为了解昆明市十年来交通污染状况的变化，于１９８６年４月和１９９６年４月分别对该市的交通污染状况进行了调查对该市市区三个主要交通路口进行了每天３次，连续７ｄ的监测：计数每小时机动车流量，并对大气污染物和噪声进行了测定结果：１９９６年三个路口每小时机动车流量比１９８６年平均增加了２０９～２７７倍（Ｐ＜００１）；大气中ＮＯｘ，ＣＯ的浓度比１９８６年增高，其中ＮＯｘ的增高有显著性意义（Ｐ＜００５），而悬浮颗粒物浓度比１９８６年降低（Ｐ＜００１），但仍然超过国家标准；各点等效声级平均分别增长０８～２４ｄＢ（Ａ）（Ｐ值００７８～０００２）本研究结果表明，１０ａ来该市机动车流量剧增，导致机动车废气和噪声污染加重；城市大气污染已以交通污染为主 In order to understand the change of traffic pollution in Kunming over the past ten years, the traffic pollution status of the city was investigated in April 1986 and April 1996 respectively. The three major traffic junctions in the urban area were surveyed three times a day, Continuous 7d monitoring: Hourly motor vehicle traffic was counted and air pollutants and noise were measured  Results: Hourly motor traffic increased by 2.09-277 times (averaged from 1986) at three intersections in 1996 P <001). The concentrations of NOx and CO in the atmosphere were higher than those in 1986, and the increase of NOx was significant (P <005), while the concentration of suspended particulates was lower than that of 1986 (P <001) , But still surpassed the national standard. The equivalent sound level at each point increased by an average of 08 ~ 24 dB (A) (P = 0078 ~ 0002). The results of this study showed that the traffic volume The sharp increase in motor vehicle emissions and noise pollution; urban air pollution has been dominated by traffic pollution 