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Nonroad Emissions Estimation for Tribal Reservations: A How-To Guide

Learn how to estimate emissions from nonroad sources such as trains, tractors, construction equipment, and more for tribal reservations using EPA's NONROAD model and emission factors provided by ITEP. Gather vehicle types, population data, and average hours of operation to calculate annual emissions.

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Nonroad Emissions Estimation for Tribal Reservations: A How-To Guide

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  1. NonroadSources Melinda Ronca-Battista, ITEP

  2. NonroadMobile Sources • Any moving, motor-driven thing • Trains • Tractors • Construction equipment • ATVs, off-road motorcycles, boats • Doesn’t have to be a vehicle • Lawn and garden equipment • Generators • Irrigation pumps

  3. NonroadMobile Sources • 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

  4. NONROAD MOBILE SOURCES (CONT.) • ITEP worked with several tribes and EPA’s OAQPS to find best way for tribes to estimate emissions from non-road sources • Developed table of emission factors, based on NONROAD model results • Can do calculation on paper or in spreadsheet, then enter results into TEISS

  5. What data do you need to collect? • Vehicle Types* • Population operating on reservation* • Average horsepower • Average hours each vehicle operates per year *Minimum information you must collect

  6. How to do the calculations? • Can you estimate annual hours of activity? • Get emission factors from ITEP for each vehicle type of interest EFpopulation x population = annual emissions OR EFactivity x hours = annual emissions Hours of activity gives a better estimate!

  7. NONROAD EXAMPLE 1 Survey finds 1,000 2-stroke, off-road motorcycles on your reservation. No info on how many hours per year each operates

  8. NONROAD EXAMPLE 2 Survey finds 1,000 2-stroke off-road motorcycles on your reservation. Each operates 104 hours per year x 1,000 vehicles = 104,000 hours

  9. NonroadHands-On • Nonroad calculation exercise handout

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