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

8 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 (CO2) 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 CO2 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 CO2 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 CO2 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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