Which THREE factors can affect the selection and use of an air-purifying respirator (APR) at a HazMat incident?

The selection and use of an air-purifying respirator (APR) at a HazMat incident is influenced by multiple factors, and one of the key considerations is the expiry date of filtration devices. The filtration devices in an APR are designed to capture specific types of airborne contaminants. Over time, these filters can degrade or become saturated, diminishing their effectiveness. If a filter reaches its expiry date, it may no longer be capable of providing adequate protection against hazardous vapors, which could lead to inhalation of harmful substances. Thus, ensuring that the filters are within their usable lifespan is crucial for maintaining the safety and efficacy of the respirator.

The other factors, such as personnel training and experience, concentration of hazardous vapors, and the type of protective clothing worn, also play significant roles in the overall safety and effectiveness of respiratory protection in hazardous environments, but they are not directly related to the functional integrity of the APR itself.