Field Measurements of Gasoline Direct Injection Emission Factors: Spatial and Seasonal Variability

Environmental Science & Technology
Naomi ZimmermanGreg Evans

Abstract

Four field campaigns were conducted between February 2014 and January 2015 to measure emissions from light-duty gasoline direct injection (GDI) vehicles (2013 Ford Focus) in an urban near-road environment in Toronto, Canada. Measurements of CO2, CO, NOx, black carbon (BC), benzene, toluene, ethylbenzene-xylenes (BTEX), and size-resolved particle number (PN) were recorded 15 m from the roadway and converted to fuel-based emission factors (EFs). Other than for NOx and CO, the GDI engine had elevated emissions compared to the Toronto fleet, with BC EFs in the 73rd percentile, BTEX EFs in the 80-90th percentile, and PN EFs in the 75th percentile during wintertime measurements. Additionally, for three campaigns, a second platform for measuring PN and CO2 was placed 1.5-3 m from the roadway to quantify changes in PN with distance from point of emission. GDI vehicle PN EFs were found to increase by up to 240% with increasing distance from the roadway, predominantly due to an increasing fraction of sub-40 nm particles. PN and BC EFs from the same engine technology were also measured in the laboratory. BC EFs agreed within 20% between the laboratory and real-world measurements; however, laboratory PN EFs were an order of magnitude lower...Continue Reading

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Citations

Jul 3, 2016·The Science of the Total Environment·Caitlin L MaikawaKrystal J Godri Pollitt
Jul 14, 2016·Environmental Science & Technology·Naomi ZimmermanGreg J Evans
Mar 2, 2018·International Journal of Environmental Research and Public Health·Caitlin L MaikawaKrystal J Godri Pollitt
Feb 25, 2017·Marine Pollution Bulletin·Brian K GullettEdith Holder
Jun 6, 2021·Environmental Pollution·Wenjiao DuanJiaxian Zhu
Jun 22, 2021·Journal of Environmental Health Science & Engineering·Pei Yang HsiehMarkus Hilpert
Feb 25, 2017·Environmental Science & Technology·Jonathan M WangGreg J Evans
Feb 23, 2019·Environmental Science & Technology·Tengyu LiuChak K Chan
Dec 31, 2020·Environmental Science & Technology·Xiangxinyue MengMin Hu
Mar 28, 2017··Ameya JoshiTimothy Johnson

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