Secondary Aerosol Formation Potential of Gasoline Vehicle Exhaust Under On-road and Laboratory Conditions

Pauli Pekka Simonen, Joni Johannes Kalliokoski, Panu Aleksi Karjalainen, Miikka Ilmari Dal Maso, Topi Santeri Rönkkö, Sanna Saarikoski, Hilkka Timonen, Matthew Bloss, Athanasios Dimaratos, Leonidas Ntziachristos, Jorma Olavi Keskinen

    Research output: Other conference contributionAbstractScientific


    Light-duty vehicles emit both primary particles and precursor gases that can form secondary particle mass as a result of atmospheric oxidation. The potential of vehicle exhaust to produce secondary mass has been studied in laboratories using large smog chambers and fast oxidation flow reactors. However, the composition of exhaust emissions in real-world driving may significantly differ from those of laboratory driving cycles.

    To probe the difference of real-world and laboratory observations, we performed measurements of the secondary mass formation potential of two modern gasoline vehicles. Real-world driving emissions were obtained by vehicle chase measurements, and they were compared to the measurements conducted on a chassis dynamometer for the same vehicles.

    The emissions were measured with two ELPIs (Electrical low pressure impactors): one measuring the primary emission and the other measuring the emission aged in TSAR (TUT Secondary Aerosol Reactor), a fast-response oxidation flow tube in which the sample is exposed to ozone and OH radicals. The chemical composition of particles before and after the oxidation flow reactor was measured by an SP-AMS; primary emission particle number concentration was measured using a CPC and a PSM-CPC combination. Gas-phase emissions were measured with CO2 and NOx analyzers. In addition, a PEMS system was deployed during the chase measurements to measure raw exhaust CO2, NOx and CO concentrations.

    In this work, we present the results of on-road secondary aerosol formation potential of light-duty gasoline vehicles, and compare the on-road and laboratory results. Especial attention is paid to chemical composition of secondary aerosol, as well as, total secondary particle formation potential in terms of mass.
    Original languageEnglish
    Publication statusPublished - 19 Oct 2016
    EventAmerican Association for Aerosol Research: 35th Annual Conference - Oregon Convention Center, Oregon, United States
    Duration: 17 Oct 201621 Oct 2016
    Conference number: 35


    ConferenceAmerican Association for Aerosol Research
    Abbreviated titleAAAR 2016
    Country/TerritoryUnited States
    Internet address


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