BPA: Latest Ozone Planning Activities

Last updated: 3/6/2013

BPA Attainment Area On-Road Mobile Source Emissions Inventory and MVEB Update SIP Revision

On February 4, 2013, the EPA published final approval of the BPA Attainment Area On-Road Mobile Source Emissions Inventory and Motor Vehicle Emissions Budget (MVEB) Update State Implementation Plan (SIP) Revision, which became effective March 6, 2013. This SIP revision replaced the on-road mobile source emissions inventories that were adopted in 2008 as part of the BPA maintenance plan for the 1997 eight-hour ozone standard, which were based on the United States Environmental Protection Agency's (EPA) MOBILE model, with those based on the EPA's Motor Vehicle Emission Simulator (MOVES) model. On-road mobile source emissions inventory updates included those for 2005, 2011, 2014, 2017, and 2021. In addition, 2021 nitrogen oxides and volatile organic compounds MVEBs were updated based on the MOVES-based emissions inventories.

A public hearing for this SIP revision was offered on August 1, 2012; however, the hearing was not opened because no one signed in to speak. The public comment period was opened on June 29, 2012, and closed on August 3, 2012. No comments were received concerning this SIP revision, and it was adopted by the commission on November 14, 2012.

• SIP Revision
• Appendix D: BPA Area On-Road Emissions Inventories for SIP Submission - 2005, 2011, 2014, 2017, and 2021, TTI Report, February 2012

Redesignation to Attainment for the 1997 Eight-Hour Ozone Standard

On December 10, 2008, the commission approved an Eight-Hour Ozone Redesignation Request and Maintenance Plan SIP Revision for the BPA ozone nonattainment area. The SIP revision requested that the EPA redesignate the BPA area to attainment for the 1997 eight-hour ozone NAAQS and demonstrated how the area would maintain compliance with the standard through 2021.

On October 20, 2010, the EPA published a final rule in the Federal Register (75 FR 64675) , effective November 19, 2010, approving the redesignation request and maintenance plan and finalizing a determination that the BPA area is in attainment of the revoked one-hour ozone standard. The EPA's determination to redesignate signifies that the BPA area has met all of the applicable Federal Clean Air Act requirements for the purpose of redesignation to attainment.

With redesignation to attainment for the 1997 eight-hour ozone standard and a determination of attainment for the one-hour ozone standard, no new ozone reduction strategies will have to be developed for either standard as long as the area continues to monitor ozone levels below the 1997 eight-hour ozone standard; however, current strategies to reduce ozone in the BPA area will remain in place.