The goals of this study are (1) to establish an integrated atmospheric modeling system for studying the long-range transport of regional air pollutants in order to predict and assess their impact on Taiwan air quality, and further to provide fundamental information to EPA for air pollution management, (2) to revise the PSI when abnormal air pollution events occur, (3) to plan and establish a new acid deposition net work for conducting a long-term monitoring and data analysis, (4) to establish an integrated atmospheric mercury and heavy metals for studying the long-range transport of regional air pollutants, (5) to update and maintain the web site of acid rain study in Taiwan, and (6) to promote regional international collaborations. To date, our achievements are highlighted below: The passing rate of the acid rain samples by the WMO QA/QC standard is 86%, showing the quality of the monitoring network is quite well. Establish an integrated atmospheric mercury and heavy metals for studying the long-range transport of regional air pollutants in order to monitor and assess their impact on Taiwan air quality, and further to provide fundamental information to EPA for air pollution management. The situation of acid rain in urban cities are slightly improving, but getting much more serious in the countryside. Based on a statistic model, the PSI during the abnormal event of the year of 2008 has been recalculated in consideration of Asian dust impact on PM10 measurements. The web site (http://www.acidrain.org.tw) of Taiwan acid rain study has been updated with more information

long-range transport, acid rain, atmospheric mercury