Education

• 1978-1982, B.S. in geochemistry, University of Science and Technology of China, Hefei, China
• 1982-1983, Graduate School, Chinese Academy of Sciences, Beijing, China
• 1983-1985, M.S. in atmospheric chemistry, Florida State University, Tallahassee, Florida, USA
• 1986-1989, Ph.D. in atmospheric chemistry, Jointly at Florida State University, Tallahassee, Florida, and Advanced Study Program, National Center for Atmospheric Research, Boulder, Colorado. USA

Professional Appointments

• 1989-1990, Post-doctoral Fellow, National Center for Atmospheric Research, Boulder, Colorado.
• 1990-2020, Research Scientist, Science and Technology Branch, Department of the Environment, Government of Canada, Toronto, Ontario, Canada.
• 1994-now Adjunct Professor, York University, Toronto, Ontario, Canada.
• 2012-2013 Senior Visiting Research Fellow, Chemical Sciences Division (CSD), National Oceanic and Atmospheric Administration (NOAA) and Cooperative Institute of Research of Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado, USA
• 2017-now Adjunct Professor, Institute of Urban Environment, Chinese Academy of Sciences
• 2019-now Chair Professor, College of Environmental Science and Engineering, Peking University, Beijing, China

Research Interests

• Long term changes in aerosol composition and chemical tracers in pristine environments
• Carbonaceous aerosol characterization; including organic carbon speciation, black carbon evolution and deposition, and toxics substance measurements, source profiling; in urban and pristine environments
• Laboratory and field studies of kinetics of gas and aerosol interactions and chemical kinetics of organics in aerosols; box modelling and lagrangian box modelling of chemical reaction systems
• Emission research on particles and VOC/SVOCs from major industrial and resource development sources (up to hundreds of km2 in size), emissions from auto engine exhaust and emissions from agricultural practices. All emission research includes quantitation of emission rates, emission factors, at-source and near-source chemical and physical processes
• Aircraft measurements of atmospheric chemistry and chemical processes on regional and remote scales with applications to emissions and processes of atmospheric particles and trace gases; research lasting over 25 years