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

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

OCE Informal Document No. 24 Ninth Plenary Meeting of the Working Group On Off-Cycle Emissions 11&12 January 2005 Palais des Nations, Geneva

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

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

• 40
• 30
• 20
• 10

10 20 30 40 50 Ambient Air Temperature (C) Cummulative Percent U.S. Heavy-duty Diesel Vehicle Miles Traveled 0.0% 0.5% 1.0% 1.5% 2.0% 2.5% Incremental Percent Highway HD Diesel VMT Cummulative HD VMT Incremental HD VMT

Typical ozone formation temperatures (>32C), less than 3% HD VMT

Estimated U.S. Highway Heavy-duty Diesel Vehicle Miles Traveled (VMT) versus Altitude

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

• 500

1,000 1,500 2,000 2,500 Altitude (meters) Cummulative Percent U.S. Heavy-duty Diesel Vehicle Miles Traveled 0% 5% 10% 15% 20% 25% Incremental Percent Highway HD Diesel VMT Cummulative Altitude HD VMT Incremental Altitude HD VMT

Maximum altitude limit containted in draft GTR = 1676 meters