Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 593, Issue -, Pages 462-469Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2017.03.088
Keywords
Diesel vehicles; Primary organic aerosols; Secondary organic aerosols; Black carbon; Particle number; Chamber simulation
Categories
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB05010200]
- National Key Research and Development Program [2016YFC0202204]
- National Natural Science Foundation of China [41571130031/41530641]
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In China diesel vehicles dominate the primary emission of particulate matters from on-road vehicles, and they might also contribute substantially to the formation of secondary organic aerosols (SOA). In this study tailpipe exhaust of three typical in-use diesel vehicles under warm idling conditions was introduced directly into an indoor smog chamber with a 30 m(3) Teflon reactor to characterize primary emissions and SOA formation during photo-oxidation. The emission factors of primary organic aerosol (POA) and black carbon (BC) for the three types of Chinese diesel vehicles ranged 0.18-0.91 and 0.15-0.51 g kg-fuel(-1), respectively; and the SOA production factors ranged 0.50-1.8 g kg-fuel(-1) and SOA/POA ratios ranged 0.7-3.7 with an average of 2.2. The fuel-based POA emission factors and SOA production factors from this study for idling diesel vehicle exhaust were 1-3 orders of magnitude higher than those reported in previous studies for idling gasoline vehicle exhaust. The emission factors for total particle numbers were 0.65-4.0 x 10(15) particles kg-fuel(-1), and particles with diameters less than 50 nm dominated in total particle numbers. Traditional C-2-C-12 precursor non-methane hydrocarbons (NMHCs) could only explain less than 3% of the SOA formed during aging and contribution from other precursors including intermediate volatile organic compounds (IVOC) needs further investigation. (C) 2017 Elsevier B.V. All rights reserved.
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