Journal
JOURNAL OF AEROSOL SCIENCE
Volume 133, Issue -, Pages 1-11Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jaerosci.2019.03.009
Keywords
Secondary organic aerosol; Environmental chamber; Inorganic aerosol; PM emissions; Gasoline direct injection vehicles
Categories
Funding
- South Coast Air Quality Management District (SCAQMD) [15625]
- National Science Foundation Award [NSF 1151893]
- U.S. Environmental Protection Agency STAR Fellowship [FP-91751101]
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Direct primary emissions from light-duty passenger in the past 50 years have been reduced significantly. However, the potential of primary emissions to oxidize downwind of sources is challenging and not well understood. This study investigates the secondary aerosol (SA) forming potential of emissions generated from four wall-guided gasoline direct injection (GDI) vehicles operating under realistic driving conditions. The exhaust for each vehicle was collected in the new University of California, Riverside, Center for Environmental Research and Technology's (CE-CERT) Mobile Atmospheric Chamber (MACh) while driven over vehicle test cycles using a chassis dynamometer and subsequently, photochemically aged. Results show that the chemical and physical properties of the aged aerosol are significantly different between the GDI vehicles and consistent within each vehicle's chamber experiment. Ageing modifies the particle composition, density, volatility, and cloud condensation nuclei (CCN) hygroscopicity. Secondary aerosol studies from controlled-laboratory dynamometer and atmospheric chamber studies will provide additional insight into the environmental impact of real-world vehicular sources.
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