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200+ Free OHST Practice Questions

Pass your Occupational Hygiene and Safety Technician (OHST) exam on the first try — instant access, no signup required.

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Questions by Category

Ohst-Hazard-Identification64 questions
Ohst-Health-Hazards-Ih54 questions
Ohst-Communication-Training33 questions
Ohst-Safety-Programs-Risk17 questions
Ohst-Emergency-Preparedness16 questions
Ohst-Ethics-Professional11 questions
Ohst-Math-Science-Business5 questions
2026 Statistics

Key Facts: OHST Exam

200

Total Questions

175 scored + 25 unscored

~66%

Passing Score

109 of 175 scored

4 hrs

Exam Duration

BCSP

$440

Total Fee

$140 app + $300 exam

31.4%

Hazard ID Domain

Largest domain

5 years

Recertification Cycle

20 points required

The OHST exam has 200 questions (175 scored + 25 unscored) in 4 hours. Seven domains: Hazard Identification & Control (31.4%), Safety/Health/Environmental Programs (18.3%), Industrial Hygiene (14.3%), Communication & Training (13.7%), Math/Science/Business (9.7%), Emergency Preparedness (7.4%), and Ethics (5.2%). Requires 3 years occupational safety experience. $440 total fee.

About the OHST Exam

The OHST (Occupational Hygiene and Safety Technician) exam validates competency in hazard identification and control, safety management programs, industrial hygiene, organizational communication, emergency preparedness, and professional ethics. It covers 7 domains with 200 questions (175 scored + 25 unscored).

Questions

200 scored questions

Time Limit

4 hours

Passing Score

~66% (109 of 175 scored)

Exam Fee

$440 ($140 app + $300 exam) (Board of Certified Safety Professionals (BCSP) / Pearson VUE)

OHST Exam Content Outline

31.4%

Hazard Identification and Control

Identify workplace hazards, risk assessment, incident investigation, and hazard control methods

18.3%

Safety, Health, and Environmental Programs

Safety management systems, risk management, regulatory compliance, program implementation

14.3%

Health Hazards and Basic Industrial Hygiene

Chemical, biological, and physical hazards, exposure assessment, sampling methods

13.7%

Organizational Communication and Training

Safety training development, communication techniques, documentation practices

9.7%

Fundamental Math, Science, and Business

Math and science applications in safety, statistics, business calculations

7.4%

Emergency Preparedness, Fire Prevention, Security

Emergency response planning, fire prevention systems, workplace security

5.2%

Ethics and Professional Conduct

BCSP Code of Ethics, professional responsibility, ethical decision-making

How to Pass the OHST Exam

What You Need to Know

  • Passing score: ~66% (109 of 175 scored)
  • Exam length: 200 questions
  • Time limit: 4 hours
  • Exam fee: $440 ($140 app + $300 exam)

Keys to Passing

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

OHST Study Tips from Top Performers

1Focus on Hazard Identification and Control (31.4%) — the largest domain covering workplace hazards, risk assessment, and incident investigation
2Master the hierarchy of controls: elimination, substitution, engineering controls, administrative controls, PPE
3Study OSHA standards: general duty clause, recordkeeping (300/300A/301), and common cited standards
4Know industrial hygiene fundamentals: PELs, TLVs, RELs, sampling methods, and exposure assessment
5Review emergency action plans, fire prevention plans, and evacuation procedures
6Understand the BCSP Code of Ethics — this domain (5.2%) appears on every exam and is tested directly

Frequently Asked Questions

What is the OHST certification?

OHST (Occupational Hygiene and Safety Technician) is a BCSP certification for safety professionals with at least 3 years of occupational health and safety experience. It validates competency across 7 domains including hazard identification, safety programs, and industrial hygiene.

How many questions are on the OHST exam?

The OHST exam has 200 questions (175 scored + 25 unscored beta questions) in 4 hours. The passing score is approximately 66% (109 of 175 scored questions). The exam is administered at Pearson VUE test centers.

What are the prerequisites for the OHST exam?

You need 3 years of experience in occupational hygiene or safety with a minimum of 35% of job tasks related to safety. A BCSP-qualified credential (OSHA 10/30, first aid/CPR, etc.) may be needed depending on the application pathway.

How does OHST compare to ASP and CSP?

OHST is designed for technician-level safety professionals with hands-on field experience. ASP (Associate Safety Professional) and CSP (Certified Safety Professional) require more education and broader safety management experience. OHST is often a stepping stone toward ASP/CSP.

How should I prepare for the OHST exam?

Plan for 80-120 hours of study over 6-10 weeks. Focus heavily on Hazard Identification and Control (31.4%) — the single largest domain. Also prioritize Safety Programs (18.3%) and Industrial Hygiene (14.3%). Complete practice exams to build timing skills for the 4-hour test.