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Texas SIP Revisions

Links to State Implementation Plan (SIP) Revisions, other air quality plans, and agreements to improve air quality.

This page provides quick access to complete texts of Texas air quality plans. Click the title of the plan for more details (where available). All air quality plans, including those that have since been superseded, withdrawn, or deleted, are included here for reference. Information is organized chronologically into the following categories:


SIP Revisions

A SIP revision is made up of a narrative section, which is like a summary report, and typically will consist of various rules and agreements to legally fulfill what is written in the narrative.

Only one SIP exists for each state. For Texas, this document was initially approved in May 1972. Rather than rewriting the entire SIP each time changes are made, parts of the SIP are simply revised as needed.

(Help with PDF and Downloading Files.)

Date SIP Revision Title / Rule Log HGB DFW BPA ELP NETX Other
4/24/19 El Paso Redesignation Request and Maintenance Plan SIP Revision for the One-Hour Ozone NAAQS
(2018-029-SIP-NR)
X
3/27/19 DFW Redesignation Request and Maintenance Plan SIP Revision for the One-Hour and 1997 Eight-Hour Ozone NAAQS
(2018-028-SIP-NR)
X
1/30/19 BPA One-Hour Ozone Redesignation Request and Maintenance Plan and 1997 Eight-Hour Ozone Second 10-Year Maintenance Plan SIP Revision
(2018-027-SIP-NR)
         
12/12/18 HGB One-Hour and 1997 Eight-Hour Ozone Redesignation Request and Maintenance Plan SIP Revision
(2018-026-SIP-NR)
X          
10/17/18 Anti-Tampering and EAC LIRAP SIP Revision
(2018-006-SIP-NR)
          X
8/8/18 2015 Ozone NAAQS Infrastructure SIP Revision
(2017-040-SIP-NR)
X X X X X (statewide)
8/8/18 2015 Ozone NAAQS Transport SIP Revision
(2017-039-SIP-NR)
X  X X (statewide)
8/8/18 DFW 2008 Eight-Hour Ozone RACT Update SIP Revision
(2017-001-SIP-NR)
         
12/15/16 HGB 2008 Eight-Hour Ozone Moderate AD SIP Revision
(2016-016-SIP-NR)
X          
12/15/16 HGB 2008 Eight-Hour Ozone Moderate RFP SIP Revision
(2016-017-SIP-NR)
X          
10/19/16 Collin County Lead Redesignation Request and Maintenance Plan SIP Revision
(2016-003-SIP-NR)
  X        
9/7/16 El Paso CO Limited Maintenance Plan SIP Revision
(2015-015-SIP-NR)
      X    
7/6/16 DFW 2008 Eight-Hour Ozone NAAQS Moderate AD SIP for the 2017 Attainment Year
(2015-014-SIP-NR)
  X        
11/4/15 2012 PM2.5 Infrastructure and Transport SIP
(2014-029-SIP-NR)
X X X X X (statewide)
6/3/15 DFW 2008 Eight-Hour Ozone NAAQS Moderate AD SIP
(2013-015-SIP-NR)
  X        
6/3/15 DFW 2008 Eight-Hour Ozone NAAQS Moderate RFP SIP
(2013-014-SIP-NR)
  X        
7/2/14 2008 Ozone NAAQS Emissions Inventory (EI) SIP
(2013-016-SIP-NR)
X X        
2/26/14 2014 Five-Year Regional Haze SIP
(2013-013-SIP-NR)
X X X X X (statewide)
2/12/14 Inspection Maintenance (I/M) SIP
(2013-041-SIP-NR)
X X   X   X
10/9/13 Stage II Vapor Recovery Decommissioning SIP
(2013-002-SIP-NR)
X X X X    
4/23/13 HGB MVEB Update SIP
(2012-002-SIP-NR)
X          
4/23/13 2010 SO2 Infrastructure and Transport SIP
(2012-022-SIP-NR)
X X X X X (statewide)
12/5/12 2008 Ozone Infrastructure and Transport SIP
(2012-004-SIP-NR)
X X X X X (statewide)
11/14/12 2010 NO2 Infrastructure and Transport SIP
(2012-016-SIP-NR)
X X X X X (statewide)
11/14/12 BPA MVEB Update SIP
(2012-005-SIP-NR)
    X      
8/8/12 Collin County Lead AD SIP
(2011-001-SIP-NR)
  X        
1/25/12 El Paso PM10 Revised MOA SIP
(2011-010-SIP-NR)
      X    
12/7/11 DFW Eight-Hour Ozone Serious AD SIP
(2010-022-SIP-NR)
  X        
12/7/11 DFW Eight-Hour Ozone Serious RFP SIP
(2010-023-SIP-NR)
  X        
12/7/11 HGB RACT Analysis Update SIP
(2010-028-SIP-NR)
X          
10/5/11 Lead Infrastructure Demonstration SIP
(2011-016-SIP-NR)
X X X X X (statewide)
10/5/11 General Conformity SIP Revision
(2011-002-SIP-NR)
X X X X    
8/17/11 Lead Transport Plan SIP
(2011-005-SIP-NR)
X X X X X (statewide)
11/18/10 Inspection and Maintenance (I/M) SIP
(2009-035-SIP-NR)
X X   X    

