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

World Health Organization (WHO)

The United States Environmental Protection Agency (USEPA)
(http://www.epa.gov/)

Indoor Air Quality Information Centre

National Air Duct Cleaning Association (NADCA)

(http://www.nadca.com)

Hong Kong Environmental Protection Department (HKEPD)

Heating and Ventilating Contractors’ Association (HVCA)
(www.hvca.org.uk)

National Institute of Occupational Safety and Health (NIOSH)

(http://www.cdc.gov/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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