A worker is exposed to noise levels of 95 dBA for 4 hours during concrete cutting operations. According to OSHA's permissible exposure limits, what is the maximum additional exposure time allowed at this noise level for the same 8-hour shift?
Correct Answer
A) 0 hours (limit exceeded)
OSHA allows a maximum of 4 hours exposure at 95 dBA per 8-hour shift. Since the worker has already been exposed for 4 hours at this level, no additional exposure at 95 dBA is permitted without exceeding the permissible exposure limit.
Why This Is the Correct Answer
OSHA's permissible exposure limits (PEL) for noise specify that workers can be exposed to 95 dBA for a maximum of 4 hours during an 8-hour shift. Since the worker has already been exposed to 95 dBA for the full 4-hour limit during concrete cutting operations, any additional exposure at this noise level would exceed OSHA's permissible limits. The worker must either move to a quieter environment or use additional hearing protection for the remainder of the shift.
Why the Other Options Are Wrong
Option C: 6 hours
Adding 2 more hours would result in 6 total hours of exposure at 95 dBA, which exceeds OSHA's 4-hour limit for this noise level. This would violate permissible exposure limits and put the worker at risk of hearing damage beyond acceptable safety standards.
Option D: 2 hours
Six additional hours would create 10 total hours of exposure at 95 dBA, which is 2.5 times the OSHA limit. This represents a severe violation of safety standards and would expose the worker to dangerous noise levels far beyond acceptable limits.
Memory Technique
Use '95-4' rule: 95 dBA = 4 hours max. When you see 95 dBA, immediately think 4-hour limit per shift.
Reference Hint
OSHA 29 CFR 1926.95 - Personal Protective Equipment, Table D-2 Permissible Noise Exposures
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