SAN DIEGO COUNTY AIR POLLUTION CONTROL DISTRICT

RULE 260.3 - ABBREVIATIONS

The abbreviations used in this regulation have the following meanings:

ASTM - American Society for Testing and Materials
Btu - British thermal unit
oC - degree Celsius (centigrade)
cal - calorie
CdS - cadmium sulfide
cfm - cubic feet per minute
CO - carbon monoxide
CO2 - carbon dioxide
dscm - dry cubic meter(s) at standard conditions
dscf - dry cubic feet at standard conditions
eq - equivalents
oF - degree Fahrenheit
g - gram(s)
gal - gallon(s)
g-eq - gram equivalents
gr - grain(s)
hr - hour(s)
HC1 - hydrochloric acid
Hg - mercury
H2O - water
H2S - hydrogen sulfide
H2SO4 - sulfuric acid
in - inch(s)
oK - degree Kelvin
k - 1,000
kg - kilogram(s)
l - liter(s)
lpm - liter(s) per minute
lb - pound(s)
m - meter(s)
meq - milliequivalent(s)
min - minute(s)
mg - milligram(s)
ml - milliters(s)
mm - millimeter(s)
mol. wt. - molecular weight
mV - millivolt
N2 - nitrogen
nm - nanometer(s) - 10-9 meter
NO - nitric oxide
NO2 - nitrogen dioxide
NOx - nitrogen oxides
O2 - oxygen
ppb - parts per billion
ppm - parts per million
psia - pounds per square inch absolute
oR - degree Rankine
std - at standard conditions
sec - second
SO2 - sulfur dioxide
SO3 - sulfur trioxide
µg3 - microgram(s) - 10-6 gram