


                          UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
                            National Vehicle and Fuel Emissions Laboratory 2000 Traverwood Drive
                                 Ann Arbor, Michigan 48105-2498


July 21, 2016

MEMORANDUM

             SUBJECT:	Pie Chart of the 2014 GHG Emissions from U.S. Transportation Sources

             FROM:	Bryan J. Manning, Mechanical Engineer Assessment and Standards Division
             Office of Transportation and Air Quality
             U.S. Environmental Protection Agency

TO:	The Air and Radiation Docket
             Docket No. EPA-HQ-OAR-2014-0828

This memorandum documents how the greenhouse gas (GHG) emissions from United States (U.S.) transportation sources (or categories) are inventoried.  This includes comparisons of the following: (1) the individual categories for U.S. transportation GHG emissions as a share of total U.S. transportation GHG emissions and (2) the separate categories for U.S. aircraft GHG emissions as a share of total U.S. aircraft GHG emissions.  Refer to the attachment for this memorandum for a description of these comparisons.  The reference for the above GHG emissions inventories and comparisons is the 2016 Environmental Protection Agency (EPA) report entitled, Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2014.  








Attachments: 
 Calculations for Pie Chart of the 2014 GHG Emissions from U.S. Transportation Sources (Excel file)



