Professor Tsang is an environmental scientist by training, specialising in the application of nanotechnology to remove pollutants from various types of environmental samples. In recent years, he has been commissioned by various bodies, such as the Agriculture, Fisheries and Conservation Department, the Environment and Conservation Fund, the Quality Education Fund, and private funds to conduct contract research projects. Professor Tsang also specialises in environmental education research, particularly in the evaluation of environmental education programmes, and was one of the pioneers of the Green School initiative. In recognition of his role in promoting collaboration between Hong Kong and Chinese Mainland, Professor Tsang was appointed visiting professor by Northeast Normal University and South China Normal University. He was also appointed founding director of the Hong Kong and Guangzhou Centre for Environmental and Science Education in South China Normal University.

Professor Tsang is active in the community, having been appointed chairman and member of numerous high-level government committees, such as the Transport Advisory Committee, the Advisory Council on the Environment, and the Environment and Conservation Fund. He also acted as a community leader in promoting green culture through his role as the chairman of Green Power, a major green NGO in Hong Kong, and served as a member of funding bodies, such as the Environment and Conservation Fund, for vetting research applications. Over the years, Professor Tsang has secured over 10 million HKD in research and contract research funding. His research findings were published in leading journals such as Applied Catalysis B Environmental, Chemical Engineering Journal, Journal of Hazardous Materials, Chemosphere and Environmental Education Research. The total number of published refereed papers is over 80. 

Internationally, Professor Tsang was appointed as a panel member (outreach panel) of the International Year of Global Understanding, launched by the International Geographical Union and UNESCO. 

Listed in chronological order

member, transport advisory committee (2001-2007) HKSAR

Chairman, Quality Taxi services steering committee (2004-2007) HKSAR

member, Quality tourism services steering committee (2004-2007) HKSAR

member Marine and country parks board(1999-2005) HKSAR

Chairman public Relations committee(2003-2005) Marine and country parks board HKSAR

Member, Environment and Conservation Fund, (1996-2002) HKSAR

Member Research Vetting committee environment and conservation fund HKSAR (1996-2004)

Member, Marine mammal conservation committee AFCD HKSAR (1999-2005)

Chairman, Green Power(green group)Member,

Environmental Campaign committee,Member,

environmental pOlicy Working Group, HKSAR

Advisor (Environmental Education) Elengantia College

Visiting Professor, South Chiona Normal University(Environmental science/life science)) since 2002 and 2012 respectively

Advisor HK Ubion for Young Leaders HKUYL from 2013

Director, Environmental Education Centre, South China Normal University

Visiting Professor, Northeast Normal University China since 2000

member public education committee Hk gReen BUilding council from 1/1 2017

member of the Outreach Panel, United Nations Year of Global Understanding (UN-IYGU) International Geographical Union(IGU)/UNESCO

http://global-understanding.info/

member of editorial board from February 2012, International Journal of New Innovations: Science, Technology and Management

Associate Director, UNESCO UNEVOC Hong Kong from March 2012

Member, Environmental Education and Community Action Projects Vetting Committee, Environmental Campaign Committee HKSAR

Advisor, HK Youth Leaders Group

Member Multi-stakeholder steering group, Sino-Forest Applied Research Centre for PRD Environment, Baptist University of Hong Kong(ARCPE)

Member, Global Spotter Network, Katerva Sustainability Award

member public education committee HK Green Building Council from 1-1 2017

Member Advisory Council on the Environment(ACE) HKSAR from 1/2013

Member Environmental Impact Assessment sub-committee ACE HKSAR

Member Nature Conservation sub-committee ACE HKSAR

Member Management Comittee Marine Ecology Enhancement Fund Airport Authority HK from 25/10/2016