On-Road Trends Emission Inventory

Modeling Input Parameters Explorer Dashboard

Variable	Unit	Definition
$EF_{AUTO, P}$	(grams/mile)	Speed-based running exhaust emission factor for affected roadway before implementation (NOx, VOC, PM, or CO) during peak hours
$EF_{AUTO, OP}$	(grams/mile)	Speed-based running exhaust emission factor for affected roadway before implementation (NOx, VOC, PM, or CO) during off-peak hours
$EF_{BUS, P, A}$	(grams/mile)	Speed-based running exhaust emission factor for transit vehicle (NOx, VOC, PM, or CO) during peak hours – after
$EF_{BUS, P, B}$	(grams/mile)	Speed-based running exhaust emission factor for transit vehicle (NOx, VOC, PM, or CO) during peak hours – before (Applicable only for transit replacement)
$EF_{BUS, OP, A}$	(grams/mile)	Speed-based running exhaust emission factor for transit vehicle (NOx, VOC, PM, or CO) during off-peak hours – after
$EF_{BUS, OP, B}$	(grams/mile)	Speed-based running exhaust emission factor for transit vehicle (NOx, VOC, PM, or CO) during off-peak hours – before (Applicable only for transit replacement)
$TEF_{AUTO}$	(grams/trip)	Auto trip-end emission factor (NOx, VOC, PM, or CO)
$TEF_{BUS, A}$	(grams/trip)	Bus (or other transit vehicle) trip-end emission factor (NOx, VOC, PM, or CO) – after
$TEF_{BUS, B}$	(grams/trip)	Bus (or other transit vehicle) trip-end emission factor (NOx, VOC, PM, or CO) – before (Applicable only for transit replacement)
$VMT_{BUS, P, A}$		VMT by transit vehicle during peak hours – after
$VMT_{BUS, P, B}$		VMT by transit vehicle during peak hours – before (Applicable only for transit replacement)
$VMT_{BUS, OP, A}$		VMT by transit vehicle during off-peak hours
$VMT_{BUS, OP, B}$		VMT by transit vehicle during off-peak hours – before (Applicable only for transit replacement)
$VMT_{R, P}$		Reduction in automobile VMT during peak hours
$VMT_{R, OP}$		Reduction in automobile VMT during off-peak hours
$VT_{BUS, A}$	(trips)	Vehicle trips by bus or other transit vehicle – after
$VT_{BUS, B}$	(trips)	Vehicle trips by bus or other transit vehicle – before
$VT_{R, P}$	(trips)	Reduction in number of automobile vehicle trips during peak hours
$VT_{R, OP}$	(trips)	Reduction in number of daily automobile vehicle trips during off-peak hours