European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy.
Scania, CV AB, 15187 Södertälje, Sweden.
Int J Environ Res Public Health. 2022 May 19;19(10):6199. doi: 10.3390/ijerph19106199.
Road transport contributes significantly to air pollution in cities. Regulations across the globe continuously reduce the limits that vehicles need to respect during their lifetimes. Furthermore, more pollutants are being subject to control with new regulations and, most important, testing tends to be done under real-world conditions on the road. In this study, various portable systems were compared with laboratory-grade equipment with a wide range of emissions, focusing on the lower end, where the measurement uncertainty of the instruments is crucial for the determination of emission limits. The engines were diesel- and compressed natural gas (CNG)-fueled. The results were promising, with relatively small differences between portable emissions measurement systems (PEMSs), portable Fourier transform infrared (FTIR) and quantum cascade laser infrared (QCL-IR) spectrometers, and the respective laboratory-grade analyzers based on chemiluminescence detection (CLD), non-dispersive infrared (NDIR), and FTIR principles. The results also highlighted the need for strict technical regulations regarding accuracy and drift for low emission limits in future.
道路运输是城市空气污染的主要成因之一。为减少车辆在使用周期内的污染物排放，全球各地的法规都在不断收紧限制。此外，随着新法规的出台，更多污染物也受到了管控，最重要的是，测试越来越倾向于在道路上的实际环境中进行。本研究对比了各种不同的便携式系统与实验室级设备的排放情况，重点关注排放限值的测量不确定性对低端仪器的关键性影响。所研究的发动机为柴油和压缩天然气（CNG）燃料。结果令人鼓舞，便携式排放测量系统（PEMS）、便携式傅里叶变换红外（FTIR）和量子级联激光红外（QCL-IR）光谱仪，以及基于化学发光检测（CLD）、非分散红外（NDIR）和 FTIR 原理的相应实验室级分析仪之间的差异相对较小。结果还强调了未来对于低排放限值的准确性和漂移性，需要制定严格的技术法规。
