Lead-based paint removal requires worker protection when the lead concentration exceeds what threshold?
Correct Answer
C) 50 μg/m³
OSHA's lead standard requires worker protection when airborne lead concentrations exceed 50 μg/m³ (micrograms per cubic meter). This is the permissible exposure limit for lead in construction work.
Why This Is the Correct Answer
OSHA's lead standard for construction (29 CFR 1926.62) establishes 50 μg/m³ as the permissible exposure limit (PEL) for airborne lead concentrations. When this threshold is exceeded, employers must implement specific worker protection measures including respiratory protection, protective clothing, and medical surveillance. This standard applies specifically to construction activities involving lead-based paint removal and renovation work. The 50 μg/m³ limit is based on an 8-hour time-weighted average exposure.
Why the Other Options Are Wrong
Option A: 10 μg/dL
10 μg/dL refers to blood lead levels (micrograms per deciliter), not airborne concentration limits. This is a medical measurement used to assess lead absorption in the body, not workplace air quality standards.
Option B: 30 μg/m³
30 μg/m³ is the action level under OSHA's lead standard, which triggers certain requirements like exposure monitoring and medical surveillance, but it is not the threshold that requires full worker protection measures.
Option D: 100 μg/m³
100 μg/m³ is too high and would represent a dangerous exposure level that exceeds OSHA's permissible exposure limit by double. This concentration would require immediate corrective action and enhanced protection measures.
Memory Technique
Think 'Fifty for Safety' - when airborne lead hits 50 μg/m³, full safety protection kicks in. Also remember the units: μg/m³ for air, μg/dL for blood.
Reference Hint
OSHA Construction Standards 29 CFR 1926.62 - Lead exposure in construction, or Florida Building Code Chapter 7 - Special Construction Requirements
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