40 C.F.R. § 86.078-3
The abbreviations in this section apply to this subpart and also to subparts B, D, H, I, J, N, O and P of this part and have the following meanings:
accel.-acceleration.
AECD-Auxiliary emission control device.
API-American Petroleum Institute.
ASTM-American Society for Testing and Materials.
BHP-Brake horsepower.
BSCO-Brake specific carbon monoxide.
BSHC-Brake specific hydrocarbons.
BSNOX-Brake specific oxides of nitrogen.
C-Celsius.
cfh-cubic feet per hour.
CFV-Critical flow venturi.
CFV-CVS-Critical flow venturi-constant volume sampler.
CH4 methane.
CL-Chemiluminescence.
CO2-carbon dioxide.
CO-Carbon monoxide.
conc.-concentration.
cfm-cubic feet per minute.
CT-Closed throttle.
cu. in.-cubic inch(es).
CVS-Constant volume sampler.
decel.-deceleration.
EP-End point.
evap.-evaporative.
F-Fahrenheit.
FID-Flame ionization detector.
FL-Full load.
ft.-feet.
g-gram(s).
gal.-U.S. gallon(s).
GVW-Gross vehicle weight.
GVWR-Gross vehicle weight rating.
h-hour(s).
H2O-water.
HC-hydrocarbon(s).
HFID-Heated flame ionization detector.
Hg-mercury.
hi-high.
hp.-horsepower.
IBP-Initial boiling point.
ID-Internal diameter.
in.-inch(es).
K-kelvin.
kg-kilogram(s).
km-kilometer(s).
kPa-kilopascal(s).
lb.-pound(s).
lb.-ft.-pound-feet.
m-meter(s).
max.-maximum.
mg-milligram(s).
mi.-mile(s).
min.-minute(s).
ml-milliliter(s).
mm-millimeter(s).
mph-miles per hour.
mv-millivolt(s).
N2-nitrogen.
NDIR-Nondispersive infrared.
NO-nitric oxide.
NO2-nitrogen dioxide.
N2O nitrous oxide.
NOX-oxides of nitrogen.
No.-Number.
O2-oxygen.
Pb-lead.
pct.-percent.
PDP-CVS-Positive displacement pump-constant volume sampler.
ppm-parts per million by volume.
ppm C-parts per million, carbon.
psi-pounds per square inch.
psig-pounds per square inch gauge.
PTA-Part throttle acceleration.
PTD-Part throttle deceleration.
R-Rankin.
rpm-revolutions per minute.
RVP-Reid vapor pressure.
s-second(s).
SAE-Society of Automotive Engineers.
SI-International system of units.
sp.-speed.
TEL-Tetraethyl lead.
TML-Tetramethyl lead.
UDDS-Urban dynamometer driving schedule.
V-volt(s).
vs-versus.
W-watt(s).
WF-Weighting factor.
WOT-Wide open throttle.
wt.-weight.
'-feet.
"-inch(es).
°-degree(s).
-summation.
40 C.F.R. §86.078-3