The American Society of Heating, Refrigerating and Air-conditioning Engineers (ASHRAE)

World Health Organization (WHO)

The United States Environmental Protection Agency (USEPA)

Indoor Air Quality Information Centre

National Air Duct Cleaning Association (NADCA)


Hong Kong Environmental Protection Department (HKEPD)

Heating and Ventilating Contractors Association (HVCA)

National Institute of Occupational Safety and Health (NIOSH)


The American Conference of Governmental Industrial Hygienists, Inc. (ACGIH)

American Indoor Air Quality Council

HKSAR Government- Electrical and Mechanical Service Department Approved Contractor

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