Application, assessment and certification
Apply for RAIH (SG) or RIH (SG) recognition.
The RIH (SG) and RAIH (SG) Scheme accredits industrial and occupational hygiene professionals practising in Singapore through a structured review of education, experience, ethics, and professional competency.
Scheme overview
Professional recognition for industrial and occupational hygiene practice.
Industrial hygiene, also known as occupational hygiene, is a specialised field dedicated to anticipating, recognising, evaluating, and controlling health hazards in the workplace. It supports healthier and safer work environments by applying scientific and professional judgement to workplace exposure risks.
In Singapore, industrial and occupational hygiene professionals provide services to manage workplace health hazards, including noise monitoring and control, air sampling, chemical hazard management, and other exposure assessment activities.
The RIH (SG) and RAIH (SG) Scheme was established by the Occupational and Environmental Health Society, Singapore and is administered by the Registered Industrial Hygienist Board under OEHS. It provides professional recognition, enhances standards, and supports continual learning and education in industrial hygiene practice.
Invitation to apply
Industrial and occupational hygiene professionals or practitioners practising in Singapore may apply for RAIH (SG) or RIH (SG), subject to the published criteria and assessment route.
Application requirements
RAIH (SG) and RIH (SG) application routes.
| Designation | Education and coursework | Experience | Assessment route |
|---|---|---|---|
| RAIH (SG) | Basic degree in occupational hygiene, engineering, science, or a related field. | One year of practical experience for candidates with an OH/IH degree. Two years of practical experience for candidates with a non-OH/IH degree or Specialist Diploma in Occupational Hygiene. | Professional competency is assessed through an interview. |
| RIH (SG) | Basic degree in occupational hygiene, engineering, science, or a related field, with at least 150 hours of OH/IH coursework. | At least four years of practical experience in occupational or industrial hygiene. | Professional competency is assessed through an interview. Candidates without a recognised OH/IH degree, or candidates with SDOH, may need to pass a written examination before the interview. |
Application route visuals
Review the published RAIH (SG) and RIH (SG) application pathways.
Two-stage process
From document submission to written or oral assessment.
Submit application
Applicants submit the completed application form electronically to the Secretariat, including the signed and scanned final page, supporting documents, and the non-refundable administration fee.
Board review
The RIH Board reviews the application and determines whether the candidate may proceed to Stage B and which assessment route applies.
Written examination where required
Candidates who require a written examination will receive at least one month of notice. The examination is expected to take approximately three to four hours and covers industrial hygiene domains.
Oral interview
Candidates proceed to an oral interview of approximately one to two hours. They may be required to prepare a written paper or PowerPoint presentation to demonstrate professional competency.
Supporting documents
Prepare complete evidence before submission.
- Application form Completed candidate details, designation applied for, declaration, signature page, and contact information.
- IH coursework form RIH applicants should include the industrial hygiene coursework form and supporting evidence for the required OH/IH coursework hours.
- Official university transcript Candidates must provide official transcript evidence to support education and qualification review.
- Experience evidence Employment history, practical OH/IH responsibilities, workplace assessment experience, and examples of exposure assessment or hazard control work.
- Professional standing Confirmation of ethical practice, professional conduct, and willingness to comply with the Code of Ethics and re-certification expectations.
Assessment route
Assessment depends on qualification and professional background.
Applicants with a recognised industrial or occupational hygiene degree or diploma, or those currently certified under an internationally recognised industrial or occupational hygiene accreditation programme, will generally be required to complete only the oral assessment.
Examples of internationally recognised accreditation programmes referenced in the published application information include BGC’s CIH, BOHS’s COH, and AIOH’s COH.
The RIH Board may require a written examination in exceptional cases where there is relevant justification to evaluate professional competence.
Certification and re-certification
Accreditation is granted for a five-year certification period.
S$150
A non-refundable administration fee applies at application submission stage.
S$325
Successful RAIH (SG) applicants are required to pay an accreditation fee for the first five years. The same fee applies for re-certification.
S$650
Successful RIH (SG) applicants are required to pay an accreditation fee for the first five years. The same fee applies for re-certification.
Every five years
Certified practitioners must maintain competency, act professionally under the Code of Ethics, and meet re-certification criteria assessed by the RIH Board.