8/25/10

DFW ESL to TCM SIP
(2009-026-SIP-NR)
  X        
7/28/10 VIC Contingency Plan Revision
(2009-033-SIP-NR)
          X
3/10/10 HGB 1997 Eight-Hour Ozone Severe AD SIP
(2009-017-SIP-NR)
X          
3/10/10 HGB 1997 Eight-Hour Ozone Severe RFP SIP
(2009-018-SIP-NR)
X          
3/10/10 DFW RACT, Rule, and Contingency SIP
(2009-021-SIP-NR)
  X        

2/10/10

CAIR SIP
(2007-051-SIP-NR)
X X X X X (statewide)

2/10/10

Texas Portable Fuel Container SIP
(2009-024-SIP-NR)
X X X X X X
8/26/09 Collin County 2nd 10-Year Lead Maintenance Plan SIP
(2009-0065-SIP-NR)
  X        
2/25/09 Regional Haze SIP
(2007-016-SIP-NR)
X X X X X (statewide)
12/10/08 BPA 1997 Eight-Hour Ozone Redesignation Request and Maintenance Plan SIP
(2008-006-SIP-NR)
    X      
12/10/08 DFW 1997 Eight-Hour Ozone AD (DERC) SIP
(2008-016-SIP-NR)
  X        
11/5/08 DFW 1997 Eight-Hour Ozone AD (Contingency Measures Plan) SIP
(2008-016A-SIP-NR)
  X        
4/16/08 Ozone and PM2.5 Transport SIP
(2007-057-SIP-NR)
X X X X X (statewide)
1/30/08 El Paso CO Maintenance Plan SIP
(2007-014-SIP-NR)
      X    
6/27/07 Stage II Vapor Recovery Program 30 TAC 115 Amendment SIP
(2006-049-115-EN)
X X X X    
6/27/07 2007 Transportation Conformity SIP
(2006-046-114-EN)
X X X X    
6/27/07 Transportation Air Quality Cleanup SIP
(2006-050-114-EN)
X X X X    
5/23/07 DFW 1997 Eight-Hour Ozone Moderate AD SIP
(2006-013-SIP-NR)
  X        
5/23/07 DFW 1997 Eight-Hour Ozone Moderate RFP SIP
(2006-031-SIP-NR)
  X        
5/23/07 HGB 1997 Eight-Hour Ozone AD SIP
(2006-027-SIP-NR)
X          
5/23/07 HGB 1997 Eight-Hour Ozone Moderate RFP SIP
(2006-1892-SIP)
X          
3/7/07 VIC Eight-Hour Ozone Maintenance Plan SIP
(2006-023-SIP-NR)
          X
7/12/06 Clean Air Interstate Rule
(2005-048-SIP-NR)
X X X X X (statewide)
7/12/06 Clean Air Mercury Rule
(2005-049-SIP-NR)
X X X X X (statewide)
1/11/06 El Paso CO Redesignation Request and Maintenance Plan SIP
(2005-028-SIP-NR)
      X    
1/11/06 El Paso 1997 Eight-Hour Ozone Maintenance Plan SIP
(2005-027-SIP-NR)
      X    
10/26/05 SIP Revision: Inspection / Maintenance (I/M) SIP
(2005-026-114-EN)
      X    
9/28/05 BPA 1997 Eight-Hour Ozone AD SIP
(2005-020-SIP-NR)
    X      
4/27/05 DFW 5% IOP SIP
(2004-096-SIP-AI)
  X        
4/27/05 2005 Transportation Conformity SIP
(2005-002-114-NR)
X X X X    
3/23/05 Stage II Vapor Recovery Program Technology Updates SIP
(2005-001-SIP-AI)
X X X X X  
12/15/04 BPA SIP Revision
(2004-084-SIP-NR)
    X      
12/1/04 HGB Mid-Course Review SIP
(2004-042-SIP-NR)
X          
11/17/04 Austin EAC SIP
(2004-086-SIP-NR)
          X
11/17/04 San Antonio EAC SIP
(2004-085-SIP-NR)
          X
11/17/04 North East Texas EAC SIP
(2004-077-SIP-NR)
        X  
Date SIP Revision Title / Rule Log HGB DFW BPA ELP NETX Other
10/27/04 HGB Rate-of-Progress SIP
(2004-049b-SIP-NR)
X          
10/27/04 BPA Ozone ROP SIP
(2004-049a-SIP-NR)
    X      
10/27/04 BPA Ozone AD SIP
(2004-053-SIP-NR)
    X      
9/15/04 I/M SIP: Chambers, Liberty, and Waller Counties Program Removal
(2004-035-114-AI)
 X          
1/14/04 NCTCOG MOA SIP
(2003-0994-SIP)
  X        
10/8/03 I/M SIP: Chambers, Liberty, and Waller Counties Program Delay
(2003-034-114-AI)
X X X X X X
4/30/03 2003 Transportation Conformity SIP
(2003-008-114-SIP-AI)
X X X X    
9/8/03 Unofficial Complete HGB SIP X          
3/18/03 Unofficial Complete DFW SIP   X        
3/5/03 2003 DFW One-Hour Ozone Attainment SIP
(2003-008-114-SIP-AI)
  X        
2/5/03 VIC Limited Maintenance SIP
(2002-047-SIP-AI)
          X
12/13/02 2002 HGB One-Hour Ozone AD Follow-Up SIP (December)
(2002-046a-SIP-AI)
X          
12/4/02 I/M SIP: El Paso OBD Testing Contingency Measure
(2002-068-114-AI-SIP)
X X   X    
11/6/02 Stage II Vapor Recovery Program Testing Requirements SIP
(2002-012-115-AI-SIP)
X X X X    
9/25/02 2002 HGB One-Hour Ozone AD Follow-Up SIP (September)
(Speed Limit/VMEP)
(2002-046a-SIP-AI)
X          
6/13/02 Visibility Protection
SIP Phase I
          X
3/13/02 NE Texas Ozone SIP
(2001-026-SIP-AI)
        X  
10/24/01 I/M SIP: DFW, Houston-Galveston, and El Paso Nonattainment Areas Revision
(2001-035-114-AI)
X X   X    
Date SIP Revision Title / Rule Log HGB DFW BPA ELP NETX Other
9/26/01 2001 HGB Follow-Up One-Hour Ozone AD and ROP SIP
(2001-007-SIP-AI)
X          
8/22/01 2001 DFW One-Hour Ozone AD SIP
(2001-025-SIP-AI)
  X        
12/6/00 2000 HGB One-Hour Ozone AD and Post-1999 ROP SIP
(2000-011-SIP-AI)
X          
12/6/00 I/M SIP: HGB Nonattainment Area Program Extension
(2000-011-SIP-AI)
X          
5/3/00 Transportation Control Measures
Vehicle Miles Traveled SIP

