Document Detail


Effects of fuel type, driving cycle, and emission status on in-use vehicle exhaust reactivity.
MedLine Citation:
PMID:  9706039     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The introduction of reformulated gasolines significantly reduced exhaust hydrocarbon (HC) mass emissions, but few data are available concerning how these new fuels affect exhaust reactivity. Similarly, while it is well established that high-emitting vehicles contribute a significant portion of total mobile source HC mass emissions, it is also important to evaluate the exhaust reactivity from these vehicles. The objective of this study was to evaluate the relative influence on in-use vehicle exhaust reactivity of three critical factors: fuel, driving cycle, and vehicle emission status. Nineteen in-use vehicles were tested with seven randomly assigned fuel types and two driving cycles: the Federal Test Procedure (FTP) and the Unified Cycle (UC). Total exhaust reactivity was not statistically different between the FTP and UC cycles but was significantly affected by fuel type. On average, the exhaust reactivity for California Phase 2 fuel was the lowest (16% below the highest fuel type) among the seven fuels tested for cold start emissions. The average exhaust reactivity for high-emitting vehicles was significantly higher for hot stabilized (11%) and hot start (15%) emissions than for low-emitting vehicles. The exhaust reactivities for the FTP and UC cycles for light-end HCs and carbonyls were significantly different for the hot stabilized mode. There was a significant fuel effect on the mean specific reactivity (SR) for the mid-range HCs, but not for light-end HCs or carbonyls, while vehicle emission status affected the mean SR for all three HC compound classes.
Authors:
J Ho; A M Winer
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of the Air & Waste Management Association (1995)     Volume:  48     ISSN:  1096-2247     ISO Abbreviation:  J Air Waste Manag Assoc     Publication Date:  1998 Jul 
Date Detail:
Created Date:  1998-09-10     Completed Date:  1998-09-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9503111     Medline TA:  J Air Waste Manag Assoc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  592-603     Citation Subset:  IM    
Affiliation:
Mobile Source Operations Division, California Air Resources Board, El Monte, California, USA.
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MeSH Terms
Descriptor/Qualifier:
Air Pollutants / analysis*
Automobile Driving*
Fossil Fuels*
Ozone / analysis
Vehicle Emissions / analysis*
Chemical
Reg. No./Substance:
0/Air Pollutants; 0/Fossil Fuels; 0/Vehicle Emissions; 10028-15-6/Ozone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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