AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
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Use of a Potential Aerosol Mass Flow Reactor for the Measurement of Secondary Organic Aerosol Production from Gasoline Vehicle Emissions
YUNLIANG ZHAO, Andrew Lambe, Rawad Saleh, Georges Saliba, Allen Robinson, Carnegie Mellon University
Abstract Number: 418 Working Group: Aerosol Chemistry
Abstract Secondary organic aerosol (SOA) formation from dilute gasoline vehicle exhaust was investigated using a Potential Aerosol Mass flow reactor during chassis dynamometer testing. The test fleet consisted of 16 vehicles, including 10 vehicles equipped with gasoline direct injection engines (GDI vehicles) and 6 vehicles equipped with port fuel injection engines (PFI vehicles). These vehicles spanned a wide range of emissions standards from Tier0 to Super Ultra-Low emission vehicles. We observed less SOA production from vehicles meeting more stringent emissions standards. GDI and PFI vehicles appear to have similar SOA production. We also measured lower effective SOA yields for vehicles meeting more stringent emissions standards, but this appears due to a combination of differences in experimental conditions and uncertainties in OH exposure. The effective SOA yields would be similar under the same experimental conditions. Therefore, the tightening of emissions standards effectively reduces SOA production from gasoline vehicle exhaust.