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Homepage » Lesson 15 » Lesson 15.3
With EPA's Office of Air Quality Planning and Standards (OAQPS) help, ITEP developed a table of emission factors, based on the NONROAD model results. (link) NONROAD Emission Factor table. Using these emission factors you can do the calculation on paper or in an Excel spreadsheet and enter results into TEISS.
The option that we recommend is to create user-defined calculators for each non-road mobile source that you want to calculate on the reservation. By doing this, you will be able to enter your activity data into the calculator, it will do the math, then import the emission results into your TEISS project outline.
No matter how you decide to do the math, first you'll have some data to collect:
- Vehicle Types present on the reservation* and for each type:
- Population operating on reservation*
- Average horsepower
- Average hours each vehicle operates per year
The * indicates the minimum information you'll need to collect. If you can estimate annual hours of activity (the total number of hours per year that all ATVs for example, operate on the reservation), you will get more accurate emissions estimates.
Get emission factors from the spreadsheet for each vehicle type of interest. Then you do the following calculation:
If you have just population data use this one:
EF population x population = annual emissions
A survey finds there are 1,000 2-stroke off-Road motorcycles on your reservation. You don't know how many hours/year each operates.
| Pollutant |
EF in tons/Year/vehicle |
Vehicles |
Annual emissions |
| SO2 |
0.000070 |
1,000 |
0.070 tons |
| PM |
0.004086 |
1,000 |
4.086 tons |
| THC |
0.104875 |
1,000 |
104.875 tons |
| NOx |
0.00265 |
1,000 |
2.65 tons |
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If you have hours of activity use this one:
EF activity x hours = annual emissions
A survey finds there are 1,000 2-stroke off-Road motorcycles on your reservation. You estimate that each operates 104 hours a year x 1,000 vehicles = 104,000 hours.
| Pollutant |
EF in tons/Year/vehicle |
Hours of activity |
Annual emissions |
| SO2 |
Very small |
104,000 |
Very small |
| PM |
0.000003 |
104,000 |
0.312 tons |
| THC |
0.000066 |
104,000 |
6.86 tons |
| NOx |
0.000000017 |
104,000 |
0.002 tons |
By comparing these emissions values to those shown in the population only activity data example, you can see that by using hours of activity the estimated emissions are much lower.
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End of Lesson 15.3
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