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Technical Paper

RVP Reduction for Control of Wintertime CO

1998-05-04
981373
A vehicle emissions test program was conducted to evaluate the impact of gasoline RVP reduction on CO emissions under conditions that are typical of CO exceedance days in Las Vegas and Los Angeles. Test results showed that CO emissions were reduced in the Las Vegas fleet when RVP was changed from 12 to 9 psi. In the Los Angeles fleet, the results were less consistent, perhaps due to the poorer integrity of evaporative emissions control systems on these vehicles. This suggests that an optimum emissions control strategy might include both RVP reduction and an effective vehicle inspection and maintenance (I&M) program.
Technical Paper

Effects of RVP Reduction on Vehicle CO Emissions During Las Vegas and Los Angeles Winter Conditions - Petroleum Environmental Research Forum Project Number 95-06

1997-05-01
971726
Two fleets of thirty vehicles each were emissions tested in order to determine the effect of gasoline RVP reduction on tailpipe carbon monoxide (CO) emissions in Las Vegas and Los Angeles under conditions typical of winter CO exceedances in these two cities. The hypothesized emission reduction was confirmed for Las Vegas. However, for Los Angeles, the effect of RVP was questionable. The reason or reasons for this discrepancy between the two cities could not be completely resolved from this study. Detrimental emissions effects of reduced RVP under cold temperatures were found to be small and inconsequential.
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