on protective equipment, which are less protective than substituting with something safer. If a suitable substitute isn’t available, other controls can be used, but substitution remains the preferred first step when feasible.