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EPA Approves Revisions to the Cincinnati-Hamilton Maintenance Air Quality SIP


By Kate E. Beatty, Attorney, Bingham Greenebaum Doll LLP

By direct final rule published January 29, 2013 (78 Federal Register 6035), EPA has approved Indiana’s and Ohio’s request to revise the Cincinnati-Hamilton 1997 8-hour ozone maintenance air quality SIP to replace the previously approved motor vehicle emissions budgets (MVEBs) with MVEBs for 2015 and 2020 developed using EPA’s Motor Vehicle Emissions Simulator (MOVES) emissions model. 

The MOVES model is based on analyses of millions of emission test results and considerable advances in EPA’s understanding of vehicle emissions.    Indiana submitted the SIP revision request on October 12, 2012 followed by a final submittal on December 11, 2012 after receiving no comments during the public review and comment period.  The submitted revision only sought to revise the on-road mobile source inventories and not the non-road inventories, area source inventories or point sources. 

The emissions estimates submitted by Indiana and Ohio demonstrate that the Cincinnati-Hamilton area emissions are declining and are continuing to decline as they remain below attainment levels.  As of the effective date of April 1, 2013, Indiana and Ohio must use the MOVES2010a-based budgets. The MOVES2010a-based budget contains minor revisions which do not affect the criteria pollutant emissions results from the MOVES2010 budget released in March 2010 (see 75 Federal Register 9411). 

To view a complete PDF of the First Quarter 2013 issue of the Air Quality Letter, click HERE.


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