CHRA%20Manual%203rd%20edition%202018 - Manual of Recommended Practice - Chemical Health Risk Assessment (CHRA)

Sep 21, 2026

Upload by Sarah

A Manual of Recommended Practice for conducting Chemical Health Risk Assessment (CHRA) to assess health risks from workplace chemicals hazardous to health (CHTH). The manual provides a standardised protocol for assessors, and helps employers and occupational safety and health practitioners understand the assessment scope for objective report review. It aligns the assessment with the Occupational Safety and Health (Use and Standard of Exposure of Chemicals Hazardous to Health) Regulations 2000 (USECHH Regulations) and supports clear steps from planning and information gathering to reporting, reassessment, and control of records.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages149

Reading Time6 h 15 min

AccessFree to download

Chapter 1: Introduction

Scope

Purpose and Objectives of a Chemical Health Risk Assessment

Content of Chemical Health Risk Assessment

Assessment Strategies

Assessment Concept

Select Assessor

Steps in CHRA

Chapter 2: Gather Information

Information to be Gathered

Sources of Information

Chapter 3: Divide into Work Unit

Categorisation of a Work Unit

Practical Steps to Identify Work Unit

Chapter 4: Determine Degree of Hazard

Identification of Hazard

Degree of Hazard

Example on Determination of Degree of Hazard by Inhalation and Dermal

Chapter 5: Assess Exposure

Possible Routes of Exposure

Evaluate Exposure for Inhalation

Evaluate Exposure for Dermal

Ingestion Assessment

Chapter 6: Risk Determination

Level of Risk for Inhalation Exposure

Level of Risk for Dermal Exposure

Chapter 7: Control Measures

Types of Control Measures

Adequacy of Control Measures

Specific Control Measures

Chapter 8: Exposure Monitoring Programme

Chapter 9: Medical Surveillance Programme

Chapter 10: Conclude, Recommend and Prioritise

Assessment Conclusion

Actions to be Taken

Specific Actions to be Taken

Action Priority

Chapter 11: Report Writing

Report Title Page

Executive Summary

Table of Contents

Introduction

Process and Work Unit Description

Assessment Methodology

Assessment Findings

Discussion

Recommendation on Action to be Taken

References

Appendices

Chapter 12: Reassessment

Chapter 13: Control of Records

Medical Surveillance Programmes

Training Programmes

PPE Programmes

3rd Edition First reprint 2018 1 This guideline may be cited as a Manual of Recommended Practice on the Assessment of the Health Risks Arising from the Use of Chemicals Hazardous to Health at the Workplace 3rd Edition. The manual provides practical guidance and advice for conducting an assessment of risk to health related to the use of chemicals hazardous to health (CHTH) at the workplace for compliance to the requirements of the Occupational Safety and Health (Use and Standard of Exposure of Chemicals Hazardous to Health) Regulations 2000 or as amended hereinafter referred to as USECHH Regulations. This manual specifically provides a standardised protocol for assessor to conduct a full assessment using a method known as Chemical Health Risk Assessment (CHRA) . This manual has also been designed to assist employers and occupational safety and health practitioners to understand the scope of the assessment sufficiently in their objective review of the report. This manual will be reviewed from time to time. Written comments from any interested persons or parties are welcomed. These should be sent to the Department of Occupational Safety and Health (DOSH) for further consideration in improving the manual. Director General Department of Occupational Safety and Health Malaysia 2017 2 A Manual of Recommended Practice on ASSESSMENT OF THE HEALTH RISKS ARISING FROM THE USE OF CHEMICALS HAZARDOUS TO HEALTH AT THE WORKPLACE The Department of Occupational Safety and Health (DOSH) wishes to thank and acknowledge the members of the Drafting Committee (Jawatankuasa Penggubalan bagi Semakan/Pindaan‘Assessment of the Health Risks Arising from the Use of Chemicals Hazardous to Health at the Workplace 3rd Edition’) for their contributions towards the preparation of this manual. Drafting Committee 1. Ir. Hj. Anuar bin Mohd Mokhtar 2. Ir. Dr. Majahar bin Abd. Rahman 3. Shabanon binti Mohd Sharif 4. Ir. Roslenda binti Hasan 5. Hamidi bin Saidin 6. Rusnah binti Nanyan 7. Noor Fazira binti Ab Aziz 8. Hj. Mohd Salleh bin Abd Rahman 9. Dr. Rajinderjit Singh Hullon 10. Sulaiman bin R. Rahman 11. Hjh. Wan Sabrina binti Wan Mohamad 12. Azizin bin Zainudin 13. Marina binti Zainal Farid 14. Hjh. Noormahani binti Harun 15. Marina Yong Poh Nyuk 16. Norhamimi binti Mohd Yusof 17. Suhaily binti Amran 18. Mohd Hafizullah bin Harun 19. Syarikin binti Mat Nayah DOSH (Chairman from 2009 until August 2014) DOSH (Chairman from September 2014 to 2017) DOSH DOSH DOSH DOSH DOSH DOSH (2009-2017) DOSH DOSH (2009 – 2016) Shell Malaysia Trading Sdn. Bhd. Petroliam Nasional Berhad (2009 – 2014) Petroliam Nasional Berhad (2015 – 2017) Malaysian Industrial Hygiene Association Malaysian Industrial Hygiene Association ExxonMobil Exploration and Production Malaysia Inc. National Institute of Occupational Safety and Health (2009-2017) DOSH DOSH (Secretariat) We also wish to thank individuals who have directly or indirectly contributed in the preparation of this manual. 3rd Edition First reprint 2018 3 ABBREVIATION TERMINOLOGY CHAPTER 1: INTRODUCTION 1.1 Scope 1.2 Purpose and Objectives of a Chemical Health Risk Assessment 1.3 Content of Chemical Health Risk Assessment 1.4 Assessment Strategies 1.5 Assessment Concept 1.6 Select Assessor 1.7 Steps in CHRA CHAPTER 2: GATHER INFORMATION 2.1 Information to be Gathered 2.2 Sources of Information CHAPTER 3: DIVIDE INTO WORK UNIT 3.1 Categorisation of a Work Unit 3.2 Practical Steps to Identify Work Unit CHAPTER 4: DETERMINE DEGREE OF HAZARD 4.1 Identification of Hazard 4.2 Degree of Hazard 4.3 Example on Determination of Degree of Hazard by Inhalation and Dermal CHAPTER 5: ASSESS EXPOSURE 5.1 Possible Routes of Exposure 5.2 Evaluate Exposure for Inhalation 5.3 Evaluate Exposure for Dermal 5.4 Ingestion Assessment CHAPTER 6: RISK DETERMINATION 6.1 Level of Risk for Inhalation Exposure 6.

FAQs

What is the purpose of a Chemical Health Risk Assessment (CHRA) under USECHH Regulations?

To assess health risks arising from the use of chemicals hazardous to health (CHTH) in the workplace for compliance with the USECHH Regulations.

Which main steps does the manual cover for completing a CHRA?

It outlines a structured process including introduction and scope, gathering information, dividing into work units, determining degree of hazard, assessing exposure, determining risk, and then moving through control measures, monitoring, medical surveillance, conclusion and reporting.

What are the expectations for report writing and follow-up after the assessment?

The manual specifies a report-writing structure (e.g., executive summary, methodology, findings, recommendations) and includes chapters on reassessment and control of records, including medical surveillance, training, and PPE programmes.

Sep 21, 2026

Upload by Sarah