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## 6.1.3. Airport Operations 

## 6.1.3.1. Airport Operation Emission Inventory Methods 

Typical sources and activities addressed in a criteria pollutant emissions inventory of airport operations include aircraft, APU, GSE, stationary sources, and ground access vehicle operations. In general terms, a criteria pollutant emissions inventory is computed by combining pollutant emissions factors with source activity levels; for instance, GSE emissions factors are expressed in pounds of pollutant per horsepower-hour of operation, and are applied to a given GSE’s known horsepower and operating schedule. 

Using guidance listed on Table 6-1 ( Criteria Pollutant Emissions Inventory Guidance Summary ) as a foundation, this section discusses considerations that should be made when preparing a criteria pollutant emissions inventory of airport operations, including how the source(s) activity is typically characterized as well as how applicable emissions mo del(s) such as EDMS and AEDT apply emissions factors or otherwise translate that activity into an emissions estimate. Appendix materials provide additional details on a source category basis (e.g., aircraft, APU, GSE, motor vehicles, and stationary sources). Construction emissions are addressed separately in Section 6.1.4 ( Airport Construction Emissions ). For additional information on how to populate EDMS/AEDT to compute aircraft, GSE and APU emissions, please refer to Appendices A1 ( Aircraft Emission Inventory for Criteria Pollutants ), A2 ( Auxiliary Power Units Emission Inventory for Criteria Pollutants ) and A3 ( Ground Support Equipment Emission Inventory for Criteria Pollutants ) respectively . Appendices A4 ( Ground Access Vehicle Emission Inventory for Criteria Pollutants ) and A5 ( Stationary Sources Emission Inventory for Criteria Pollutant s ) offer additional details on stationary source and ground access vehicle calculation methods. 

