On January 13, 2015, USEPA proposed to approve San Joaquin Valley Air Pollution Control District’s (SJVAPCD) revisions to California’s State Implementation Plan (SIP) addressing Clean Air Act (CAA) requirements for the PM2.5 National Ambient Air Quality Standards (NAAQS), with exception of interpollutant trading ratios identified in these SIP submittals. SJV is currently classified as a Moderate nonattainment area for the PM2.5 NAAQS standards though USEPA has proposed to reclassify it as a Serious nonattainment area. Moderate nonattainment areas must have a SIP containing a Moderate nonattainment plan for the SJV area to provide for attainment of the standards. The SIP revisions discussed in USEPA’s proposal are the 2012 PM2.5 plan, submitted March 4, 2013, and the Supplement, submitted November 6, 2014.

Additionally, finalization of this proposal would mean that the PM2.5 interpollutant trading ratios for nonattainment new source review (NNSR) would be disapproved. The CAA NNSR program requires that emissions from new or modified major stationary sources in nonattainment areas be offset by providing emissions reductions from the same or other sources in the area. USEPA may allow for interpollutant offsets, meaning that emissions of PM2.5 may be offset by reductions in a precursor, or emissions of a PM2.5 precursor may be offset by reductions in PM2.5 or a different PM2.5 precursor. The proposed ratios in the 2012 PM2.5 plan are 5.3 tpd of NOX emission reductions or 4.1 tpd of SOX emissions to offset 1 tpd of direct PM2.5 emission increase. However, USEPA is proposing to disapprove these proposed interpollutant offset ratios due to inadequacies in the technical demonstration and related documentation of the ratios. Therefore, upon finalization of USEPA’s proposal, these interpollutant offset ratios will not be allowed for the purposes of offsetting PM2.5 emissions from stationary sources within SJV.

Comments regarding this proposal must be received by February 27, 2015. More information can be found here.