Industrial Hygiene and Occupational Health

Industrial hygiene programs, chemistry, physiology, physical, chemical and biological hazards, exposure limits, routes of entry, pathogens, radiation, fitness for duty and Total Worker Health.

5 minutes 5 Questions

In the Associate Safety Professional (ASP) framework, Industrial Hygiene and Occupational Health form a core domain focused on recognizing, evaluating, and controlling workplace hazards that affect worker health. Industrial hygiene is the science and art devoted to anticipating, recognizing, evalua…

Concepts covered
Biological Hazards and MoldChemical Hazard Classes and Target OrgansIonizing and Non-Ionizing Radiation HazardsHearing Conservation ProgramsIonizing Radiation PrinciplesOccupational Exposure LimitsNoise and Vibration HazardsGeneral Chemistry for SafetyAcute versus Chronic ExposureRoutes of EntryRespirable Dust and NanoparticlesIdeal Gas Law, Neutralization and pHTotal Worker HealthFitness for Duty and Return to WorkMedical SurveillanceRespiratory Protection ProgramsHeat and Cold StressCarcinogens, Mutagens and TeratogensAnatomy and Physiology of ExposureUniversal Precautions and Bloodborne Pathogens
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ASP - Industrial Hygiene and Occupational Health Example Questions

Test your knowledge of Industrial Hygiene and Occupational Health

Question 1

Which statement best describes the primary purpose of a fitness-for-duty evaluation in an occupational health program?

Correct Answer: Decide if the worker can safely perform essential job tasks

A fitness-for-duty evaluation determines whether a worker can safely perform the essential functions of the job, with or without restrictions or accommodations, without undue risk to themselves or others.
Deciding work-relatedness and compensability is a workers' compensation causation determination, not a fitness assessment. Establishing a baseline exposure record describes pre-placement or medical surveillance exams tied to specific hazards such as noise or lead. Giving the employer the full diagnosis and treatment plan violates medical confidentiality, because employers typically receive only functional capabilities and work restrictions.
Key concept: fitness-for-duty evaluations match a worker's functional capacity to essential job demands while protecting confidential medical information.

Question 2

Why do industrial hygienists treat particle surface area, and not mass concentration alone, as an important dose metric for nanoscale particles?

Correct Answer: Equal masses of finer particles offer far more reactive surface area

For the same mass, smaller particles have far more total surface area, because surface area per unit mass rises as diameter shrinks. Toxicity studies show that inflammation and oxidative stress track this reactive surface better than mass, so mass concentration alone can underestimate nanoparticle hazard.
The settling claim is backwards: nanoparticles settle very slowly and deposit mainly in the alveolar region by diffusion. Gravimetric samplers do not overstate nanoparticle mass. They tend to miss it, because nanoparticles weigh so little. Solubility depends on chemistry and is not the main reason surface area matters.
Key concept: surface area, specific surface area and particle number as dose metrics for nanoparticle toxicity.

Question 3

Asbestos abatement workers wear vapor-impermeable coveralls with hoods while doing moderate work inside a closed building in summer. Negative-pressure enclosure rules limit how much the space can be cooled, and a work-rest schedule is already in place. Supervisors still see high heart rates and fatigue among the workers. Which additional control BEST addresses the main reason the coveralls are raising the workers' heat strain?

Correct Answer: Supply cooling vests worn beneath the suits

Vapor-impermeable coveralls block sweat evaporation, the body's main way to lose heat during work. Cooling vests worn under the suit pull heat directly from the torso inside that trapped microclimate, so they work even though the enclosure cannot be cooled.
Portable fans only move air across the outside of the suit. They cannot speed evaporation that the impermeable fabric prevents. Light-colored suits reflect radiant heat, but there is little solar load indoors, and color does not fix the vapor barrier. More water stations help replace fluids, which supports hydration, but they do not remove the heat the suit traps.
Key concept: impermeable protective clothing prevents evaporative cooling, so it requires microclimate (personal) cooling.

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