2013 State Implementation Plan for the 2006 24-hour PM2.5 Moderate Nonattainment Area Categories Topics Air Quality Plans Programs California State Implementation Plans Type Information At a public meeting to be held on December 18, 2014, the California Air Resources Board approved the Imperial County 2013 State Implementation Plan for the 2006 24-hour PM2.5 Moderate Nonattainment Area.CARB DocumentsSubmittal letter to U.S. EPA (1/9/2015)CARB Resolution (14-43)Public Notice to consider the approval of the Imperial County 2013 State Implementation Plan for the 2006 24-hour PM2.5 Moderate Nonattainment AreaCARB Staff Report: Analysis of the Imperial County 2013 State Implementation Plan for the 2006 24-Hour PM2.5 Moderate Nonattainment AreaDistrict DocumentsFinal PlanU.S. EPA DocumentsDetermination of Attainment of the 2006 24-hour PM2.5 Standard (82 FR 21711, eff. 6/9/2017) Related Resources 2024 Transport State Implementation Plan Amendment 2023 Carbon Monoxide SIP Revision 2024 San Joaquin Valley PM2.5 Plan