Department of Chemistry and Biochemistry, University of Denver , Denver Colorado 80208, United States.
Environ Sci Technol. 2015 Feb 3;49(3):1639-45. doi: 10.1021/es505534e. Epub 2015 Jan 21.
The introduction of particulate and oxides of nitrogen (NOx) after-treatment controls on heavy-duty vehicles has spurred the need for fleet emissions data to monitor their reliability and effectiveness. The University of Denver has developed a new method for rapidly measuring heavy-duty vehicles for gaseous and particulate fuel specific emissions. The method was recently used to collect 3088 measurements at a Port of Los Angeles location and a weigh station on I-5 in northern California. The weigh station NOx emissions for 2014 models are 73% lower than 2010 models (3.8 vs 13.9 gNOx/kg of fuel) and look to continue to decrease with newer models. The Port site has a heavy-duty fleet that has been entirely equipped with diesel particulate filters since 2010. Total particulate mass and black carbon measurements showed that only 3% of the Port vehicles measured exceed expected emission limits with mean gPM/kg of fuel emissions of 0.031 ± 0.007 and mean gBC/kg of fuel emissions of 0.020 ± 0.003. Mean particulate emissions were higher for the older weigh station fleet but 2011 and newer trucks gPM/kg of fuel emissions were nevertheless more than a factor of 30 lower than the means for pre-DPF (2007 and older) model years.
重型车辆中颗粒物和氮氧化物（NOx）后处理控制的引入，促使人们需要对车队排放数据进行监测，以评估其可靠性和有效性。丹佛大学开发了一种用于快速测量重型车辆气态和颗粒燃料特定排放的新方法。该方法最近在洛杉矶港一个地点和加利福尼亚州北部 I-5 上的一个称重站收集了 3088 次测量数据。2014 年车型的称重站 NOx 排放量比 2010 年车型低 73%（3.8 克与 13.9 克 NOx/千克燃料），且随着更新车型的推出，排放量有望继续下降。自 2010 年以来，该港口的重型车队已全部配备了柴油颗粒过滤器。总颗粒物质量和黑碳测量表明，只有 3%的港口车辆超过预期的排放限值，平均燃料每克颗粒物排放量为 0.031 ± 0.007，平均燃料每克黑碳排放量为 0.020 ± 0.003。较旧的称重站车队的颗粒物排放量更高，但 2011 年及更新的卡车每克燃料颗粒物排放量仍比未装 DPF（2007 年及更早）车型低 30 多倍。
