The spatial distribution of the simulated annual concentration of SO2 and NO2 in five cities (Mianyang,Deyang,Chengdu,Meishan,and Leshan) among Chengdu Plain were figured out by Geostatistics.The results show that SO2 has strong spatial relevance in Deyang and Meishan,moderate in Mianyang and Chengdu,and weak in Leshan,while NO2 has strong spatial relevance in Deyang and Meishan,moderate in Mianyang,Chengdu and Leshan.The major ranges of S02 in Mianyang,Deyang,Chengdu,Meishan,and Leshan are 145,116,83,105 and 153 km respectively.The major ranges of NO2 in these cities are 145,90,66,105 and 153 km respectively.Based on the essential meaning of range in Geostatistics,a quantitative criterion was proposed to identify the urban agglomeration atmospheric pollution.If the sum of atmospheric pollutant ranges is greater than the distance between geometric centers of two cities,the atmospheric pollution in the two cities presents to have spatial relevance or interaction.%采用地统计方法对成都平原5个城市(绵阳市、德阳市、成都市、眉山市、乐山市)大气中SO2和NO2的年均浓度模拟数据进行了空间分布特征研究.分析表明,SO2在德阳市、眉山市具有强烈的空间相关性,在绵阳市、成都市具有中等的空间相关性,乐山市SO2空间相关性较弱；NO2在德阳市、眉山市具有强烈的空间相关性,在绵阳市、成都市和乐山市具有中等的空间相关性.绵阳、德阳、成都、眉山和乐山5个城市的SO2在长轴方向的变程分别为145、116、83、105、153 km；NO2在长轴方向的变程分别为145、90、66、105、153 km.根据地统计学中变程的物理意义,提出判断构成“城市群大气污染”的定量依据,即相邻城市大气污染物变程之和若大于城市几何中心间的直线距离,则2个城市的大气污染物存在空间关联或相互影响.
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