A Method for Measuring Particle Number Emissions from Vehicles Driving on the Road

Ji Shi, Roy Harrison, Douglas Evans, Aftab Khan, C Barnes, G Carter

    Research output: Contribution to journalArticle

    15 Citations (Scopus)


    Earlier research has demonstrated that the conditions of dilution of engine exhaust gases profoundly influence the size distribution and total number of particles emitted. Since real world dilution conditions are variable and therefore difficult to simulate, this research has sought to develop and validate a method for measuring particle number emissions from vehicles driving past on a road. This has been achieved successfully using carbon dioxide as a tracer of exhaust gas dilution. By subsequent adjustment of data to a constant dilution factor, it is possible to compare emissions from different vehicles using different technologies and fuels based upon real world emission data. Whilst further optimisation of the technique, especially in terms of matching the instrument response times is desirable, the measurements offer useful insights into emissions from gasoline and diesel vehicles, and the substantial proportion of particles emitted in the 3-7 nanometre size range.
    Original languageEnglish
    Pages (from-to)1-14
    Number of pages14
    JournalEnvironmental Technology
    Publication statusPublished - 1 Jan 2002


    • vehicle particle emission
    • emission rate
    • atmospheric dilution
    • nanoparticle


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