Hazmat Specialist Practice Questions - Hazardous Materials Specialist (NFPA 470) Certification Exam

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On a combustible gas indicator (CGI), a common action level that triggers evacuation or withdrawal in many response protocols is a reading of:

10% of the lower explosive limit (LEL) 100% of the upper explosive limit (UEL) 50% of the IDLH 23.5% oxygen

Correct Answer:

10% of the lower explosive limit (LEL)

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