中文摘要：

采用MM5-CMAQ模式系统模拟研究了2006—2008年间华北火电厂脱硫工程实施对奥运期间区域空气质量的影响，并对比研究了脱硫前后华北地区二氧化硫（SO2）、硫酸盐气溶胶（ASO4）浓度及能见度的变化.结果表明，华北火电厂脱硫可有效削减区域SO2和ASO4浓度，在奥运气象条件下，脱硫促使京津冀、山东北部、山西东部、内蒙河套地区SO2浓度下降1-10 ppbv，而大部分地区ASO4浓度下降约1 μg·m-3.北京是SO2浓度降低最明显的地区，其SO2浓度下降百分比超过50%；太行山脉沿线、泰山地区是ASO4浓度下降最明显的地区，浓度降低达2 μg·m-3.火电厂脱硫同时促使北京、河北大部、山西北部及内蒙南部地区的能见度上升0.5 km以上.

英文摘要：

The MM5-CMAQ air quality modeling system was applied to estimate impacts of power plant desulfurization on regional air quality over North China Plain during the Olympic Games. By comparing the difference of two model simulations with and without desulfurization, it can be found that： 1） Power plant desulfurization decreased SO2concentration by 1~10 ppbv in Beijing-Tianjin-Hebei, North Shandong, East Shanxi and Hetao area in Inner Mongolia,and decrease ASO4 concentration by 1 μg m-3in most regions in North China Plain. 2） The most significant regions of SO2 and ASO4 reduction appeared in Beijing and eastern slope along Taihang Moutains and Moutain Tai, with magnitudes of 50% and 2 μg m-3, respectively. 3） Power plant desulfurization increased visibility in Beijing, most areas of Hebei, North Shanxi and South Inner Mongolia by more than 0.5 km.