Commodity Fumigation License Practice Exam

When applying phosphine-producing fumigants, at what level of concentration are SCBA or supplied air-line respirators needed?

1. At 0.5 ppm

2. At 0.3 ppm

3. At 1 ppm

4. At all times during application

The correct answer is: At 0.3 ppm

When applying phosphine-producing fumigants, the requirement for self-contained breathing apparatus (SCBA) or supplied air-line respirators is determined by the permissible exposure limits established for phosphine. Under regulations, effective respiratory protection is mandated when phosphine levels exceed certain thresholds to ensure worker safety and health. The specified threshold at which respiratory protection becomes necessary is at 0.3 ppm. At this concentration, the potential for adverse health effects increases, necessitating more stringent safety measures. It is crucial to wear SCBA or supplied air-line respirators to mitigate the risks of inhalation exposure to phosphine vapors, ensuring that workers are protected from the toxic effects associated with higher levels of exposure. By adhering to this guideline, fumigators can effectively manage their exposure to harmful chemicals, paving the way for safer working conditions during the fumigation process.