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) |