                                       
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY                NATIONAL VEHICLE AND FUEL EMISSIONS LABORATORY
                              2565 PLYMOUTH ROAD
                        ANN ARBOR, MICHIGAN 48105-2498
                                       

                                   OFFICE OF
                               AIR AND RADIATION
                                                                                               	     
                                       

MEMORANDUM

                              
SUBJECT:	Air Quality Modeling Outputs for the Proposed Tier 3 Motor Vehicle Emission and Fuel Standards
		
FROM:	Margaret Zawacki
		Assessment and Standards Division
		Office of Transportation and Air Quality

TO:		Docket EPA-HQ-OAR-2011-0135-DRAFT-####

DATE:		March 22, 2013



The purpose of this memorandum is to transmit data files which were used in the air quality modeling analyses for the proposed Tier 3 Motor Vehicle Emission and Fuel Standards.  The air quality modeling analyses are discussed in Section III.C of the preamble, Section 7.2.2  -  Section 7.2.4 of the Regulatory Impact Analysis (RIA) and in the Air Quality Modeling Technical Support Document.  Information on the air quality modeling inventories is discussed in Section 7.2.1 of the RIA.  

Following is a list of the information contained on the enclosed disc:

- deposition DBF files folder: gridded annual nitrogen and sulfur deposition difference data for 2017 and 2030 reference cases and Tier 3 control scenarios

- toxics DBF files folder:  gridded annual and seasonal (winter/summer) toxics difference data for 2017 and 2030 reference cases and Tier 3 control scenarios

- TIER3_Proposal_Ozone_DVs.xlsx:  county-level 8-hour max ozone Design Value projections for 2017 and 2030 reference cases and Tier 3 control scenarios

- TIER3_Propsoal_annualPM_DVs.xlsx:  county-level annual PM2.5 Design Value projections for 2017 and 2030 reference cases and Tier 3 control scenarios

- TIER3_Proposal_dailyPM_dvs.xlsx:  county-level 24-hour PM2.5 Design Value projections for 2017 and 2030 reference cases and Tier 3 control scenarios

- TIER3_Proposal_Visibility.xlsx:  Class 1 Area visibility projections for the 20% worst days for 2005 reference case, 2030 reference case and Tier 3 control scenarios

- CMAQv4.7.1_Release Notes.doc: RELEASE_NOTES for CMAQv4.7.1 from ORD, Shawn Roselle

- met.2005.12EUS1.pdf:  Baker K. and P. Dolwick.  Meteorological Modeling Performance Evaluation for the Annual 2005 Eastern U.S. 12-km Domain Simulation, USEPA/OAQPS, February 2, 2009.

- met.2005.12WUS1.pdf:  Baker K. and P. Dolwick.  Meteorological Modeling Performance Evaluation for the Annual 2005 Western U.S. 12-km Domain Simulation, USEPA/OAQPS, February 2, 2009.

- met.2005.36US1.pdf:  Baker K. and P. Dolwick.  Meteorological Modeling Performance Evaluation for the Annual 2005 Continental U.S. 36-km Domain Simulation, USEPA/OAQPS, February 2, 2009.

-2009 aqchem_update.pdf: Roselle, S. and Carlton, A.  Updates to the CMAQ aqueous chemistry routine (aqchem).  August 5, 2009.

Attachments
