ON-ROAD AND NON-ROAD SOURCES
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Transcript of ON-ROAD AND NON-ROAD SOURCES
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ON-ROAD AND NON-ROAD SOURCES
Melinda Ronca-Battista and Angelique Luedeker,
ITEP/TAMS Center
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ON-ROAD EMISSION SOURCES
Emissions from vehicles includeExhaustBrake and tire wearEvaporation
2 main classification categoriesBy vehicle typeBy road type
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VEHICLE TYPES
Vehicle types – GasolineLight duty gasoline vehicles (LDG Vs & Ts)
Passenger cars & trucksMotorcycles (MC)Heavy duty gasoline vehicles (HDGV 2b-
8b) Modifier based on gross vehicle weight rating
(gvwr) Trucks Busses
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VEHICLE TYPES (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
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ROAD TYPES
Road types – Rural & Urban Arterials
Interstates Other major highways Minor highways
Collectors On & off ramps
Locals
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VEHICLE MILES TRAVELED (VMT)
On-Road 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!
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VMT (CONT.)
VMT exampleState Route 1 (SR1) is a 10-mile-long stretch
of rural highwayOn average, 100 cars travel road every dayTotal VMT for cars = 10 miles x 100
vehicles/day x 365 days/year =
365,000 vehicle miles/year
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EPA MOVES MODEL
Complex black box model 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
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ON-ROAD EMISSION ESTIMATION OPTIONS FOR TRIBES Option 1: Get training on MOVES and run it!
Most accurate method since emissions are then specific to the reservation Vehicle population on tribal land could be different than off tribal land
E.g.: Average vehicle age?
Option 2: Allocate (scale down) county level NEI emissions to the reservation levelEstimate VMT for on reservation roadsCalculate ratio of the reservation VMT to the county VMTMultiply county level emissions by ratio
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COUNTY VMT DATA
State department of transportation agencies can be a source of VMT data Some states have VMT data available online, for
example California Air Resources Board EMFAC database: http://www.arb.ca.gov/emfac/
ITEP has county VMT data from 2011 NEI in a spreadsheet, 2011NEICountyVMT.xlsx VMT data are summed by county and road type
Demonstration of Using Spreadsheet and TEISS Reports to Estimate On-Road Emissions
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NON-ROAD MOBILE SOURCES Any moving, motor-driven thing
Tractors Construction equipment ATVs, off-road motorcycles, non-commercial boats
Doesn’t have to be a vehicle Lawn and garden equipment Generators Irrigation pumps
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EPA NONROAD MODEL
Emissions from these vehicles usually estimated using EPA’s NONROAD model Gives results only on state or county basis
Have to modify input files to run for reservation
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NON-ROAD EMISSION ESTIMATION OPTIONS FOR TRIBES
Option 1: Learn to use the NONROAD modelMost accurate method since emissions are
then specific to the reservation
Option 2: Allocate (scale down) county level NEI emissions to the reservation levelThis allocation can be based on reservation to
county land area ratioFor some source categories, calculation of a
more relevant ratio might be possible
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NON-ROAD EXAMPLE ALLOCATIONS Recreational Marine Vessels
Allocation based on ratio of reservation lake area or shoreline distance to county lake area or shoreline distance
Lawn and Garden Equipment Allocation based on ratio of number of reservation households to number of
households in the county
Demonstration of Using Allocations and TEISS Reports to Estimate Non-Road Emissions
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HOMEWORK DUE IN 5 DAYS: Write out how you plan to estimate the
reservation on-road emissions and non-road emissions
Email the plan to the instructors