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Homepage » Lesson 14 » Lesson 14.3
Because running MOBILE6 is a very complex undertaking, we don't recommend that tribes doing Level 2 or 3 EIs do it. There are several options for tribes wanting to estimate on-road emissions in their EIs.
If you are conducting a Level 3 QA/QC EI, for general assessment or research purposes, your best option is to download the NEI On-road mobile source emissions for the counties around you and take a look at it. It would be very difficult to try to figure out what proportion of those emissions actually occur on the reservations, so we don't recommend that you do it. The best way to use this information is for comparing the magnitude of emissions from other sources on your reservation to what comes from on-road mobile sources. For example if the NEI on-road mobile sources emissions of PM2.5 from the county that surrounds you is 500 tons/year, the 10 tons per year that you calculated as emitted from your reservations unpaved roads doesn't seem like very much in comparison.
If you are conducting a Level 2 QA/QC EI, to support strategic decision making and you are more concerned about your point sources, which you want to try to permit in the future, than you are about on-road mobile sources, you could use the following option:
- Get On-Road mobile emission factors from a state or local agency. Some states have full-time people who do nothing but deal with estimating on-road emissions and using MOBILE6. If you have a good relationship with the state, use their expertise. Once you identify the on-road emissions person at the state, tell them you want the composite emission factors that were calculated for the counties around your reservation. In some states it will be more difficult than in others. Some states just use the EPA estimates in the NEI for on-road emissions and don't even calculate them on their own. The only way to find out what your state or states do is to ask!
- Spend your time collecting good VMT data, which you can also use for road dust emission estimates.
- Use your VMT to do math with state emission factors to get reservation on road emissions
- Then after math is done, enter emissions into TEISS.
If you are conducting a Level 2 QA/QC EI, and on-road emissions are an important part of your air pollution picture then you could use the following option:
- Get training in MOBILE6 and run it! Maybe there are people at the state who will work with you to get training or run MOBILE6 for you.
- Spend time collecting good VMT data. VMT is often is weakest link in estimating on-road emissions. Check first with your tribe's roads department, often they report information on miles of road and VMT to the BIA to get road maintenance funds.
- Then use TEISS to import EF's and a VMT file, similar to what was done in the Case 1 exercise.
End of Lesson 14.3
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