AL Sewer Projects Practice Questions - Alabama Sewer Projects Contractor Examination Exam

Which atmospheric condition is generally considered oxygen-deficient and dangerous for entry without protection?

Oxygen at about 20.9% (normal air) Oxygen below 19.5% Oxygen at 21% with no other contaminants Any reading above 16% is always safe without testing for toxics

Correct Answer:

Oxygen below 19.5%

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