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Where: 

D = density of deicing fluid, expressed in pounds per gallon. 

D$_{w }$= density of water, expressed as 8.345 pounds per gallon. 

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C = concentration of component in deicing fluid (i.e., water, ethylene glycol, propylene glycol, urea, polymer additives, etc.), expressed as a percent. 

SG = specific gravity of component in deicing fluid; specific gravity is a dimensionless ratio of the weight of the chemical to the weight of water. 

Specific gravity for common deicing fluid components is given in Table A5-8 ( Specific Gravity of Common Deicing Fluid Components ). 

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Source: CRC Handbook of Chemistry and Physics. 

Concentration of chemical in deicing fluid (by weight) should be obtained from MSDS sheets, deicing contractor, or fluid manufacturer. Common solutions are 50 percent propylene glycol in water or 50 percent ethylene glycol in water. In many cases, different chemical formulations are used for runway and aircraft deicing. 

## A5.3.4.2 Emission Factors 

Emission factors for an ethylene glycol solution applied to a runway and to aircraft have been calculated. An emission factor of 0.0067 pounds VOC emissions per pound of ethylene glycol and propylene glycol applied should be used for runway and taxiway surface deicing, and an emission factor of 0.00011 pounds VOC emissions per pound of ethylene glycol and propylene glycol applied should be used for aircraft deicing. 33 One should be careful to note that emissions are given per pound of ethylene glycol rather than per pound of deicing fluid, which contains water. Equation A5-13 ( Density of Deicing Fluid ) takes this into account by employing a concentration factor. The emission factors given for ethylene glycol solutions may also be 

