South Coast Air Quality Management Plans

This page last reviewed March 12, 2014


This page contains information regarding recent and historical State Implementation Plan (SIP) activities for 8-hour ozone, PM2.5, PM10, and lead in the South Coast Air Basin.  Below you will find links to:

2012 South Coast Ozone and PM2.5 Plans
2012 Lead SIP for Los Angeles County 2011 8-Hour Ozone and PM2.5 revisions
2011 PM2.5 Progress Report
2010 South Coast Air Basin PM10 Maintenance Plan
2010 Coachella Valley PM10 Maintenance Plan
2008 Ozone Early Progress Plans
2007 South Coast and Coachella Valley 8-Hour Ozone and PM2.5 Plan

2005 Carbon Monoxide Plan
2003 1-Hour Ozone and PM10 Plan

Associated documents such as letters submitting the plan to ARB and the U.S. Environmental Protection Agency, resolutions, transportation conformity budgets, staff reports, and public hearing notices are also available below.

Additional information can be found on the South Coast Air Quality Management District website.

2012 South Coast Ozone and PM2.5 State Implementation Plan

ARB Documents
    • Staff Report
      • Appendix A:  SCAQMD Submittal Letter to ARB
      • Appendix B:  SCAQMD 2012 Board Resolution
      • Appendix C:  Link to South Coast 2012 AQMP
      • Appendix D:  Link to U.S. EPA Approval and Promulgation of Implementation Plans; California; 2007 South Coast PM2.5 Plan and 2007 State Strategy
      • Appendix E:  Link to U.S. EPA Approval of Air Quality Implementation Plans; California; South Coast; Attainment Plan for 1997 8-Hour Ozone Standards
Public Notice
  • Public Notice to Consider the Approval of the South Coast 2012 AQMP
District Documents

2012 Lead State Implementation Plan for Los Angeles County 

On May 24, 2012, the Air Resources Board (ARB) approved the SIP revision for the federal lead standard, which U.S. EPA revised in 2008.  The SIP revision addresses attainment of the federal lead standard in the South Coast Air Basin portion of Los Angeles County, the only area in California designated as nonattainment for lead.  Lead concentrations in this nonattainment area have been below the level of the federal standard since December 2011.  



2011 Proposed 8-Hour Ozone State Implementation Plans Revisions and Technical Revisions to the PM2.5 State Implementation Plan Transportation Conformity Budgets for the South Coast and San Joaquin Valley Air Basins

On July 21, 2011, the Air Resources Board (ARB) approved SIP revisions limited to updating the ARB rulemaking calendar, adjustments to transportation conformity budgets, revisions to reasonable further progress tables and associated reductions for contingency purposes, and an update describing ARB's actions to identify advanced emission control technologies for the South Coast and the San Joaquin Valley.  ARB also approved technical revisions to the PM2.5 SIP transportation conformity budgets for the South Coast and San Joaquin Valley.  



2011 Progress Report on Implementation of PM2.5 State Implementation Plans (SIP) for the South Coast and San Joaquin Valley Air Basins and Proposed SIP Revision
On April 28, 2011, ARB approved a progress report and proposed revisions to the California SIP for submittal to the U.S. EPA. ARB’s proposed PM2.5 SIP revisions are limited to an updated calendar of ARB rulemaking, adjustments to transportation conformity budgets, and revisions to reasonable further progress tables and associated reductions for contingency purposes for the South Coast and the San Joaquin Valley. The proposed Board action also includes approval for submittal to U.S. EPA of revisions to the PM2.5 and ozone SIP for the South Coast Air Basin and Coachella Valley adopted by the South Coast Air Quality Management District on March 4, 2011.  

ARB Documents  District Documents

            2011 AQMD Board Item

South Coast Air Basin PM10 Redesignation Request, Maintenance Plan, and Conformity Budgets 
ARB Documents
At a public meeting on March 25, 2010, the ARB approved the PM10 Redesignation Request, Maintenance Plan, and Transportation Conformity Budgets for the South Coast Air Basin.

Redesignation Request and Maintenance Plan

Transportation Conformity Budgets

District Documents

EPA Documents


2010 Coachella Valley PM10 Redesignation Request and Maintenance Plan 


At a public meeting on February 25, 2010, the ARB approved the Coachella Valley PM10 Redesignation Request and Maintenance Plan. The South Coast Air Quality Management District requested redesignation of the Coachella Valley from serious nonattainment to attainment for the PM10 National Ambient Air Quality Standard.


ARB Documents

District Documents
  • Final PM10 Redesignation Request and Maintenance Plan for the Coachella Valley


2008 8-Hour Ozone Standard Early Progress Plans

At a public meeting on February 28, 2008, the ARB adopted ozone Early Progress Plans as amendments to the State Implementation Plan (SIP) in order to establish transportation conformity emission budgets for Coachella Valley, Ventura County, Antelope Valley - Western Mojave Desert, Eastern Kern County and Imperial County. Normally, conformity budgets are established with reasonable further progress (RFP) plans.  However, the U.S. Environmental Protection Agency (U.S. EPA) was in the process of revising regulations that established requirements for RFP plans and, therefore, was not able to approve RFP plans for these areas until the revision was complete. Setting conformity budgets with these early progress plans allowed the areas to move forward with transportation planning during the interim.

Ozone Early Progress Plans  (February 2008)

Appendix 
  2007 South Coast and Coachella Valley 8-Hour Ozone and PM2.5 Plans


At a public meeting on September 27, 2007, the ARB approved the South Coast Air Basin and the Coachella Valley 2007 Air Quality Management Plan for Attaining the Federal 8-hour Ozone and PM2.5 Standards. The plan projects attainment for the 8-hour Ozone standard by 2024 and the PM2.5 standard by 2015.

ARB Documents
Transportation Conformity Budgets
Public Notice
  • Public Notice to Consider the Approval of the Modified Transportation Conformity
    Budgets for the South Coast and Coachella Valley for 8-hour Ozone and PM2.5 
District Documents


2005 Carbon Monoxide Plan

Information regarding the 2005 Carbon Monoxide Redesignation Request and Carbon Monoxide Maintenance Plan for the South Coast Air Basin. The Plan establishes that the South Coast Air Basin has met the federal carbon monoxide air quality standard since 2002 and demonstrates that the Air Basin will continue to maintain the standard through at least 2015. This section includes links to air district documents, documentation of the motor vehicle emissions budgets for use in transportation conformity and related documents.


2003 1- Hour Ozone and PM10 Plan

Information regarding the comprehensive update to the South Coast air quality plan for ozone and particulate matter. This section includes documents produced by ARB, including Board Resolution 03-23 and transmittal letter to U.S. EPA, as well as a link to the South Coast District's website for local documents.

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