The IDLH value for anhydrous ammonia as defined by ANSI/ASHRAE 34 is?

The IDLH value for anhydrous ammonia as defined by ANSI/ASHRAE 34 is?

• A. 320 ppm
• B. 300 ppm
• C. 350 ppm
• D. 400 ppm

Answer: (A)

Anhydrous ammonia presents rapid, potentially life-threatening respiratory hazards, so the IDLH value marks the concentration at which a person could escape only with significant risk of immediate health danger and without specialized rescue. ANSI/ASHRAE 34 specifies 320 ppm as the IDLH for ammonia, reflecting this acute hazard and the standard’s safety margins for emergency response and ventilation design. This value is the one used in the standard to guide precautions, alarms, and protective measures, and it differs from other exposure limits intended for ongoing work safety. Therefore, 320 ppm is the IDLH for ammonia per ANSI/ASHRAE 34.

Anhydrous ammonia presents rapid, potentially life-threatening respiratory hazards, so the IDLH value marks the concentration at which a person could escape only with significant risk of immediate health danger and without specialized rescue. ANSI/ASHRAE 34 specifies 320 ppm as the IDLH for ammonia, reflecting this acute hazard and the standard’s safety margins for emergency response and ventilation design. This value is the one used in the standard to guide precautions, alarms, and protective measures, and it differs from other exposure limits intended for ongoing work safety. Therefore, 320 ppm is the IDLH for ammonia per ANSI/ASHRAE 34.