Determination of Attainment and Approval of Base Year Emissions Inventories for the Imperial County, California Fine Particulate Matter Nonattainment Area

The Environmental Protection Agency (EPA) is determining that the Imperial County, California Moderate nonattainment area ("the Imperial County NA") has attained the 2006 24-hour fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standard (NAAQS or "standard"). This determination, also known as a clean data determination (CDD), is based upon complete, quality-assured, and certified ambient air monitoring data showing that the area has monitored attainment of the 2006 24-hour PM<INF>2.5</INF> NAAQS based on the 2013-2015 data available in the EPA's Air Quality System database. As a consequence of this determination of attainment, certain Clean Air Act (CAA) requirements that apply to the Imperial County Air Pollution Control District (ICAPCD or "District") shall be suspended for so long as the area continues to meet the 2006 24-hour PM<INF>2.5</INF> NAAQS. The area remains nonattainment for the 2012 annual PM<INF>2.5</INF> NAAQS. The EPA is also approving a revision to California's state implementation plan (SIP) consisting of the 2008 emissions inventory for the Imperial County NA submitted by the California Air Resources Board (CARB or "State") on January 9, 2015. This action is being taken under the CAA. Elsewhere in this issue of the Federal Register, we are proposing approval and soliciting written comment on these actions. If we receive adverse comments on this direct final rule that result in withdrawal of the entire rule or any part(s) of it, we will address those comments when we finalize the proposal. The EPA does not plan to institute a second comment period on this action. Any parties interested in commenting must do so at this time.