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LIST OF ABBREVIATIONS
PARAMETERS
AMB T Ambient (room) temperature
CO Carbon monoxide (a toxic gas)
CO2 Carbon dioxide
COMBUST Combustible gases
EFFIC Combustion efficiency (for boilers and furnaces, does not
apply to engines)
EX AIR Excess air
NO Nitric oxide (a toxic gas)
NO2 Nitrogen dioxide (a toxic gas)
NOX Oxides of nitrogen (a toxic mixture of nitric oxide and
nitrogen dioxide gases)
OXYGEN REF Oxygen reference basis for correction of toxic gas
Concentration
SO2 Sulfur dioxide (a toxic gas)
STACK T Stack temperature
THERMAL EFF Engine thermal efficiency (heat loss method of
calculation, not the same as combustion efficiency)
UNITS
PPM Parts (of pollutant) per million (volume basis-dry)
MGM Milligrams (of pollutant) per cubic meter
GBH Grams (of pollutant) per (engine) brake horsepower-hour
#/B Lbs. (of pollutant) per million BTU (of fuel)
" Inches of water (draft measurement)
%
Percent by volume dry basis
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