选取10辆符合国六b阶段排放标准的不同燃料和动力类型的轻型汽车（包括插电式混动汽车、增程式混动汽车、汽油车、柴油车和天然气车）作为研究对象，在宁波和昆明轻型整车环境模拟排放实验室开展平原与高原、常温环境下WLTC工况排放测试，研究高原环境下轻型汽车污染物排放特性及影响因素。研究结果表明：以插电式混合动力汽车为例，与标定前相比，完成高原排放标定后其在电量保持（CD）模式下的各项污染物排放呈现不同程度的下降，且能满足GB 18352.6—2016 b阶段限值要求；插电式混合动力汽车和增程式混合动力汽车的各污染物排放普遍低于轻型汽油车、柴油车和天然气车，且电量保持阶段REESS电量的变化影响整车污染物排放；不同燃料和动力类型轻型汽车的CO，CO2，THC，NOx，PN排放主要集中在冷起动阶段，而CO2排放与车辆运行状态直接相关，WLTC工况中各加速阶段CO2排放均呈增加状态。

Ten light-duty vehicles with different fuel and power types that meet the requirements of China Ⅵ-b stage were selected as research objects, including plug-in hybrid, extended-range hybrid, gasoline vehicle, diesel vehicle, and natural gas vehicle. WLTC cycles of plain and plateau were conducted under controlled ambient temperatures in the light-duty vehicle environmental simulation emission laboratory in Ningbo and Kunming, and the emission characteristics of light-duty vehicle pollutants in plateau environment and the influencing factors were studied and analyzed. The results show that, compared to pre-calibration levels, all pollutant emissions of plug-in hybrid electric vehicles in charge depleting(CD) mode reduce to varying degrees and meet the China Ⅵ-b phase limits specified in GB〓18352.6—2016 after plateau emission calibration. The emissions of various pollutants from plug-in hybrid and extended-rang hybrid vehicles are generally lower than those from light-duty vehicles for gasoline, diesel and natural gas. The change in REESS power during the power retention stage affects the overall vehicle pollutant emissions. The emissions of CO, CO2, THC, NOx and PN from light-duty vehicles of different fuels and power types are predominantly concentrated during the cold start stage. CO2 emissions directly correlate with vehicle operating conditions, exhibiting increased levels during all acceleration segments under WLTC testing.