Air pollutant emission factors from new and in-use motorcycles

Jiun Horng Tsai, Yih Chyun Hsu, Hung Cheng Weng, Wen Yinn Lin, Fu Tien Jeng

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)


The emissions of carbon monoxide (CO), nitrogen oxides (NO(x)) and total hydrocarbon (THC) from 7 new and 12 in-use motorcycles with or without the catalyst were evaluated by testing these vehicles on a dynamometer. Also the concentrations of volatile organic compounds (VOCs) in five driving patterns, including idle, acceleration, 30 km h-1 cruise, 50 km h-1 cruise, and deceleration, were monitored. Experimental results indicate that the emissions of CO and THC from in-use motorcycles are significantly higher than new ones, but not for NO(x), and the emissions of THC from 2-stroke motorcycles are much higher than 4-stroke ones. The emissions of VOCs from in-use motorcycles are higher than new motorcycles for all five driving patterns, and those from 2-stroke engines are higher than 4-stroke motorcycles. Emission of VOCs in the modes of deceleration and idle accounts for the most mass emitted during the test driving cycle. (C) 2000 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)4747-4754
Number of pages8
JournalAtmospheric Environment
Issue number28
Publication statusPublished - 2000

All Science Journal Classification (ASJC) codes

  • General Environmental Science
  • Atmospheric Science


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