title: Speed-dependent emission of air pollutants from gasoline-powered passenger cars.
abstract: 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 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, 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 CO2 emission and fuel consumption has been investigated with a view to establishing national CO2 emission standards for Korea.
authors.affiliation: Division of Air Quality Control Research, National Institute of Environmental Research, Incheon, Republic of Korea. actual77@korea.kr
authors.forename: Sungwoon
authors.initials: S
authors.lastname: Jung
authors.forename: Meehye
authors.initials: M
authors.lastname: Lee
authors.forename: Jongchoon
authors.initials: J
authors.lastname: Kim
authors.forename: Youngsook
authors.initials: Y
authors.lastname: Lyu
authors.forename: Junhong
authors.initials: J
authors.lastname: Park
mesh_terms: D000393:Air Pollutants / Q000032:analysis / Q000737:chemistry*; D001336:Automobiles / Q000592:standards*; D002248:Carbon Monoxide / Q000032:analysis / Q000737:chemistry*; D005742:Gasoline; D006838:Hydrocarbons / Q000032:analysis / Q000737:chemistry*; D016014:Linear Models; D009038:Motion; D009589:Nitrogen Oxides / Q000032:analysis / Q000737:chemistry*; D056910:Republic of Korea; D001335:Vehicle Emissions / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D005742:Gasoline; D006838:Hydrocarbons; D009589:Nitrogen Oxides; D001335:Vehicle Emissions; D002248:Carbon Monoxide