pollution. A smaller number of papers dealt with atmospheric chemistry and air pollution. Out of these papers, the majority dealt with urban pollution, and only rarely with larger than regional-scale characterization. Eighty-seven of these reported results from studies of precipitation and aerosol chemistry, especially acid rain, and 25 of these papers focused primarily on aerosols.

A similar indication of the scope of atmospheric chemistry research in China is given by the proceedings of the International Conference on Global and Regional Environmental Atmospheric Chemistry held in Beijing, May 3–10, 1990. At that conference, 89 of the 173 platform or poster papers reported mainly regional and urban-scale Chinese research, and of these, 38 papers addressed acid rain. Twelve papers dealt with urban and regional oxidants and trace gases. Eight papers on aerosol studies reported measurements of chemical composition. Only eight papers discussed topics in the remote atmosphere, four of them on the stratospheric species and the other four on shipboard measurements of tropospheric trace gases and aerosols.

This record of publications indicates a preponderance of air quality and environmental impact studies that have an immediate importance to the lives of people in China. Atmospheric chemistry studies related to global climate change are far fewer. Yet, the experience gained in the environmental impact studies have laid a basis on which larger scale investigations can be conducted when future opportunities arise.

Atmospheric chemistry research is carried out primarily in a few, relatively large institutes. These include the Chinese Research Academy of Environmental Sciences (CRAES) of the National Environmental Protection Agency (NEPA), the Research Center for Eco-Environmental Sciences (RCEES) of the Chinese Academy of Sciences (CAS), the Chinese Academy of Meteorological Sciences (CAMS) of the State Meteorological Administration (SMA), CAS Institute of Atmospheric Physics, CAS University of Science and Technology of China, Peking University, and Nanjing University. Many of these institutes are involved in cooperative international research projects. However, collaboration or coordination of research activities among these institutes appears to be limited.

Trace Gases and Oxidants

Research on trace gases other than urban air pollutants started in recent years when it was realized that all of the trace gases other than carbon dioxide (CO2) contribute equally to climate change as does CO2. Much of the attention has been on methane (CH4), nitrous



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