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David KN Leong|A Pragmatic Approach to Resolving the Crisis of Non-Compliance in the Air Testing of Occupational Health Hazards

Date:2017-07-29Author:
Speaker



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David KN Leong

Ph.D

Chairman

Air Sampling Instruments Committee, American Conference of Governmental Industrial Hygienists (ACGIH), USA


He a Certified Industrial Hygienist (CIH) of American Board of Industrial Hygiene and a Registered Occupational Hygienist (ROH) of Canadian Registration Board of Occupational Hygienist. He is also the chartered professional engineer in Ontario, Canada, and the chartered scientist and chartered Chemist in Royal Society of Chemistry, UK. He was the chief editor of ACGIH new publication “Air Sampling Technologies: Principles and Applications”. 

He has been the former director of occupational hygiene and chief occupational hygienist of the Ontario Ministry of Labour, Canada, in charge of the formulation of regulations and standards, the planning, implementation and evaluation of execution scheme, including the occupational hygiene checking, workplace air monitoring, exposure evaluation, and being responsible for the occupational hygiene laboratory of the Ministry of Labour and the headquarters resource supply service, etc.

In recent years, he has provided the professional consulting and training services to various enterprises, government agencies and institutes, such as Health Canada, Ministry of Manpower in Singapore, Singapore Workforce Development Agency, Ngee Ann Polytechnic in Singapore, China Occupational Safety and Health Association, China Academy of Safety Science and Technology, Guangdong Prevention and Treatment Institute for Occupational Diseases, etc. He is an international expert with 40 years' professional experience in the field of occupational health.


                                                    

Topic of Lecture: A Pragmatic Approach to Resolving the Crisis of Non-Compliance in the Air Testing of Occupational Health Hazards


Abstract: Workplace air testing and monitoring of chemical health hazards is generally required in many countries to ascertain compliance with occupational exposure limits (OELs).  Sampling results are usually evaluated based on a single sample or a few samples taken in a workday. Fears for seeing “high” concentrations amongst sampling results seem to be a general concern, and over concern of exceeding the OELs may distract the duty to maintain or upgrade existing control measures for protection of workers’ health. 

Concentration measurements are influenced by various factors related to the dynamic work environment. This paper will discuss the variability and statistical distribution of concentration measurements, the realistic number of TWA samples for approximating an exposure profile, the needs for routine monitoring and data analysis, and will suggest a pragmatic approach to resolving the crisis of non-compliance. 

Based on China’s current system for air testing, this paper will recommend the monitoring frequency and sampling pattern for workplaces in China, and the suggestion on effective use of limited resources for air testing and monitoring.