SHP Environmental Health & Industrial Hygiene

Question 1

What is OSHA's permissible exposure limit (PEL) for noise as an 8-hour time-weighted average (TWA)?

Accepted Answer

90 dB(A)

Answer

OSHA's PEL for occupational noise exposure is 90 dB(A) as an 8-hour TWA, with a 5 dB exchange rate.

Question 2

Which organization publishes Threshold Limit Values (TLVs) for chemical substances and physical agents in the workplace?

Accepted Answer

ACGIH (American Conference of Governmental Industrial Hygienists)

Answer

The ACGIH publishes TLVs annually as recommended guidelines for occupational exposure to chemical substances and physical agents.

Question 3

In the hierarchy of hazard controls, which method is considered the most effective for protecting workers?

Accepted Answer

Elimination

Answer

Elimination—completely removing the hazard—is the most effective control because it eradicates the risk rather than managing or reducing exposure to it.

Question 4

Indoor CO2 levels above what concentration are generally associated with inadequate ventilation and increased occupant complaints?

Accepted Answer

1,000 ppm

Answer

CO2 levels above 1,000 ppm typically indicate inadequate fresh air ventilation and are associated with occupant complaints such as headaches and reduced cognitive performance.

Question 5

Under OSHA's Hearing Conservation Amendment (29 CFR 1910.95), at what noise action level must employers implement a hearing conservation program?

Accepted Answer

85 dB(A) TWA

Answer

OSHA requires a hearing conservation program when employee noise exposures equal or exceed 85 dB(A) as an 8-hour TWA, triggering audiometric testing and hearing protection.

SHP - Safety and Health Professional Certified Practice Test

SHP - Safety and Health Professional Certified Practice Test

SHP Environmental Health & Industrial Hygiene