What is the scope of NIOSH's respirator selection logic?

• A. Dust, gases, particles
• B. Oxygen deficiency, temperature, humidity
• C. Biological hazards and particulates
• D. Vapor and aerosol concentrations

Answer: (A)

NIOSH’s respirator selection logic focuses on the types of airborne hazards you need protection from. It guides choosing respirators based on whether the hazard is a particulate (dust and other aerosols) or a gas/vapor. The option that lists dust, gases, and particles directly reflects these primary hazard categories the logic covers. The other choices bring in environmental factors (like oxygen levels, temperature, humidity) or narrow scopes (only biology, or only concentrations), which aren’t the fundamental scope of the respirator selection framework.