(1999-068-SIP-AI)
X          
4/19/00 NE Texas Flexible Attainment Region Agreed Order SIP
(1999-022-SIP-AI)
(1999-055-SIP-AI)
        X  
4/19/00 I/M SIP: New Testing Requirements in All Program Areas
(1999-055C-SIP-AI)
X X X      
4/19/00 2000 DFW One-Hour Ozone AD SIP
(1999-055-SIP-AI)
  X        
4/19/00 2000 HGB One-Hour Ozone AD SIP
(1999-055-SIP-AI)
X          
4/19/00 BPA One-Hour Ozone Attainment Demonstration Phase II SIP
(1999-056-SIP-AI)
    X      
4/19/00 Regional SIP
(1999-056-SIP-AI)
X X X X X X
4/5/00 Gasoline (RVP) SIP
(2000-002-SIP-AI)
X X X   X X
Date SIP Revision Title / Rule Log HGB DFW BPA ELP NETX Other
10/15/99 DFW 9% Tech Rev SIP
(2000-002-SIP-AI)
  X        
10/27/99 HGB Attainment SIP Part II
(1999-021-SIP-AI)
X          
10/27/99 BPA One-Hour Ozone Attainment Demonstration Phase I SIP
(1999-018-SIP-AI)
    X      
7/28/99 Collin Lead SIP
(1998-023-SIP-AI)
          X
6/30/99 Gasoline SIP
(1998-058-SIP-AI)
X X X   X X
5/12/99 NE Texas Flexible Attainment Region SIP
(1996-175-SIP-AI)
        X  
2/24/99 1999 DFW One-Hour Ozone AD SIP
(1998-046-SIP-AI)
  X        
11/18/98 1998 Transportation Conformity SIP
(1998-003-114-AI)
X X X X   X
7/29/98 Texas Clean Fleet: Federal Clean Fleet Fuel Program Substitution SIP
(1997-139-114-AI)
X X   X    
6/3/98 I/M SIP: Revised Testing Procedures in All Program Areas
(1998-004-SIP-AI)
X X X      
5/6/98 1996 HGB One-Hour Ozone AD and Post-1996 ROP SIP
(1997-184-SIP-AI)
X          
8/6/97 Vehicle Miles Traveled Offset Update SIP
(1997-184-SIP-AI)
X          
5/14/97 Harris County SO2 Agreed Order Modification SIP
(1996-181-SIP-AI)
X          
5/14/97 I/M SIP: Sticker Based Enforcement
(1997-119-SIP-AI)
X X X      
12/4/96 Texas Instruments SIP
(1996-130-SIP-AI)
  X        
7/24/96 Super SIP
(1996-109-SIP-AI, 1996-110-SIP-AI,
1996-111-SIP-AI, 1996-112-SIP-AI,
1996-113-SIP-AI)
X X X X   X
Date SIP Revision Title / Rule Log HGB DFW BPA ELP NETX Other
7/24/96 Texas Clean Fleet: Federal Clean Fuel Fleet Program Revised Substitution SIP (Withdrawn)
(1995-153-114-AI)
X X   X    
5/29/96 I/M SIP: DFW, Houston-Galveston, and El Paso Nonattainment Areas Program Implementation
(1996-104-114-AI)
X X   X    
3/20/96 Bell Helicopter SIP
(1995-166-SIP-AI)
  X        
12/13/95 Post-1996 Rate-of-Progress for Beaumont/Port Arthur and Houston/Galveston Ozone Nonattainment Areas SIP/HGB
(1995-156-SIP-AI)
X   X      
9/13/95 El Paso CO Attainment Demonstration SIP
(1995-106-SIP-AI)
      X    
8/23/95 Milam County SO2 SIP
(1995-003-SIP-AI)
          X
11/16/94 General Conformity SIP X X X X    
