In CPCB, he was associated with the development of emission and effluent standards and environmental impact assessment studies for nearly 10 years. He has been a visiting professor at the University of Guelph, Canada and Kyoto University, Japan. He works in areas of air quality monitoring, modeling, and management, exposure assessment and simulation.
He has published/presented over 100 papers in national and international journals and conferences. He is the principal investigator of several international research projects from Norway, France, World Bank, USA and various agencies in India, and participated in several national and international committees on environmental protection.