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CIH Exam 2025/2026 – Certified Industrial Hygienist Study Guide & Practice Questions

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Prepare for the CIH Exam with the latest 2025/2026 study guide. Access verified practice questions, accurate answers, and A+ grade solutions to succeed in the Certified Industrial Hygienist certification.

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CIH Exam CIH exam
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1. Bussinosis An acute chest tightness that refutes at the beginning of each work week and last
1 to 2 days in early stages. Eventually becomes a chronic, disabling disease
From exposure to a finely pulverized bract of the cotton plant. Cotton textile
workers

2. Raynaud's Syn- White fingers due to vibration
drome Woman are more susceptible

3. High Octave Upper edge frequency is the square root of 2 times the lower frequency band
band

4. Nitrogen Con- 78%
centration in the
outside air

5. Area of a circle A=πr² or A=D^2/4
formula

6. Oxygen Deficient Less than 19.5%
Atmosphere

7. Oxygen Concen- 20.9%
tration @ sea lev-
el

8. Adsorption Gases/liquids collect on a solid

9. Absorption Gases/liquids collect on a solid or liquid and accompanied by a chemical reaction
More permanent

10. Gravimetric set- Uses gravity, chip traps. Oldest method. Low flow and uniform. Low efficiency
ting chambers

11. Air enters top and spirals down, then reverses direction and traces up to the outlet
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Cyclone collec-
tors

12. Bag house filters Tubular fabric filters in a housing. Inexpensive, not as efficient. Requires cleaning
plugging can be a problem and not as efficient when clean/new.

13. Dynamic precipi- A combo fan and dust collection devise. No pressure loss. Gas flow deceases with
tator blade wear. Efficiency is approximately 70%

14. Filtration Flow through a porous membrane

15. wet collector Uses a liquid (typically water) to desperate particulates from aerosols

16. Sampling media Most common
- activated char- Used for organic
coal High absorptive capacity
Not recommended for for highly reactive compounds

17. Sample media - Used for polar compounds
silica gel Less reactive than charcoal
Recommended for amines, methanol, creosols, PNAs, acids

18. Incident rate (IR) Number of new cases of a disease per worker population per time period

19. Prevalence rate Number of existing cases of a disease in a worker population at a specific time

20. Relative Risk (RR) Prevalence rate of a disease in the exposed worker population decided by the
prevalence rate of disease in the unexposed worker population

21. Attributed Risk Prevalence of disease in the exposed worker population minus the prevalence rate
in the unexposed

22. Case Report To present clinical information on a case

23.
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Case-control Identify a group of workers with disease and examine their work history for
study potential exposures

24. cohort Identify a group of workers by exposure and follow them over time for develop-
ment of diseases
These studies have the most power

25. cross-sectional Select a group of workers irrespective of exposure or disease and measure over
study time

26. Mortality Studies Comparing mortality rate of work were population to a control population

27. selection bias Different criteria used for cases and controls

28. Observation Bias Information on disease outcome obtained n no comparable manner between
exposed and no exposed groups

29. Confounding Failure to take into account other variables (ie smoking) which are associated with
Bias both disease and the exposure

30. PIDs Expose the air to UV light. Chemicals with ionizing potential below the energy of
the UV light will be ionized and generate an electrical single that is proportional
to the amount of chemical present.

31. # of samples 6 or more
for a statistically NIOSH also has a chart to reference for sample #s based on employee #s
valid mean and
confidence inter-
val (according to
NIOSH)

32. Paper/Pulp Man- Chemical method or sulfate digestion; wood chops broken down with sodium
ufacture sulfate and heat; resulting pulp is bleached washed and bleached (chorine);
Kraft Method washes pulp is rolled, dried and cut
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33. Petroleum Re- Benzene and hydrogen sulfide
fineries Expo-
sures

34. Thermoplastics Soften repeatedly with heat
Exposures: high & low density polyethylene, polypropylene, polyvinylchoride,
polystyrene

35. Brucellosis Bacteria transmitted to humans when handling infected meats

36. Arc Welding An arc (4000oC$ is struck between an electrode and work pieces
PPE: goggles, face shields and clothing
Most common dangers are UV and IR
Can create fumes

37. Class A head pro- Impact and limited voltages
tection

38. Class B head pro- Impact and high voltages
tection

39. Class C head pro- Impact protection but no voltage protection
tection

40. Level A PPE DCBA or positive pressure airline system with escape SCBA and totally encapsu-
lating chemical protective suit, gloves and boots

41. Level B PPE SCBA or positive pressure Suite and hooded chemical resistant suit, gloves and
boots

42. Level C PPE Full or half face respirator, hooded chemical resistant suit, gloves and boots

43. Level D PPE No respiratory protection, outer garments with optional gloves, boot coverings
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