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초록· 키워드

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Information from the literature and from on-going test programs (government and industry) was ana lyzed with regard to the effect of gasoline Reid vapor pressure (RVP) on total vehicle hydrocarbon (BC) emissions, including evaporative, refueling, and exhaust emissions. A reduction in the aver age RVP of summer gasolines from present commer cial levels to 9 psi was estimated to decrease total vehicle hydrocarbon emissions by 9-25 per cent. With such reductions, hydrocarbon emission inventories for three major cities (Detroit, New York, and Dallas) would be decreased by 3-7 per cent and, consequently, local ambient ozone levels would be reduced as much as 9 ppb. Ac cordingly , in many areas of the country, RVP reduction could make an important contribution toward achievement of the National Ambient Air Quality Standard (NAAQS) of 120 ppb ozone.
Gasoline vapor pressure reduction to 9 RVP would provide slightly greater control of total vehicle HC emissions than would service station (Stage II) or on-board control of refueling emis sions. More importantly, RVP control would pro vide immediate emissions reductions for the en tire vehicle population (rather than a gradual phase-in of that benefit tied either to new vehicle sales and scrapping of old cars or to installation of Stage II equipment). Although low RVP gasoline might cost about 1 percent more than present summer gasoline, RVP control would be competitive with on-board or Stage II control on a cost-effectiveness basis.
New data confirm that cold driveability at intermediate temperatures would not be impaired by control of summer-gasoline RVP to 9 psi.

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UCI(KEPA) : I410-ECN-0101-2009-556-014124569