The certification credential is the highest available technical competency credential for an occupational/industrial hygiene (OH/IH) professional. It is internationally recognised as a measure of excellence and signifies a certain level of competence and specialized knowledge and skills. The credential holder has been assessed and verified on their level of education, years of experience, and by examination. The importance of a certification credential in OH/IH impacts the globe as it elevates the profession to ensure the global workforce is protected from workplace harm.
The following link will take you to the various certification programs offered by the National Associations :
| National Accreditation Scheme | Organisation Abbreviation | Title of the Certificant |
| Australian Institute of Occupational Hygienists | AIOH | Certified Occupational Hygienist (COH) |
| Board for Global EHS Credentialing | BGC | Certified Industrial Hygienist (CIH) |
| British Occupational Hygiene Society | BOHS | Diploma of Professional Competence in Occupational Hygiene (DipOH) |
| Canadian Registration Board of Occupational Hygienists | CRBOH | Registered Occupational Hygienist (ROH) |
| Dutch Occupational Hygiene Society | NVvA | Registered Certified Occupational Hygienist |
| Finnish Occupational Hygiene Society | FOHS | Certified Occupational Hygienist |
| French Occupational Hygienists Society | SOFHYT | Hygieniste du Travail Certifié (HTC) |
| German Occupational Hygiene Association | DGAH | Certified Occupational Hygienist (DGAH) |
| Hong Kong Institute of Occupational and Environmental Hygiene | HKIOEH | Registered Professional Hygienist (RPH) |
| Iberoamerican Board of Occupational Hygiene | JIHO | Certified Occupational Hygienist (HOC) |
| Italian Industrial Hygiene Association | ICFP | Certified Professional Industrial Hygienist, |
| Japan Association of Working Environment | JAWE | Certified Occupational Hygienists (COH) |
| Malaysian Industrial Hygiene Association | MIHA | Certified Professional Industrial Hygienist (CPIH) |
| Norwegian Occupational Hygiene Association | NYF | Certified Occupational Hygienist (SYH) |
| Occupational and Environmental Health Society (Singapore) | OEHS | Registered Industrial Hygienist (RIH)(SG) |
| Southern African Institute for Occupational Hygiene | SAIOH | Registered Occupational Hygienist (ROH) |
| Swedish Occupational and Environmental Certification Board | SAOEH | Certified Occupational and Environmental Hygienist (COEH) (Swedish Certifierad Yrkes- och miljöhygieniker (CYMH)) |
| Swiss Society for Occupational Hygiene | SSOH | Occupational Hygienist Cert. SSOH |