Highway Heavy-duty Diesel Operation and Ambient Conditions in the - PowerPoint PPT Presentation

OCE Informal Document No. 24 Ninth Plenary Meeting of the Working Group On Off-Cycle Emissions 11&12 January 2005 Palais des Nations, Geneva Highway Heavy-duty Diesel Operation and Ambient Conditions in the U.S. 9th Off-cycle Emissions Plenary Meeting 12 January 2005 United States Environmental Protection Agency

Presentation of U.S. Highway HD Diesel Operation Data • Data and analysis performed by a contractor to several HD engine companies in 2000 – Air Improvement Resources • Combined information from; – U.S. emissions inventory model • HD diesel vehicles vehicle miles traveled (VMT) by county for 48-states – U.S. meteorological data from airports • 260 airports with hourly temperature data, for 1995-1997 • Temperature data assigned to each county based on proximity to nearest airports (errors not quantified) – Altitude data for each airport • Altitude for airports assigned to each county based on proximity to nearest airports (errors not quantified)

Estimated U.S. Highway Heavy-duty Diesel Vehicle Miles Traveled (VMT) versus Ambient Air Temperature, 1995-1997 average 100% 2.5% Incremental Percent Highway HD Diesel VMT 90% Cummulative Percent U.S. Heavy-duty Diesel 80% 2.0% Typical ozone 70% formation Vehicle Miles Traveled temperatures 60% 1.5% (>32C), less than 3% HD 50% VMT 40% 1.0% 30% 20% 0.5% 10% 0% 0.0% -40 -30 -20 -10 0 10 20 30 40 50 Ambient Air Temperature (C) Cummulative HD VMT Incremental HD VMT

Estimated U.S. Highway Heavy-duty Diesel Vehicle Miles Traveled (VMT) versus Altitude 100% 25% 90% Cummulative Percent U.S. Heavy-duty Diesel 80% 20% Incremental Percent Highway HD Diesel VMT 70% Vehicle Miles Traveled Maximum altitude limit 60% 15% containted in draft GTR = 1676 meters 50% 40% 10% 30% 20% 5% 10% 0% 0% - 500 1,000 1,500 2,000 2,500 Altitude (meters) Cummulative Altitude HD VMT Incremental Altitude HD VMT