Professional Development Course

OEHS 2020 Conference is proud to present two professional development courses (PDCs) leading up to the OEHS 202 Conference.

The courses are formalized learning experiences through in-depth instruction by two field experts, renowned in the field of industrial hygiene in Singapore and in Canada.

Date: TBA

Who should attend?

The two PDCs have been specially designed to be of professional help to:                                    
  • Occupational hygienists;
  • Workplace safety & health professionals;
  • Providers in industrial hygiene assessment and laboratory service
PDC Logistics

There is a separate registration fee for each PDC. 

      - The PDC includes two tea breaks and lunch

The soft copy of PDC handouts will be made available prior to the course date and successful participants will be emailed their soft copy.

*No hardcopy handouts will be provided so please bring your electronic copy for your own use during the course.

Course Certificate 

An electronic course certificate will be issued to PDC participants upon completion of the course


PDC 001 : Smart Design & Implementation of Workplace Air Sampling / Monitoring Strategies

Retired; Former Chief Occupational Hygienist, Ontario Ministry of Labour


Er. David Leong is a Certified Industrial Hygienist (CIH), US American Board of Industrial Hygiene, and a Registered Occupational Hygienist (ROH), Canadian Registration Board of Occupational Hygienist. He is also a Professional Engineer in the Province of Ontario, Canada. He is the retired, former chief occupational hygienist of the Ontario Ministry of Labour.

He serves the American Conference of Governmental Industrial Hygienists (ACGIH) as its Chair of Air Sampling Instruments Committee. He is also the Chief Editor & co-authors for the ACGIH new publication: “Air Sampling Technologies: Principles and Applications”, and its twenty-plus monographs.

He has authored or co-authored published papers on hand-arm vibration, whole-body vibration, indoor air quality, chemical exposures, bioaerosols, exposure standards, etc.

He was engaged in 2013 by Singapore’s Workforce Development Agency and Ngee Ann Polytechnic as a developer and a trainer for three Occupational Hygiene Train-the-Trainer Master courses. More recently, he had been invited to speak at the various occupational hygiene conferences and seminars in China and Taiwan.

Er. Leong received his Ph.D. in chemistry and M. Eng. in environmental engineering from University of Toronto, and M.Sc. (Honours) and B.Sc. in chemistry from Victoria University of Wellington, New Zealand.


How many air samples should you take for an investigation or compliance testing? How can you justify the cost for an occupational hygiene program where there is limited budget and resources.

This full-day PDC will help participants to learn and better understand the following: 

  • OEL compliance issues, and conceptual changes in compliance and enforcement approach. 
  • Evolution and development of Air Sampling/Monitoring Strategies. 
  • New CEN-EN 689:2018 Standard
  • BOHS/NVVA Strategy
  • NIOSH Strategy
  • AIHA Exposure Assessment Strategy
  • Bayesian Decision Analysis
  • Smart Air Sampling Technologies
  • Workplace Approach to Air Sampling/Monitoring Strategies


PDC 002 : Local Exhaust Ventilation System - Principles, Design, Operation, Testing and Maintenance 

Adjunct Associate Professor at National University of Singapore


Adjunct Associate Prof Tan is a Registered Industrial Hygienist (Singapore). He is immediate past Senior Consultant at the OSH Specialists Department, Ministry of Manpower (MOM). His work includes appraisal and testing of LEV systems for controlling hazardous contaminants and protecting workers’ inhalation risk. An author of the MOM Guidelines on Design, Operation and Maintenance of LEV Systems, he is Co-convenor of the LEV Workgroup responsible for developing Singapore Standard Codes of Practice on LEV.

Currently, an Adjunct Associate Professor at the National University of Singapore, he lectures on industrial ventilation - a core subject of the post-graduate degree in Safety, Health and Environmental Technology programme.

He was also a trainer on LEV at the Institute of Engineers Singapore. He holds a 1st-class Honours Degree in Physics, a M.Sc. in Health Physics and a M.Sc. in Industrial Hygiene.


Local exhaust ventilation (LEV) systems are widely used for removal of airborne substances (gases, vapours and aerosols) close to or at their point of origin. A LEV system consists of exhaust hood(s), ducts, air cleaner, exhaust fan and discharge stack.

This full day PDC will help participants to learn and better understand the following: 

  • An overview of these components
  • Design and specifications of a LEV system for optimal operation
  • Best practices for testing and maintenance of LEV systems
  • Troubleshooting problems.

Workplace safety and health practitioners, plant engineers, technical and facility management personnel involving in LEV system appraisal, design or testing will find this PDC very useful.

This is an intermediate industrial hygiene level; an understanding of or a previous course in basic industrial ventilation will be helpful. A scientific calculator is needed for hands-on exercise.