11/9/94 Post-1996 Rate-of-Progress for Beaumont/Port Arthur and Houston/Galveston SIP X   X      
10/12/94 Vehicle Miles Traveled Offset Supplement SIP X          
10/19/94 1994 Transportation Conformity SIP X X X X   X
9/21/94 1994 DFW One-Hour Ozone ROP SIP   X        
9/21/94 818 El Paso SIP       X    
8/31/94 I/M SIP: Enhancements to Existing Programs X X X X    
7/27/94 Victoria Redesignation SIP           X
7/94 Texas Clean Fleet: Texas Alternative Fuel Fleet Program Implementation SIP (Withdrawn) X   X X    
Date SIP Revision Title / Rule Log HGB DFW BPA ELP NETX Other
6/94 Harris County SO2 SIP X          
5/13/94 15% ROP SIP (Phase II) X X X X    
2/16/94 I/M SIP: El Paso and Houston New Testing Requirements X     X    
11/10/93 Stage II Vapor Recovery Program Implementation Update SIP X X X X    
11/10/93 15% ROP SIP (Phase I) X X X X    
10/93 Post-1990 CO SIP for Moderate Area - El Paso       X    
10/27/93 Vehicle Miles Traveled Offset SIP X          
6/18/93 Collin County Lead SIP   X        
6/18/93 Lockheed Corporation SIP   X        
6/18/93 Shell Corporation Site Specific SIP X          
4/93 El Paso Electrical Products SIP       X    
11/6/92 Texas Clean Fleet: Federal Clean Fuel Fleet Program Opt-Out SIP X   X X    
11/92 Small Business Stationary Source SIP X X X X X X
10/92 Vehicle Miles Traveled Offset Commitment SIP X          
10/92 Stage II Vapor Recovery Program SIP X X X X    
9/92 El Paso CO 30 TAC 114 Amendment SIP       X    
8/13/92 NOX RACT SIP X   X      
7/23/92 I/M SIP: Requirements for New and Existing Program Areas X X X X    
6/30/92 Employer Trip Reduction SIP X          
11/91 El Paso PM10 SIP       X    
5/89 El Paso PM10 Interim SIP       X    
Spring 1989 111(d) Plan for Sulfur X X X     X
5/88 PM10 SIP (Group II/III Areas) X X   X   X
Date SIP Revision Title / Rule Log HGB DFW BPA ELP NETX Other
12/18/87 Dallas/Tarrant Post-1982 Ozone SIP   X        
Summer 87 Class I Areas Visibility SIP (Phase I)           X
8/86 El Paso CO Commitment to Implement I/M Program SIP       X    
8/85 Post-1982 El Paso CO SIP       X    
8/85 Dallas / El Paso / Tarrant Post-1982 Ozone SIP   X   X    
11/84 Harris Inspection/Maintenance SIP X          
Summer 84 Dallas Lead SIP   X        
Spring 84 Dallas RSR Corporation Lead SIP   X        
12/3/82 Harris Ozone SIP X          
7/11/80 Total Suspended Particulates SIP   X   X   X
3/21/80 Lead SIP X X X X X X
3/30/79 Ozone, PM, CO SIP X X X X   X
8/15/76 1976 Complete SIP X X X X X X
4/15/75 1975 Complete SIP X X X X X X
2/15/74 1974 Complete SIP X X X X X X
4/15/73 1973 Complete SIP X X X X X X
1/26/72 1972 Complete SIP X X X X X X

