The South Coast Air Basin met the 2006 and 1997 24-Hour PM2.5 standards based on ambient monitoring data from 2018-2020, subject to the U.S. EPA’s approval for removal of an exceptional event due to the Bobcat and El Dorado fires in 2020. A request to redesignate the South Coast Air Basin to attainment of the 2006 and 1997 24-Hour PM2.5 standards and a maintenance plan for PM2.5 through 2035 are developed to address Clean Air Act Requirements.

• Final PM2.5 Redesignation Request and Maintenance Plan (PDF, 3mb)
• Final PM2.5 Redesignation Request and Maintenance Plan - October 5, 2021 (PDF, 4mb)
• PM2.5 Maintenance Plan NOTICE OF PUBLIC HEARING November 5, 2021 - October 5, 2021 (PDF, 110k)
• Public Consultation Meeting Agenda - September 7, 2021 (PDF, 177k)
• Public Consultation Meeting Presentation - September 7, 2021 (PDF, 5mb)
• Draft 2021 PM2.5 Redesignation Request and Maintenance Plan for the 2006 and 1997 24-hour PM2.5 Standards for South Coast Air Basin - August 31, 2021 (PDF, 2MB)