Abstract: The Models-3/CMAQ modeling system was applied to investigate PM₁₀ pollution over the Pearl River Delta (PRD) region during October 2006. Sensitivity analysis was conducted to examine the relationship between the reduction of different source emissions and the consequent change of PM₁₀ concentrations, and to quantify the interaction of air pollution among adjacent cities. The results show that PM₁₀ pollution is a regional-scale issue in PRD. Guangzhou, Foshan, Jiangmen, and Dongguan contribute to the PM₁₀ in PRD remarkably. The relative sensitivity coefficient was proposed to determine the impact of regional pollution sources. The PM₁₀ concentrations in Zhuhai, Jiangmen, Zhongshan, and Foshan cities are significantly influenced by regional source emissions. The intercity transport has been the important factor of PM₁₀ pollution in PRD. To improve the air quality in PRD area, effective control of emission sources should be highly reinforced, together with consentaneous programming, intensive collaboration, joint prevention and control.

Key words: Pearl River Delta (PRD), PM₁₀, regional pollution, relative sensitivity coefficient

摘要： 利用 Models-3/CMAQ 模拟系统, 对珠江三角洲地区 2006 年10 月的大气 PM₁₀ 污染进行模拟研究。通过敏感性分析, 获得各城市 PM₁₀ 浓度随不同污染源削减的变化情况, 量化出城市间空气污染的相互影响。结果显示,珠江三角洲地区已形成 PM₁₀ 区域性污染的格局,广州、佛山、江门、东莞等地是珠三角地区PM₁₀的重要源贡献区域。提出相对敏感系数作为表征外来源影响程度的指标,珠海、江门、中山、佛山等地的 PM₁₀ 浓度受到外来源的显著影响, 城市间输送已成为造成珠三角地区PM₁₀污染的重要因素。对重点城市源的合理削减和有效控制, 以及城市群的统一规划、相互协作、联防联控是改善珠三角地区空气质量的唯一途径。

关键词: 珠江三角洲, PM₁₀, 区域性污染, 相对敏感系数