Dependence of pollutant emission factors and fuel consumption on driving conditions and gasoline vehicle types

Liang Qu, Weiwei Wang, Mengliang Li, Xiaohong Xu, Zongbo Shi, Hongjun Mao, Taosheng Jin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Vehicle types, technologies, and driving conditions are key factors affecting emission factors and fuel consumption. In this study, we measured the hydrocarbon (HC), carbon monoxide (CO), and nitrogen oxide (NOx) emission factors, and fuel consumption of vehicles with a (1) carburetor (CVs), (2) multipoint injection technology and three-way catalyst (MTVs), and (3) multipoint injection technology, three-way catalyst, and exhaust gas recirculation device (MTEVs) under real driving conditions using an OBS-2200 portable emission measurement system. The results showed that both the distance- and fuel-based HC, CO, and NOx emission factors of CVs were 2.7–6.6 times higher than those of MTVs and MTEVs. The average incomplete fuel conversion rates (IFCRs) of CVs were 3.8 and 4.4 times higher than those of MTVs and MTEVs, respectively. The molar ratios of the CO/HC pollutants were 7.6, 5.6, and 2.8 for CVs, MTVs, and MTEVs. Furthermore, the correlation between the vehicle-specific power and fuel consumption rate was significant. The exhaust gas recirculation (EGR) system could improve the fuel combustion efficiency and reduce vehicle emissions, particularly under high-speed and acceleration conditions.

Original languageEnglish
JournalAtmospheric Pollution Research
Publication statusAccepted/In press - 2020

Bibliographical note

Funding Information:
This study was funded by the National Key Research and Development Program of China ( 2017YFC0212100 ), the National Natural Science Foundation of China ( 21477057 ), National Engineering Laboratory, China for Mobile Source Emission Control Technology ( NELMS2019A09 ) and the International Clean Energy Talent Program 2017 of the China Scholarship Council ( 201702660024 ).

Publisher Copyright:
© 2020 Turkish National Committee for Air Pollution Research and Control

Copyright 2020 Elsevier B.V., All rights reserved.


  • Correlation analysis
  • Driving conditions
  • Fuel consumption rate
  • Fuel-CO conversion rate
  • Vehicle emission

ASJC Scopus subject areas

  • Waste Management and Disposal
  • Pollution
  • Atmospheric Science


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