当前位置：
X-MOL 学术
›
Sci. Total Environ.
›
论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Particulate matter emissions from light-duty gasoline vehicles under different ambient temperatures: Physical properties and chemical compositions
Science of the Total Environment ( IF 9.8 ) Pub Date : 2024-03-19 , DOI: 10.1016/j.scitotenv.2024.171791 Rencheng Zhu , Yangbing Wei , Liqiang He , Menglei Wang , Jingnan Hu , Zhenhua Li , Yitu Lai , Sheng Su
Science of the Total Environment ( IF 9.8 ) Pub Date : 2024-03-19 , DOI: 10.1016/j.scitotenv.2024.171791 Rencheng Zhu , Yangbing Wei , Liqiang He , Menglei Wang , Jingnan Hu , Zhenhua Li , Yitu Lai , Sheng Su
|
Fine particulate matter (PM) from vehicle exhaust is typically emitted at breathing height and thus imposes severe adverse effects on human health and air quality. However, there is currently limited knowledge on the characteristics of PM in exhaust, specifically its chemical components, at different ambient temperatures. Particulate emissions from typical light-duty gasoline vehicles (LDGVs) were investigated on a chassis dynamometer according to the Worldwide Harmonized Light-Duty Test Cycle at ambient temperatures of 38 °C, 28 °C, 15 °C, 5 °C and − 7 °C. The results showed a significant increase in particulate mass (PM) and particle number (PN) emissions with decreasing ambient temperature, particularly during cold starts below 5 °C. The particle size distributions exhibited distinct bimodal patterns, with accumulation-mode (AM) particles (60–125 nm) dominating the gasoline direct injection (GDI) distribution and nucleation-mode (NM) particles (8–12 nm) dominating the port fuel injection (PFI) distribution. AM particles were more temperature-sensitive than NM particles. Lower temperatures produced higher emissions of elements, carbonaceous components, and large-ring polycyclic aromatic hydrocarbons, while water-soluble ions showed an opposite trend. The total toxic equivalent, primarily influenced by benzo[]pyrene, was significantly higher at −7 °C. The penalty distribution of LDGV PM and PN, defined by comparing the emissions at the various temperatures to those at regulated temperatures (23–30 °C), exhibited notable temporal heterogeneity (winter > autumn > spring > summer) and spatial heterogeneity (northern China > southern China). These findings are essential for establishing more stringent vehicle emission standards and improving emission models in cold environments.
更新日期：2024-03-19
京公网安备 11010802027423号