Aviation Emissions and Air Quality Handbook  37$_{ }$ Guidance Document  Emissions  Source(s)  Description  EPA,  Documentation for  Aircraft Component of the  National Emissions Inventory  Methodology , January 2011  Aircraft  Advocates the use of EDMS combined with airport -specific  LTO data to compute aircraft emissions inventories commercial operations, retaining EDMS “default” information  (e.g., taxi times) in many respects. Also provides an alternate  methodology based on “composite” emissions factors more generalized operational data when airport -specific  information is not readily available, calling only for the of piston and jet LTOs and the segregation of these operations  between the air taxi and general aviation categories . Of note,  this methodology is not used by FAA practitioners for NEPA.  GSE/APU  For commercial aircraft operations only, the guidance applies  EDMS default parameters to estimate emissions from GSE and  APU.  EPA,  Calculating Piston- Engine Aircraft Airport  Inventories for Lead for the  2008 National Emissions  Inventory,  December 2010,  [EPA-420-B-10-044]  Aircraft  Provides a methodology to estimate lead emissions from the combustion of leaded Avgas, relying upon the level of  piston-engine LTOs, lead content of Avgas, and the level of lead retention in an engine during typical operation.  FAA & EPA,  Technical Data  Aircraft, GSE,  Outlines calculation methods to estimate emissions from GSE  to Support FAA’s Advisory  APU  and APU utilization on commercial service aircraft Circular on Reducing  provides example data parameters and Emissions from Commercial  purpose. Also identifies some considerations relate Aviation , September 29, 1995  assessing  emissions  reduction  potential  for  com aircraft, GSE and APU.  FAA,  Use of First Order  Approximation (FOA) to  Estimate Aircraft Engine  Particulate Matter (PM)  Emissions in NEPA  Documents and Clean Air Act  General Conformity  Analyses , May 2005  Aircraft  Consistent with methods outlined by the ICAO, this document  identifies how both volatile (i.e., fuel sulfate, fuel organic and  lubrication oil organic compounds) and nonvolatile (i.e., soot)  PM emissions are quantified from aircraft engines. The version 3a is currently implemented in EDMS/AEDT.  EPA, AP-42, Fifth Edition,  Compilation of Air Pollutant  Emission Factors ,  Volume I:  Stationary Point and Area  Sources  Stationary  Sources,  Construction  Activities  Emission  factor  source  and  methodological  gui combustion and non-combustion stationary source emissions handled by EDMS/AEDT. Also serves as a guide to compute  non-exhaust emissions from construction activities such land disturbance, demolition, travel on unpaved materials handling and other activities undertaken during the  construction period.  Jagielski, Kurt D., and Robert  J. O'Brien,  Calculation  Methods for Criteria Air  Pollutant Emission  Inventories , July 1994  Stationary  Sources  Provides equivalent/alternative methods and data to AP-42 for  the computation of emissions from select stationary including generators, engine testing and coating operations. 