The CIH (Certified Industrial Hygienist) is an internationally recognized certification granted by the American Board of Industrial Hygiene (ABIH).  It is the only certification process for scientists in industrial hygiene with the following qualifications:

• A bachelors or advanced college degree in the sciences or engineering.
• A minimum of 5 years of full time professional experience.
• Adherence to a strict code of ethics.
• Required continuing practice and on-going professional education.
• Successful completion of two full days of written (closed book) examinations.  The exams contain questions on the following subjects:  Biohazards; biostatistics and epidemiology; engineering controls; non-engineering controls; ergonomics; ethics and management; analytical chemistry; sampling, monitoring and instrumentation; noise and vibration; ionizing radiation; nonionizing radiation; regulations, standards, and guidelines; thermal and pressure stressors; toxicology; and general IH topics including community exposures, hazardous wastes, risk communication, indoor environmental quality, and others (unit operations, process safety, and confined spaces).