在青海省选择海拔为1 900 m，2 200 m，2 400 m和3 000 m的4个环境点，对一辆轻型柴油车按照实际驾驶排放（RDE）测试要求进行试验，并利用移动平均窗口法处理数据，得到车辆实际驾驶排放数据。对车辆的排放结果进行了评估，并分析了海拔对排放的影响。结果表明：随着海拔的增加，CO与PN排放先增加后减小，在2 400 m时出现最大值，NOx排放先减小后增加，在2 400 m处出现最小值；4个海拔点CO与PN排放值均低于法规限值，NOx排放值均高于法规限值，符合性系数分别为7.44，7.11，6.44，8。

The real driving emissions of a lightduty diesel vehicle at plateau areas of 1 900 m, 2 200 m, 2 400 m and 3 000 m in Qinghai province were tested and the collected data were processed with the moving average window method to form the emission data. The vehicle emission results were evaluated and the effects of altitude on emissions were analyzed. The results indicate that the CO and PN emissions first increase and then decrease with the increase of altitude and reach the peak at 2 400 m. However, NOx emissions first decrease and then increase and reach the minimum at 2 400 m. In addition, CO and PN emissions and NOx emissions in four areas are lower and higher than the regulated limits respectively and the conformity factors are 7.44, 7.11, 6.44 and 8.