IMPACT OF CALIFORNIA REFORMULATED GASOLINE ON MOTOR VEHICLE EMISSIONS. 1. MASS EMISSION RATES

This paper addresses the impact of California phase 2 reformulate gasoline (RFG) on motor vehicle emissions. Phase 2 RFG was introduced in the San Francisco Bay Area in the first half of 1996, resulting in large changes to gasoline composition. Oxygen content increased from 0.2 to 2.0 wt percentage; and alkene, aromatic, benzene, and sulfur contents decreased. Light-duty vehicle emission rates were measured in a Bay Area roadway tunnel in summers 1994-1997. Vehicle speeds and driving conditions inside the tunnel were similar each year. The average model year of the vehicle fleet was about one year newer each successive summer. The RFG effect on vehicle emissions of benzene was estimated to be a 30-40 percent reduction. Use of RFG increased formaldehyde emissions by about 10 percent, while acetaldehyde emissions did not change significantly. RFG effects on evaporative emissions are also important. The combined effect of phases 1 and 2 of California's RFG program was a 20 percent reduction in gasoline vapor pressure, about one-fifth of which occurred following the introduction of phase 2 RFG.

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    American Chemical Society

    1155 16th Street, NW
    Washington, DC  United States  20036
  • Authors:
    • Kirchstetter, T W
    • Singer, B C
    • HARLEY, R A
    • KENDALL, G R
    • Traverse, M
  • Publication Date: 1999-1-15

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  • English

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  • Accession Number: 00762399
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 30 1999 12:00AM