Certified Safety Professional Exam Industrial Hygiene and Exposure Assessment 1

Question 1

What is the OSHA Permissible Exposure Limit (PEL) for silica dust (respirable crystalline silica)?

Accepted Answer

0.05 mg/m³ as an 8-hour TWA

Answer

OSHA's PEL for respirable crystalline silica is 0.05 mg/m³ as an 8-hour time-weighted average (TWA).

Question 2

Which sampling method is used to determine a worker's full-shift exposure to airborne contaminants?

Accepted Answer

Personal (full-shift) sampling

Answer

Personal full-shift sampling is worn by the worker throughout the shift to accurately represent actual breathing zone exposure.

Question 3

The ACGIH Threshold Limit Value – Short-Term Exposure Limit (TLV-STEL) represents a concentration that workers can be exposed to for how long?

Accepted Answer

15 minutes

Answer

The TLV-STEL is defined as a 15-minute TWA exposure that should not be exceeded during any part of the workday.

Question 4

What does a hazard ratio (HR) greater than 1.0 indicate in exposure assessment?

Accepted Answer

Exposure exceeds the occupational exposure limit

Answer

A hazard ratio greater than 1.0 means the measured exposure exceeds the established occupational exposure limit, requiring corrective action.

Question 5

Which type of industrial hygiene control is considered most effective in the hierarchy of controls?

Accepted Answer

Engineering controls – elimination or substitution

Answer

Elimination or substitution (engineering controls at the top of the hierarchy) is the most effective way to remove or reduce hazards at the source.

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