Table I.

Specified control scenarios for efficiency-equality tradeoff analysis.

Scenario	Retrofit definition
A	50% of buses on each route
B	Starting from the longest routes (higher emissions), going down
C	Starting from the shortest routes (lower emissions), going up
D	Starting from the highest intake fractions (highest population exposure per unit emissions), going down
E	Starting from the lowest intake fractions (lowest population exposure per unit emissions), going up
F	Starting from the highest emissions per bus per day, going down
G	Starting from the lowest emissions per bus per day, going up
H	Starting from the highest population-weighted and concentration-weighted mortality rates in tracts intersected by road segments, going down
I	Starting from the lowest population-weighted and concentration-weighted mortality rates in tracts intersected by road segments, going up
J	Starting from the highest age-adjusted population-weighted and concentration-weighted mortality rates in tracts intersected by road segments, going down
K	Starting from the lowest age-adjusted population-weighted and concentration-weighted mortality rates in tracts intersected by road segments, going up
L	Starting from the highest health benefits per bus, going down
M	Starting from the lowest health benefits per bus, going up
N-R	Random control scenarios (routes chosen at random)