100+ Free CAIH Practice Questions

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2026 Statistics

Key Facts: CAIH Exam

180 Qs

Exam Questions

150 scored + 30 pilot

70%

Passing Score

126 correct answers

5 hrs

Time Limit

Two 2.5-hour sessions

35 pts

CM Points per Cycle

5-year recertification

The CAIH exam had 180 multiple-choice questions (150 scored, 30 pilot) with a 5-hour time limit and a 70% passing score. The exam was offered 2001-2006; the credential is still maintained through BGC recertification. Key content areas include air sampling and instrumentation, toxicology, chemical hazards, ventilation and engineering controls, noise assessment, and personal protective equipment. CAIH holders must earn 35 CM points every 5 years to maintain certification.

About the CAIH Exam

The CAIH credential was established by the Board for Global EHS Credentialing (formerly ABIH) for industrial hygiene professionals working in narrow-scope or multi-disciplinary roles. The exam focused on hazard recognition and evaluation rather than comprehensive program management, covering air sampling, toxicology, chemical and physical hazards, ventilation, noise, radiation, and PPE selection.

Questions

180 scored questions

Time Limit

5 hours

Passing Score

70% (126 of 180)

Exam Fee

$350 + $160 application fee (BGC (Pearson VUE))

CAIH Exam Content Outline

15%

Air Sampling & Instrumentation

Sampling strategies, direct-reading instruments, calibration, passive and active sampling, and quality assurance.

12%

Toxicology

Dose-response, routes of exposure, acute and chronic effects, target organ toxicity, and occupational exposure limits.

12%

Chemical Hazards

Recognition and evaluation of gases, vapors, dusts, fumes, mists, and organic solvents in workplace environments.

12%

Ventilation & Engineering Controls

Local exhaust ventilation, dilution ventilation, hood design, duct calculations, and capture velocity.

10%

Noise & Vibration

Sound measurement, noise dosimetry, audiometric testing, hearing conservation, and vibration assessment.

10%

Non-Engineering Controls & PPE

Respiratory protection, PPE selection criteria, administrative controls, and hierarchy of controls.

Radiation

Ionizing and non-ionizing radiation hazards, measurement, exposure limits, and shielding strategies.

Biological Hazards

Mold, bacteria, viruses, bloodborne pathogens, and biological sampling methods.

Thermal Stressors

Heat stress (WBGT), cold stress, acclimatization protocols, and physiological monitoring.

Ergonomics

Musculoskeletal risk assessment, workplace design, lifting guidelines, and ergonomic tools.

Analytical Chemistry

Sampling media selection, laboratory analysis, detection limits, chain of custody, and QA/QC.

How to Pass the CAIH Exam

What You Need to Know

Passing score: 70% (126 of 180)
Exam length: 180 questions
Time limit: 5 hours
Exam fee: $350 + $160 application fee

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

CAIH Study Tips from Top Performers

1Focus on air sampling techniques — know the difference between active and passive sampling, direct-reading instruments, and integrated sampling methods.

2Master OSHA PELs, NIOSH RELs, and ACGIH TLVs — understand how to compare sampling results to these occupational exposure limits.

3Study the hierarchy of controls in order: elimination, substitution, engineering controls, administrative controls, and PPE.

4Practice ventilation calculations including capture velocity, duct velocity, hood static pressure, and transport velocity for particulates.

5Review toxicology fundamentals: dose-response curves, LD50/LC50, routes of entry (inhalation, dermal, ingestion), and target organ effects.

Frequently Asked Questions

Is the CAIH exam still available?

The CAIH exam was discontinued in 2006 due to low demand. However, the CAIH designation is still recognized and supported by the Board for Global EHS Credentialing (BGC) through its certification maintenance program. Existing CAIH holders can maintain their credential by earning 35 CM points every 5 years and paying annual fees.

What is the difference between CAIH and CIH?

The CAIH was designed for specialists and multi-disciplinary professionals working in narrow-scope industrial hygiene roles, while the CIH is for broad-scope practitioners. The CAIH focused on hazard recognition and evaluation with less formal science prerequisites, whereas the CIH covers comprehensive practice including program management and requires 60 STEM semester hours.

How do I maintain my CAIH certification?

CAIH holders must earn 35 CM (Certification Maintenance) points during each 5-year cycle, including at least 10 points in industrial hygiene education and 0.33 points (2 hours) in ethics. Points are earned at a rate of 0.167 per hour of professional development. An annual fee of $150 is required, and 5% of diplomates are audited each cycle.

Can CAIH holders upgrade to CIH?

Yes. CAIH holders can apply for the CIH comprehensive exam if their current work experience qualifies for broad-scope industrial hygiene practice. They must meet CIH requirements including 48 months of professional-level experience in at least two occupational health stressor categories and the required academic coursework.