Guidance Document  Emissions  Source(s)  Description  EPA,  Using MOVES to  Prepare Emission Inventories  in State Implementation Plans  and Transportation  Conformity: Technical  Guidance for MOVES2010,  2010a and 2010b , April 2012,  [EPA-420-B-12-028]  Ground Access  Vehicles  Guides a user through the technical aspects of devel oping,  modifying and/or using  county-level or larger  series of MOVES  inputs  for  emissions  calculations,  inspection/maintenance programs, fuel supply and formulation,  and vehicle age distributions.  EPA,  Transportation  Conformity Guidance for  Quantitative Hot-spot  Analyses in PM$_{2.5 }$and PM$_{10 }$ Nonattainment and  Maintenance Areas ,  November 2013, [EPA-420- B-13-053]  Ground Access  Vehicles  Guides a user through the  project-level components of an emissions analysis of PM 10  and/or PM$_{2.5}$, such as defining roadway links, link activity, and how to assess and meteorological data for developing emissions rates. guidance also forms the basis of roadway intersection analyses  discussed in  Section 7.2  ( Roadway Dispersion Modeling ).  EPA,  Using MOVES in  Project-Level Carbon  Monoxide Analyses ,  December 2010, [EPA-420- B-10-041]  Ground Access  Vehicles  Guides a user through the  project-level components of an emissions analysis of CO, such as defining roadway links, link  activity, and how to assess and utilize meteorological data for  developing emissions rates. This guidance also forms the basis  of roadway intersection analyses discussed in  Section 7.2  ( Roadway Dispersion Modeling ).  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.  38$_{ }$ 6.1.3.  Airport Operations  6.1.3.1.  Airport Operation Emission Inventory Methods  Aviation Emissions and Air Quality Handbook 