CIH Study Guide 2026

Everything you need to pass the CIH exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.

📋 CIH Exam Format at a Glance

150

Questions

300 min

Time Limit

70%

Passing Score

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📚 CIH Topics to Study (69)

General · 16 cards Hazards & Exposures · 16 cards Certified Industrial Hygienist (CIH) MCQ · 16 cards General Practice · 16 cards Occupational Health Hazards · 16 cards OSHA · 16 cards Air Sampling and Instrumentation · 7 cards Air Sampling and Instrumentation · 7 cards Air Sampling and Instrumentation · 7 cards Air Sampling and Instrumentation · 7 cards Certified Industrial Hygienist (CIH) MCQ · 7 cards Certified Industrial Hygienist (CIH) MCQ · 7 cards Certified Industrial Hygienist (CIH) MCQ · 7 cards Certified Industrial Hygienist (CIH) MCQ · 7 cards Engineering Controls and Ventilation · 7 cards Engineering Controls and Ventilation · 7 cards Engineering Controls and Ventilation · 7 cards Engineering Controls and Ventilation · 7 cards Ergonomics and Biomechanics · 7 cards Ergonomics and Biomechanics · 7 cards Ergonomics and Biomechanics · 7 cards Ergonomics and Biomechanics · 7 cards General · 7 cards General · 7 cards General · 7 cards General · 7 cards General Practice · 7 cards General Practice · 7 cards General Practice · 7 cards General Practice · 7 cards

See all 69 topics as flashcards →

✍️ Sample CIH Questions & Answers

1. An IH manager notices that corrective actions from previous audits are frequently not implemented on schedule. The most appropriate management response is to:

✓ Establish a formal corrective action tracking system with assigned owners and due dates reviewed by management

A formal tracking system with ownership and management oversight creates accountability and ensures corrective actions are completed systematically.

2. Which control measure hierarchy level does administrative rotation of workers through high-noise areas represent?

✓ Administrative controls

Rotating workers to limit their time in high-noise areas is an administrative control, the third tier in the hierarchy of controls.

3. Which type of non-ionizing radiation is most associated with occupational skin and eye damage from welding operations?

✓ Ultraviolet radiation

Ultraviolet radiation from welding arcs causes photokeratitis (arc eye) and skin burns, making it the primary non-ionizing radiation hazard in welding.

4. What is the best estimate of combined noise attenuation when an employee wears both earplugs and earmuffs simultaneously?

✓ Add 5 dB to the higher NRR value

When dual hearing protection is used, OSHA and NIOSH recommend adding approximately 5 dB to the higher NRR because bone conduction limits the combined attenuation achievable.

5. A hierarchy of controls lists elimination, substitution, engineering controls, administrative controls, and PPE. Which is considered MOST effective?

✓ Elimination

Elimination physically removes the hazard at the source and is the most protective control measure.

6. Under OSHA's machine guarding standard (29 CFR 1910.212), which type of guard is attached directly to the machine and provides a barrier that prevents access to the danger zone?

✓ Fixed guard

A fixed guard is a permanent barrier fastened to the machine that requires tools to remove, providing constant protection.

🎯 Free CIH Practice Tests

General · 16 questions General Practice · 16 questions Hazards & Exposures · 16 questions Certified Industrial Hygienist (CIH) MCQ · 16 questions Occupational Health Hazards · 16 questions OSHA · 16 questions Personal Protective Equipment (PPE) · 7 questions Personal Protective Equipment (PPE) · 7 questions Personal Protective Equipment (PPE) · 7 questions General · 7 questions

📖 CIH Guides & Articles

Your CIH Study Path

1. Learn with Flashcards → 2. Drill Practice Tests → 3. Take the Full Exam Simulation

🃏 CIH Flashcards (525)🏆 CIH Exam Simulation

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