CTG

control technique guidelines

CTM

chemical transport model


3D

three-dimensional—three in space

4D

four-dimensional—three in space and one in time

DALYs

disability-adjusted life-years

DDT

dichlorodiphenyltrichloroethane

DOE

U.S. Department of Energy


ECO

employee commute options

EIIP

Emission Inventory Improvement Program

EKMA

empirical kinetic modeling approach

EPA

U.S. Environmental Protection Agency

ERC

emission-reduction credit


FACE

free air CO2 enrichment

FEM

federal equivalent methods

FHWA

U.S. Federal Highway Administration

FIA/FHM

Forest Inventory and Analysis and Forest Health Monitoring Program

FIP

federal implementation plan

FRM

federal reference methods

FTIR

Fourier transform infrared spectroscopy

FTP

federal test procedure (for vehicle emissions)


G/bhp-hr

grams per brake horsepower hour

g/gal

grams per gallon

g/kWh

grams per kilowatt hour

GACT

generally available control technology

GAO

U.S. General Accounting Office

GC

gas chromatography

GPMN

Gaseous Pollutant Monitoring Network (NPS)

GPMP

Gaseous Pollutant Monitoring Program (NPS)

GPRA

Government Performance and Results Act (1993)

GVWR

gross vehicle weight rating (weight of vehicle plus rated cargo capacity)


H2S

hydrogen sulfide

HAP

hazardous air pollutant

HC

hydrocarbons

HCl

hydrogen chloride

HDV

heavy-duty vehicle

HEI

Health Effects Institute

HOV

high-occupancy vehicle

hp

horsepower

hr

hour

HUD

U.S. Department of Housing and Urban Development


I/M

vehicle inspection and maintenance



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