In which situation is it required to use air-purifying respirators?

The use of air-purifying respirators is specifically required in emergency situations involving fumigants because these respirators are designed to filter out harmful substances from the air that may occur during a fumigation incident. In emergencies, the concentration of hazardous gases can increase sharply, presenting an immediate risk to health. Air-purifying respirators help protect the wearer by providing a means to breathe clean air, essential for staying safe in such environments.

Other situations, such as regular everyday use or training, do not present the same level of risk that would necessitate the same type of respiratory protection. In regular use, while some level of air contaminants may be present, they are typically not at dangerous levels that would require special respiratory protection. Additionally, while alternative protective equipment might be available during non-emergency situations, relying solely on an air-purifying respirator in those contexts may not be appropriate or necessary.