【摘要】 近年来,PM_2.5成为大家关注的重点,四川省是中国PM_2.5高浓度的分布地区之一。利用四川省2000²014年近15年的PM_2.5年均浓度反演数据,按照2005年WHO对PM_2.5的划分标准,采用10μg/m3、15μg/m3、25μg/m3、35μg/m3四个断点将其分为5类。以此为基础分析了四川省PM_2.5的时空分布特征及影响因素。研究结果表明:（1）东部地区PM_2.5浓度明显大于西部,2010²014年四川省PM_2.5年均浓度呈下降趋势;（2）PM_2.5类型以污染最严重的第五类为核心呈半环状向西递减,2010²014年第五类所占比例波动降低;（3）成都市、眉山市等地区PM_2.5浓度较高,2014年PM_2.5年均浓度降低;（4）自然因子、不透水地表、产业结构变化、大气污染防治政策等是影响PM_2.5浓度变化的重要因素。更多还原

【Abstract】 In recent years,PM_2.5has become focus of attention. Sichuan Province is one of the regions with high concentration of PM_2.5in China. This paper used the inversion data of annual average concentration of PM_2.5during the past 15 years from 2000 to 2014 in Sichuan Province,according to the WHO’ s criteria for classifying PM_2.5in 2005,the data is classified as 5 types by4 break points that are 10 μg/m³,15 μg/m³,25 μg/m³ and 35 μg/m³. Based on the data,the paper analyzed the spatial and temporal characteristics of PM_2.5and its influencing factors. The results show that PM_2.5concentration of the east area is higher than that of the west area,it showed a decreasing trend during 2010 2014. The pollution type of PM_2.5,decrease progressively from the fifth type where the pollution is the heaviest to west in the shape of semicircular. And the proportion of the fifth category showed a declining trend from 2010 to 2014. The concentration of PM_2.5is higher in Chengdu,Meishan and so on,but it decreased in 2014. Natural factors,impermeable surface area,industrial structure changes,a series of air pollution control policies are important factors that affect the change of PM_2.5concentration.更多还原