Appendix B. Emissions Factors and Assumptions Used in Emissions Reduction Cost-Effectiveness Calculations
| Parameter or Variable | Values or Sources |
|---|---|
| Vehicle Fleet and Activity Inputs | |
| VMT mix | EPA national average (default) |
| Mileage accrual rates | EPA national average (default) |
| Vehicle model year (registration) distribution | EPA national average (default) |
| Diesel sales fractions | EPA national average (default) |
| Soak time distribution | EPA national average (default), or All soak times >720 minutes (corresponds to 100% cold starts). |
| Starts per day distribution | EPA national average (default), or Zero starts per day (for running emissions only) |
| Region | Low altitude |
| Vehicle speeds | Varied 2.5 mph and 3-65 mph by integers, with single average speed per scenario. |
| Roadway facility (functional classes) | Arterial (allows use of specific average speeds) |
| Seasonal/Meteorological Inputs | |
| Month of evaluation | July |
| Temperatures for all pollutants |
(Representative summer temperatures only. Actual source for these values is high-ozone-day data from Boston, MA nonattainment area SIP.) |
| Absolute humidity | MOBILE6.2 default |
| Fuel Inputs | |
| ASTM Class | MOBILE6.2 default |
| Oxygenated fuels | No (MOBILE6.2 default) |
| Reformulated gasoline | No (MOBILE6.2 default) |
| Gasoline RVP | 8.7 psi (Representative summer RVP only. Actual source for this value is Philadelphia, PA nonattainment area SIP.) |
| Diesel fuel sulfur content | 15 ppm |
| State Program Inputs | |
| Inspection/Maintenance (I/M) Program | No program (MOBILE6.2 default) |
| Low Emitting Vehicle (LEV) Program | No program (MOBILE6.2 default) |
| Anti-tampering program (ATP) | No program (MOBILE6.2 default) |
| Stage II refueling controls | Not modeled (NO REFUELING command used). |
| Other Inputs | |
| Particulate matter emissions parameters | EPA national average (default) |
| All other inputs | EPA national average (default) |
