NON-METHANE EXHAUST COMPOSITION IN THE SYDNEY HARBOUR TUNNEL: A FOCUS ON BENZENE AND 1,3-BUTADIENE

The concentrations of individual hydrocarbon species in the Sydney Harbour Tunnel were measured and used to estimate the average composition of emissions from moving motor vehicles in the Sydney urban area. The mean composition of non-methane hydrocarbons in the tunnel air on a weight basis was relatively constant. The mean concentrations for benzene and 1,3-butadiene were 45 and 13 ppbv, respectively, which in turn represented approximately 5.2% w/w and approximately 1.0% w/w of the total non-methane C2-C10 hydrocarbons in the tunnel air. The unit risk factor and the maximum incremental reactivity factor for 1,3-butadiene are approximately 30 times higher and 25 times higher, respectively, than the corresponding values for benzene. The concentration of benzene, however, is only about 5 times that of 1,3-butadiene. On this basis, the relative contribution to the risk associated with exposure to fresh motor vehicle emissions in Sydney would be about 6 times higher for 1,3-butadiene than for benzene. Similarly, the contribution made by 1,3-butadiene to the total hydrocarbon reactivity of the tunnel air will be about 5 times that of benzene.

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  • Corporate Authors:

    Elsevier

    The Boulevard, Langford Lane
    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • DUFFY, B L
    • NELSON, P F
  • Publication Date: 1996-8

Language

  • English

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Filing Info

  • Accession Number: 00724121
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Aug 19 1996 12:00AM