He has represented India in many international meetings, seminars and workshops organized by UNEP, USEPA, WHO, World Bank, UNIDO and many others. Dr. Sengupta has published more than 250 technical reports while working in CPCB and also presented and published more than 50 papers in National and International peer reviewed Journals.
During his long career, he has been Chairman of Environmental & Waste management committee of Bureau of Indian Standards (BIS), CHD 32, Chairman of core and peer committee of Ministry of Environment and Forests (MoEF) and Administrative Staff College of India (ASCI) on Energy Information Administration (EIA) manuals, Chairman of Technical Committee of Ozone cell of MoEF, Member of Research Advisory Council of National Environmental Engineering Research Institute (NEERI) and Council of Scientific and Industrial Research, Member of sub-committee of Climate and Air Pollution of Planning Commission, Govt. of India, Technical environmental expert of National Accreditation Board for Certification Bodies, (NABCB) and Member of Accreditation Committee of NABAT, Quality council of India, New Delhi, Member of Research Advisory Council of Maharashtra, State Pollution Control Board (SPCB), Visiting faculty of ASCI, Hyderabad, Consultant of World Bank, Washington, USA, Consultant of International Council for Clean Transportation (ICCT), Washington, USA, Consultant of Heirich Boll Stiftung, Berlin, Germany, Technical Advisor of Blacksmith Institute, New York, USA etc.
Presently, he is member of Environment Appraisal Committee (Industry), MoEF, New Delhi for grant of environmental clearance for industrial projects.