Correction to MOVES2010b Database

Today (02/05/13), we are releasing an updated version of the MOVES2010b installation suite that includes an updated default database (dated 10/30/2012) that corrects an error in the original MOVES2010b database.  We recommend that MOVES2010b users use the installation suite to replace the original database (dated 4/10/2012) with this new one.  However, users who have already done significant work with the original database can complete that work.  We are also posting an updated version of the MOVES2010b Q&A document (include link) which discusses the revision in more detail.  Here is an excerpt from that Q&A document that describes the correction:
 
During ongoing MOVES development work, EPA staff discovered an  error in the MOVES database that was originally released with the April 2012 version of MOVES2010b.  This error affected only hydrocarbon emissions from the vapor venting process in gasoline vehicles after calendar year 2020.  As a result of this error, the April 2012 version of MOVES2010b underestimated hydrocarbon emissions beginning in 2021.  The error is small in 2021, but gradually increases with fleet turnover over time.  For example, in generic testing, the error resulted in underestimating total volatile organic compounds (VOCs) by less than 0.5% in 2021, to almost 6.5% in 2040.  This error is unique to the 4/10/2012 database originally included with the April 2012 version of MOVES2010b and does not occur in MOVES2010a or MOVES2010. This error also does not affect any other pollutants or precursors that were estimated by the April 2012 version of MOVES2010b. 

Questions about this update should be directed to [email protected].

Correction to MOVES2010b Database

Today (02/05/13), we are releasing an updated version of the MOVES2010b installation suite that includes an updated default database (dated 10/30/2012) that corrects an error in the original MOVES2010b database.  We recommend that MOVES2010b users use the installation suite to replace the original database (dated 4/10/2012) with this new one.  However, users who have already done significant work with the original database can complete that work.  We are also posting an updated version of the MOVES2010b Q&A document (include link) which discusses the revision in more detail.  Here is an excerpt from that Q&A document that describes the correction:
 
During ongoing MOVES development work, EPA staff discovered an  error in the MOVES database that was originally released with the April 2012 version of MOVES2010b.  This error affected only hydrocarbon emissions from the vapor venting process in gasoline vehicles after calendar year 2020.  As a result of this error, the April 2012 version of MOVES2010b underestimated hydrocarbon emissions beginning in 2021.  The error is small in 2021, but gradually increases with fleet turnover over time.  For example, in generic testing, the error resulted in underestimating total volatile organic compounds (VOCs) by less than 0.5% in 2021, to almost 6.5% in 2040.  This error is unique to the 4/10/2012 database originally included with the April 2012 version of MOVES2010b and does not occur in MOVES2010a or MOVES2010. This error also does not affect any other pollutants or precursors that were estimated by the April 2012 version of MOVES2010b. 

Questions about this update should be directed to [email protected].