Speed-dependent emission of air pollutants from gasoline-powered passenger cars

Sungwoon Jung, Meehye Lee, Jongchoon Kim, Youngsook Lyu, Junhong Park

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In Korea emissions from motor vehicles are a major source of air pollution in metropolitan cities, and in Seoul a large proportion of the vehicle fleet is made up of gasoline-powered passenger cars. The carbon monoxide (CO), hydrocarbons (HC), oxides of nitrogen (NOx) and carbon dioxide (CO 2) contained in the exhaust emissions from 76 gasoline-powered passenger cars equipped with three-way catalysts has been assessed by vehicle speed, vehicle mileage and model year. The results show that CO, HC, NOx and CO CO 2 emissions remained almost unchanged at higher speeds but decreased rapidly at lower speeds. While a reduction in CO, HC and NOx emissions was noticeable in vehicles of recent manufacture and lower mileage, CO CO 2 emissions were found to be insensitive to vehicle mileage, but strongly dependent on gross vehicle weight. Lower emissions from more recent gasoline-powered vehicles arose mainly from improvements in three-way catalytic converter technology following strengthened emission regulations. The correlation between CO CO 2 emission and fuel consumption has been investigated with a view to establishing national CO CO 2 emission standards for Korea.

Original languageEnglish
Pages (from-to)1173-1181
Number of pages9
JournalEnvironmental Technology
Issue number11
Publication statusPublished - 2011 Aug


  • emission characteristics
  • fuel consumption
  • gasoline passenger cars
  • three-way catalyst
  • vehicle mileage

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology
  • Waste Management and Disposal

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