On-Road Vehicle Emissions in Beijing, China: An Experimental Study Using Portable Emission Measurement System

The advanced portable emission measurement system (PEMS) OEM-2100 was employed in an extensive on-road collection of emissions in Beijing, China. The device is capable of measuring the second-by-second fuel consumption and emissions of NOx, HC, CO, CO2, as well as PM for diesel vehicles. A total of 58 days and 4260.5 kilometers on-road tests from 2003 through 2006 were conducted on 52 vehicles with 2,149 different test conditions (named as 2,149 bags). A preliminary data analysis was conducted through a four-step data processing procedure. The driver behavior in Beijing is analyzed through the inspection of acceleration and deceleration states. Temporary and spatial emission analyses show that vehicle emissions vary strongly not only with the time of day, but also with roadway facility types. It is found that during afternoon peak hours more emissions and fuel consumption than other time periods are generated in Beijing, and emissions on freeways are normally lower than on other roadway types. Since most of the test vehicles are relatively new, no significant relationships between emission/fuel consumption and vehicle age/kilometerage have been observed. It is suggested further testing more vehicles such as older vehicles, trucks, diesel vehicles, and other fuel typed vehicles to enrich the valuable database with promising potential applications in the future. City-specific emission estimation models for Beijing reflecting its road facility and vehicle specifications are expected to be developed with the sufficient employment of similar on-road emission testing.


  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; References; Tables;
  • Pagination: 25p
  • Monograph Title: TRB 86th Annual Meeting Compendium of Papers CD-ROM

Subject/Index Terms

Filing Info

  • Accession Number: 01045039
  • Record Type: Publication
  • Report/Paper Numbers: 07-1962
  • Files: TRIS, TRB
  • Created Date: Feb 8 2007 6:40PM