IMPACT OF METHANOL VEHICLES ON OZONE AIR QUALITY

A single-cell trajectory model with an updated chemical mechanism has been used to evaluate the impact on ozone air quality of methanol fueled vehicle (MFV) substitution for conventional fueled vehicles (CFV) in 20 urban areas in the US. Recent measurement data for non-methane organic compound (NMOC) concentrations and NMOC/oxides of nitrogen ratios for each of the areas was used. The sensitivity of peak 1-h ozone values to variations in many of the input parameters has been tested. The functional dependence of peak 1-h ozone on NMOC/NO-x ratios shows that, for many cities, the maximum ozone levels occur near the median urban-center 6-9 am NMOC/NO-x ratios. The results of the photochemical model computations, including several methanol-fuel substitution scenarios, have been used to derive relative reactivities of methanol and formaldehyde. Per-vehicle ozone reduction potentials for MFV have also been derived. The reduction potentials and calculated percentage ozone reductions for selected MFV market-penetrations have been used to estimate the impact of any MFV market-penetration or change in MFV emission factors. All substitution scenarios evaluated lead to projections of lower peak 1-h ozone levels. Even with significant replacement of CFV by MFV, the reduction of urban ozone levels appears to be modest. However, the reductions may be significant in comparison to other available ozone-reduction options.(A)

  • Availability:
  • Corporate Authors:

    Pergamon Press, Incorporated

    Headington Hill Hall
    Oxford OX30BW,    
  • Authors:
    • Chang, T Y
    • RUDY, S J
    • Kuntasal, G
    • GORSE, R A
  • Publication Date: 1989

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00606473
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1991 12:00AM