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:	Community Multi-scale Air Quality model (CMAQ) used in
estimating CAPs and air toxics for the final light-duty vehicle
greenhouse gas rule

		

FROM:	Margaret Zawacki

		Assessment and Standards Division

		Office of Transportation and Air Quality

TO:		Docket EPA-HQ-OAR-2009-0472-DRAFT-####

DATE:		March 29, 2010

The purpose of this memorandum is to transmit the version of the CMAQ
code (v4.7.1) which was used in the air quality modeling analyses for
the final light-duty vehicle greenhouse gas rule.  The air quality
modeling analyses are discussed in Section III.G of the preamble,
Chapter 7 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 Chapter 5 of the RIA.  The
electronic version of CMAQ v4.7.1 can also obtained by contacting Sharon
Phillips (919-541-2138) or will be made available by April 15th, 2010 at
the CMAS website (http://www.cmascenter.org/).

The following is contained on the enclosed disc:

- CMAQv4.7.1.tar.gz: CMAQ photochemical model code for
compiling/building executable to run air quality model scenarios used
for the final light-duty vehicle greenhouse gas rule.

Attachments

