CIH Cheat Sheet 2026

The 30 highest-yield CIH facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which sampling approach should be used when a worker performs multiple tasks with different exposure levels throughout the day? → Task-based sampling with time-weighted averaging
2. Which of the following is not a non-technical test to see if there are too many noises in the workplace? → Are employees volunteering to wear earplugs or muffs?
3. All of the following may be used as exposure control strategies in industrial hygiene, with the exception of: → rule enforcement
4. Inadequately designed tools, workstations, or work processes are some of these risks. → ergonomic hazards
5. In the hierarchy of controls, what is the correct position of personal protective equipment (PPE)? → Last resort after elimination, substitution, engineering, and administrative controls
6. What does the geometric standard deviation (GSD) indicate in occupational exposure data analysis? → The spread or variability of a lognormal exposure dataset
7. The skin's top layer is impermeable to this invisible low frequency radiation: → infrared
8. The ACGIH published this exposure guideline for airborne concentrations, known as the → Threshold Limit Value (TLV)
9. OSHA advises maintaining temperatures between ____ and ____ degrees Fahrenheit and maintaining humidity levels between ____ and . → 68-76 degrees; 20%-60%
10. A competent individual at an excavation site should be aware of, and be able to recognize and address hazards associated with, ALL OF THE FOLLOWING, EXCEPT: → biological hazards
11. Which two consequences can be arbitrarily separated from a substance's action? → acute and chronic
12. The signs of this illness include weakness, headaches, dizziness, weariness, and blurred vision. → heat exhaustion
13. Which of the following is the BEST example of an engineering control implemented to mitigate ergonomic risk factors for an assembly line worker? → Installing an articulating arm to hold a heavy power tool.
14. To Determine If A Chemical Is Hazardous, Consider Each Of The Following, EXCEPT For . → Selectivity
15. Every toxicological evaluation is based on the: → dose-response relationship
16. Which of the following exposure routes is the most typical? → Inhalation
17. What does the acronym IDLH stand for in the context of respiratory hazard evaluation? → Immediately Dangerous to Life or Health
18. Depending on their scope, inspections, whether planned or not, can be divided into one of two groups. What one of the following best sums up these two groups? → comprehensive and partial
19. According to OSHA's compliance sampling strategy, what constitutes an overexposure finding for an 8-hour TWA? → The measured TWA exceeds the PEL after accounting for sampling and analytical error
20. Which sampling media is most appropriate for collecting airborne hexavalent chromium [Cr(VI)] samples according to OSHA Method ID-215? → PVC membrane filter (5 µm)
21. What statistical distribution is most commonly assumed for occupational exposure data when performing lognormal analysis? → Lognormal distribution
22. Which of the following methods for reducing or eliminating workplace health risks is most effective? → Engineering controls
23. According to the hierarchy of controls, which of the following is considered the most effective method for controlling workplace hazards? → Elimination or Substitution
24. Between __ Hz, the body will respond to vertical vibration most strongly: → 4 and 8
25. State-level safety and health regulations may be implemented in accordance with OSHA guidelines, provided that: → state rules are at least as effective
26. What is the APF for a full-facepiece air-purifying respirator (FFAPR)? → 50
27. When a situation is not covered by a particular industry standard, the following OSHA standard category applies: → universal standards (horizontal)
28. These dangers result from elevated levels of mists, vapors, gases, or solids in the form of mists or dusts in the air: → chemical hazards
29. Organophosphate pesticides primarily exert their toxic effect through which mechanism of action? → Inhibiting the enzyme acetylcholinesterase
30. The following factors are all crucial ones to take into account when sampling air, with the exception of: → sequence of sampling