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HEI launches two new non-tailpipe emission studies


HEI is pleased to announce two new studies funded under RFA 21-1, Quantifying Real-World Impacts of Non-Tailpipe Particulate Matter Emissions.

Emissions from automobile exhaust systems have decreased in recent years thanks to the introduction of cleaner fuels and new control technologies on internal combustion engines, as well as increases in numbers of hybrid and electric vehicles. However, emissions from the use and wear of brakes, tires, and other non-tailpipe sources are gaining interest from researchers and regulators because non-tailpipe sources now contribute a higher fraction of the particulate emissions from motor vehicles.

These two new studies will measure mass and composition of ambient particles from non-tailpipe motor vehicle sources and assess the effects of such emissions on air quality, human exposure, and human health. Research teams will also measure concentrations of exhaust pollutants in an attempt to disentangle non-tailpipe and tailpipe pollution, to better understand how each effects human health.


The new studies are:

  • “Improved Characterization of the Real-World Contributions and Impacts of Non-tailpipe Particulate Matter Emissions,” led by Greg Evans, University of Toronto.

    • ​​​​​​​This study will measure concentrations of non-tailpipe particulate matter across Toronto, Canada to determine how much non-tailpipe pollution people might breathe in everyday life and how to better measure these exposures in the future.
  • “Assessing the Impact of Non-exhaust Emissions from Traffic on the Asthmatic Airway (IONA),” led by Chris Griffiths, Queen Mary University of London.

    • ​​​​​​​In this study, participants with mild to moderate asthma will ride stationary bicycles on sidewalks in three London, UK environments (busy road characterized by stop-and-go traffic, high speed continuous traffic, and urban background) to measure how exposure to traffic with different mixtures of non-tailpipe and tailpipe emissions affects lung function of asthmatic adults.

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