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On r oad Sources

On r oad Sources. Angelique Luedeker, ITEP. Onroad Emissions. Emissions from vehicles Exhaust Brake and tire wear Evaporation. Onroad Emissions (cont.). 2 main categories By vehicle type By road type. Onroad Emissions (cont.). Vehicle types – Gasoline

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On r oad Sources

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  1. OnroadSources Angelique Luedeker, ITEP

  2. OnroadEmissions • Emissions from vehicles • Exhaust • Brake and tire wear • Evaporation

  3. Onroad Emissions (cont.) • 2 main categories • By vehicle type • By road type

  4. Onroad Emissions (cont.) • Vehicle types – Gasoline • Light duty gasoline vehicles (LDG Vs & Ts) • Passenger cars & trucks • Motorcycles (MC) • Heavy duty gasoline vehicles (HDGV 2b-8b) • Modifier based on gross vehicle weight rating (gvwr) • Trucks • Busses

  5. Onroad Emissions (cont.) • Vehicle types – Diesel • Light duty diesel vehicles (LDDV - cars) • Light duty diesel trucks (LDDT < 8500 lb gvwr) • Heavy duty diesel trucks (HDDV 8500 to >60K lb gvwr) • School & public transportation busses

  6. Emission Factors (cont.) • Road types – rural & urban • Arterials • Interstates • Other major highways • Minor highways • Collectors • On & off ramps • Locals

  7. Emission Factors (cont.) • Emission Factors (EFs): MOVES • EPA model – (complex black box) • Factors in emission modeling • Climate (Seasonal temp, humidity, elevation) • Type of road (braking & accelerating estimates) • Registration records (how old are the cars) • Fuel type (sulfur content, vapor pressure, MTBE) • Other

  8. Emission Factors (cont.) • Emissions based on total vehicle miles traveled (VMT) per road type per year ** Emission estimates for paved and non-paved road dust also rely on VMT calculations!

  9. Emission Factors (cont.) • VMT example • State Route 1 is a 10-mile-long stretch of rural highway • On average, 100 cars travel road every day • Total VMT = 10 miles x 100 vehicles/day x 365 days/year = 365,000 vehicle miles/year

  10. Emission Factors (cont.) • Emissions based on this estimate of VMT for cars on SR1 • Carbon monoxide (CO) EF for cars on rural highways = 24.523 g/VMT (for this example) • Emissions estimate = • 24.523 g/VMT x 365,000 VMT = 8,950,895 g of CO • 8,950,895 g / 907184.74(g/ton) = 9.867 tons per year CO

  11. Emission Factors (cont.) • Emission Factors • As detailed as you want • Based on vehicle type and road type

  12. Emission Factors (cont.) • Option 1 for tribes • Get on-road mobile emission factors from state agencies • Difficult, many just use EPA estimates • Spend your time collecting good VMT • Use your VMT to do math with state emission factors to get reservation on road emissions • After math is done, enter into TEISS

  13. Emission Factors (cont.) • Option 2 for tribes • Vehicle population on tribal land different than off tribal land • E.g.: Average vehicle age? • Get training in MOVES and run it! • Then use TEISS to import EFs

  14. Emission Factors (cont.) • With introduction of MOVES model, method for calculating on-road mobile emissions has changed • Contact ITEP when you’re ready to estimate on-road emissions. We’ll find assistance you need to get started

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