Oxidative potential of gas phase combustion emissions - An underestimated and potentially harmful component of air pollution from combustion processes

S. Stevanovic, A. Vaughan, F. Hedayat, F. Salimi, M.M. Rahman, A. Zare, R.A. Brown, R.J. Brown, H. Wang, Z. Zhang, X. Wang, S.E. Bottle, I.A. Yang, Z.D. Ristovski

    Research output: Contribution to journalArticlepeer-review

    28 Citations (Scopus)

    Abstract

    The oxidative potential (OP) of the gas phase is an important and neglected aspect of environmental toxicity. Whilst prolonged exposure to particulate matter (PM) associated reactive oxygen species (ROS) have been shown to lead to negative health effects, the potential for compounds in gas phase to cause similar effects is yet to be understood.

    In this study we describe: the significance of the gas phase OP generated through vehicle emissions; discuss the origin and evolution of species contributing to measured OP; and report on the impact of gas phase OP on human lung cells. The model aerosol for this study was exhaust emitted from a Euro III Common-rail diesel engine fuelled with different blends of diesel and biodiesel. The gas phase of these emissions was found to be potentially as hazardous as the particle phase. Fuel oxygen content was found to negatively correlate with the gas phase OP, and positively correlate with particle phase OP. This signifies a complex interaction between reactive species present in gas and particle phase. Furthermore, this interaction has an overarching effect on the OP of both particle and gas phase, and therefore the toxicity of combustion emissions.
    Original languageEnglish
    Pages (from-to)227-235
    Number of pages9
    JournalAtmospheric Environment
    Early online date25 Mar 2017
    DOIs
    Publication statusPublished - Jun 2017

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