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List of Terms and Abbreviations

AGA American Gas Association

AP-42EPA document on emission factors

atm1 atmosphere = 14.7 psi

EMFACARB model for determining vehicle g/mi emissions

APIAmerican Petroleum Institute

ARB California Air Resources Board

bblbarrel of crude oil (42 gal)

BcfBillion standard cubic feet

bhp-hrbrake horsepower hour (dynamometer measurement)

BtuBritish thermal unit

bsfcbrake specific fuel consumption

CACalifornia

CEC California Energy Commission

CESCategory Emission Source

CHPCalifornia Highway Patrol

CNG compressed natural gas

CH4methane

COcarbon monoxide

CO2Carbon dioxide

DOEUnited States Department of Energy

DWT dead weight ton

EMAEngine Manufacturers Association

EMFACARB vehicle emissions factor model

EVselectric vehicles

FCCfluid catalytic cracker

FFVflexible fuel vehicle

GWhGigaWatt hour

GRIGas Research Institute

GVWgross vehicle weight

HHVhigher heating value of fuel or feedstock

hp-hrshaft horsepower hour

IGTInstitute for Gas Technology

kgkilogram

kWhkilo-Watt hour

LACMTALos Angles County Metropolitan Transportation Authority

LADWPLos Angeles Department of Water and Power

LHVlower heating value, HHV less heat of vaporization of water vapor in combustion products

LPG liquified petroleum gas

H2 hydrogen

g   grams

gal gallon

g/bhp-hr grams per brake horsepower-hour

MWhMegaWatt hour

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