The report evaluates tailpipe and non-tailpipe hydrocarbon (HC) emissions from light-duty spark-ignition vehicles. The sources of information were unpublished data sets, generated mainly from 1990 through 1994, on emissions from volunteer fleets of in-use vehicles, and published Chemical Mass Balance source apportionments of HC in roadway tunnels and in urban air. The objective was to extract as much existing information as possible about magnitudes of running-loss emissions, hot soak emissions, diurnal emissions, and resting loss emissions, in absolute terms and in terms relative to one another and to tailpipe emissions. Relations between pressure- and purge-test failures and actual non-tailpipe emissions were also examined.


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    Non-Tailpipe Hydrocarbon Emissions from Motor Vehicles

    Pierson, W. R. / Fujita, E. M. / Lawson, D. R. et al. | British Library Conference Proceedings | 1997


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    Fuel Effects Observed in Engine-Out and Tailpipe Speciation of Hydrocarbon Emissions

    Gorse, R. A. | British Library Conference Proceedings | 1993