CIH CIH Industrial Hygiene Sampling & Monitoring 3

Question 1

What is 'action level' as defined by most OSHA substance-specific standards?

Accepted Answer

Half the PEL, triggering monitoring and medical surveillance requirements

Answer

OSHA defines the action level as one-half the PEL, at which point employers must initiate monitoring, medical surveillance, and training programs.

Question 2

Which sampling medium is used to collect acidic gases such as hydrogen chloride from workplace air?

Accepted Answer

Glass fiber filter with sodium carbonate

Answer

Acid-impregnated or alkaline-coated filters (such as glass fiber with sodium carbonate) chemically react with and capture acidic gas molecules.

Question 3

During a noise sampling campaign, a sound level meter set to 'slow response' and 'A-weighting' is used primarily to measure what?

Accepted Answer

Steady-state noise approximating human hearing sensitivity

Answer

A-weighting filters mimic the frequency sensitivity of human hearing, and slow response averages rapid fluctuations to represent steady occupational noise exposure.

Question 4

What is the minimum number of samples recommended by NIOSH to statistically characterize a similar exposure group (SEG)?

Accepted Answer

6

Answer

NIOSH recommends collecting at least 6 samples from a SEG to achieve reasonable statistical confidence in the exposure distribution.

Question 5

What does a passive (diffusive) dosimeter rely on for sample collection rather than a pump?

Accepted Answer

Molecular diffusion across a stagnant air layer

Answer

Passive dosimeters collect contaminants by Fickian diffusion through a stagnant air layer, eliminating the need for an air-moving pump.

CIH - Certified Industrial Hygienist Exam Practice Test

CIH - Certified Industrial Hygienist Exam Practice Test

CIH CIH Industrial Hygiene Sampling & Monitoring 3