The experiment was conducted in the Tuscarora Mountain Tunnel, a two-bore tunnel, two lanes each bore, 5325.4 feet long, carrying the Pennsylvania Turnpike (Interstate 76) east-west through Tuscarora Mountain in sough-central Pennsylvania. The tunnel is flat (grades +0.30% Towards the middle from either end) and straight. Twenty experimental runs were performed during the period May 18 to 23, 1999. All experimental periods except for the last period were one-hour in duration. The final period was dominated by light-duty (LD) vehicles and was two-hours in duration in order to collect a larger particulate sample for chemical analysis. A total of 6,888 cars, 290 medium gasoline and diesel trucks, and 2,883 large diesel trucks were observed. The fraction of class 7 and 8 heavy duty (HD) vehicles ranged from 83.0% to 9.6%. The large range in the fraction of HD vehicles enabled separation of the LD from HD emission rates. In conclusion, comparing the observed LD emission factor measured in this experiment with results from previous studies, DRI found results to be near the low end of the reported values, with the result of this study significantly less than that obtained in the 1993 Fraser and Cass (1998) experiment.
Measurements of Ammonia Emissions from on-Road Vehicles
2000
32 pages
Report
Keine Angabe
Englisch
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