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CIHs Provide Employers Experience and a Diverse Field of Knowledge

The American Board of Industrial Hygiene (ABIH) administers the internationally recognized Certified Industrial Hygienist (CIH) program.


Professionals who have earned the Certified Industrial Hygienist certification are the premier practitioners of the industrial hygiene profession.  The credential requires the industry’s most demanding measure of education, experience and examination. Consequently, the credential is held by only a select group of individuals worldwide.
Just to apply to take the CIH examination, an applicant must meet academic requirements, show professional industrial hygiene experience, and be in the current practice of industrial hygiene.  Academic requirements include graduation from an accredited college or university with at least a Bachelor’s degree from specific programs along with 180 academic contact hours or 240 continuing education contact hours of industrial hygiene courses.  Depending upon the person’s degree, three to four years of employment in the professional practice of industrial hygiene are also required to be eligible for the examination.  In addition, a minimum of two professional references must be provided, including the applicant’s immediate supervisor.  Another reference must be from a CIH who is familiar with the applicant’s industrial hygiene work and can describe, from firsthand experience, the nature of the applicant’s industrial hygiene responsibilities.
Once accepted to take the examination, the applicant must show they understand numerous core competencies.  They include:

  • Air Sampling and Instrumentational Analysis
  • Basic Science
  • Biohazards
  • Biostatistics and Epidemiology
  • Chemical Hazards
  • Community Exposure
  • Engineering Controls/Ventilation
  • Ergonomics
  • Health Risk Analysis and Hazard Communication
  • Ionizing Radiation
  • Management
  • Noise and Hearing Loss Prevention
  • Non-Engineering Controls
  • Nonionizing Radiation
  • Thermal Stressors
  • Toxicology
  • Work Environments and Industrial Processes

“The ABIH has set a high, but very achievable hurdle to become a CIH,” reported Roger Smith, CIH, Certification Application Manager at the American Board of Industrial Hygiene.  “Industrial Hygienists who meet our education, experience and examination requirements join an elite group of professionals who have earned the right to put CIH after their name.  It is because of the diverse fields of knowledge and expertise necessary to become certified that so many private businesses and government institutions value and look to the CIH community to fill important positions.”  
To learn more about the American Board of Industrial Hygiene or the CIH program, please email , visit, or call (517) 321-2638.
About the American Board of Industrial Hygiene
Since 1960, ABIH, a not-for-profit corporation, has been the world’s largest, premier organization for certifying professionals in the practice of industrial hygiene. ABIH is responsible for ensuring high-quality certification including education, experience, examination, certification maintenance and ethics enforcement.


 Industrial Hygiene

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