Emissions data are essential background information for air pollution control. In order to monitor the trend of emissions data, the National Air Pollution Emission Inventory is updated, as originally planned, every three years. With this schedule, however, even the most recently updated emissions data are three to four years old and do not reflect current air pollution emission conditions. For instance, the last version of the national emissions database (TEDS 6.1) completed last year was based on the emissions data of 2003. Hence, the update schedule for emissions data is revised in this fiscal year and divided according to data resolution into the following three categories to better satisfy the use of emissions data: short-term update for monthly variation of emissions data, annul update for city/county emissions data, and tri-annual update for base-year emissions data in grid resolution. The update program to be executed in this fiscal year is the annual update for city/county emissions data. More specifically, the emissions data of the last fiscal year (2006) was estimated and was used to correct and predict the emissions trend in the coming years. Additionally, the results of emission reduction under different reduction scenarios were compared and served as a reference for drafting control directives in the future. Also, discussions and supplementary survey on the uncertainty of emissions data of major pollution sources, such as fugitive dust from paved roads and from exposed riverbeds, were conducted as a preparatory work for the next tri-annual update for base-year emissions data to increase completeness and correctness thereof. Apart from updating the emissions data, this year’s study also include: review and revision of cost per ton reduced, so as to re-assess air degradation; and introduction of AirControlNET (ACN), a database tool developed by the U.S. Environmental Protection Agency for conducting air pollution control cost analysis, so as to assist in the planning of air pollution control strategies. Furthermore, in support of the administrative affairs, data related to air degradation was provided to the Directorate-General of Budget, Accounting and Statistics for calculating the Green GDP and assistance in assessing air quality improvement scores for city/county SIP assessment system and updating the emissions inventory website.

TEDS, point source, area source, line source, air degradation, Cost per Ton Reduced