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Idle emissions from heavy-duty diesel and natural gas vehicles at high altitude.

Content Provider	Scilit
Author	McCormick, Robert L. Graboski, Michael S. Alleman, Teresa L. Yanowitz, Janet
Copyright Year	2000
Description	Idle emissions of total hydrocarbon (THC), CO, $NO_{x}$, and particulate matter (PM) were measured from 24 heavy-duty diesel-fueled (12 trucks and 12 buses) and 4 heavy-duty compressed natural gas (CNG)-fueled vehicles. The volatile organic fraction (VOF) of PM and aldehyde emissions were also measured for many of the diesel vehicles. Experiments were conducted at 1609 m above sea level using a full exhaust flow dilution tunnel method identical to that used for heavy-duty engine Federal Test Procedure (FTP) testing. Diesel trucks averaged 0.170 g/min THC, 1.183 g/min CO, 1.416 g/min $NO_{x}$, and 0.030 g/min PM. Diesel buses averaged 0.137 g/min THC, 1.326 g/min CO, 2.015 g/min $NO_{x}$, and 0.048 g/min PM. Results are compared to idle emission factors from the MOBILE5 and PART5 inventory models. The models significantly (45-75%) overestimate emissions of THC and CO in comparison with results measured from the fleet of vehicles examined in this study. Measured $NO_{x}$ emissions were significantly higher (30-100%) than model predictions. For the pre-1999 (pre-consent decree) truck engines examined in this study, idle $NO_{x}$ emissions increased with Health and Environment; June 30, 1999 (available from the authors).
Related Links	http://www.tandfonline.com/doi/pdf/10.1080/10473289.2000.10464229?needAccess=true
Ending Page	1998
Page Count	7
Starting Page	1992
ISSN	10962247
e-ISSN	21622906
DOI	10.1080/10473289.2000.10464229
Journal	Journal of the Air & Waste Management Association
Issue Number	11
Volume Number	50
Language	English
Publisher	Informa UK Limited
Publisher Date	2000-11-01
Access Restriction	Open
Subject Keyword	Environmental Sciences Trucks Fraction Idle Emissions G/min Pm
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science Pollution Waste Management and Disposal Management, Monitoring, Policy and Law

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