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Source: EPA and FAA, Recommended Best Practice for Quantifying Speciated Organic Gas Emissions from Aircraft Equipped with Turbofan, Turbojet, and Turboprop Engines , May 27, 2009, http://www.epa.gov/otaq/regs/nonroad/aviation/420r09901.pdf. 

Unlike emissions from other transportation sources, international certification standards require that HAP emissions from newly certified aircraft engines be reported in units of methane equivalency. Thus, for HAP emissions , the methane equivalency 57 is converted to TOG according to the average molecular weight of the specific profile. The factors for converting THC to TOG, VOC to TOG and factors to/from the other groups of organic compounds (such as Non-Methane Organic Gases - NMOG and Non-Methane Hydrocarbons - NMHC) are provided in Table B-5 ( Conversion Factors ). 

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Source: EPA and FAA, Recommended Best Practice for Quantifying Speciated Organic Emissions from Aircraft Equipped with Turbofan, Turbojet, and Turboprop Engines , May 27, 2009, http://www.epa.gov/otaq/regs/nonroad/aviation/420r09901.pdf 

Note: $^{1 }$For the purpose of reporting, application, and comparison, the units for the compounds in this table are referenced as follows: THC measured as methane equivalent (following Procedures in the Emissions Certification of Aircraft Engines, Annex 16, Volume II, International Civil Aviation Organization, TOG as TOG, VOC as VOC, and NMOG as NMOG. 

This conversion from THC to TOG emissions i s shown in Equation B-3 ( Conversion to TOG Emissions ). 

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