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Early Action Compact (EAC) SIPs and Ozone (O3) Flex Plans

This section contains links to downloadable Early Action Compact (EAC) SIPs and O3 Flex plans. Click here for more information about Early Action Compact plans.

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Date Title ARR SAN NETX CC Other
6/18/08 Austin Eight-Hour O3 Flex Plan
(2007-020-MIS-NR)
X        
6/13/07 Corpus Christi Eight-Hour O3 Flex Plan
(2007-008-MIS-NR)
      X  
11/17/04 Austin Area 8-Hour Ozone Early Action Compact SIP Revision
(2004-086-SIP-NR)
X        
11/17/04 San Antonio Area 8-Hour Ozone Early Action Compact SIP Revision
(2004-085-SIP-NR)
  X      
11/17/04 Northeast Texas Area 8-Hour Ozone Early Action Compact SIP Revision
(2004-077-SIP-NR)
    X    
3/29/04 Austin/Round Rock MSA Clean Air Action Plan
Early Action Compact Exit the TCEQ
X        
3/31/04 Proposed AACOG Attainment Demonstration for the San Antonio EAC Region   X      
3/31/04 Clean Air Action Plan for Northeast Texas     X    
9/17/02 Corpus Christi O3 Flex Plan       X  
3/28/02 O3 Flex Plan for the Austin/San Marcos MSA X        

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Agreements (MOAs, MOUs, AOs)

This section lists agreements entered into by the TCEQ that pertains to the State Implementation Plan. Agreements include Memorandums of Agreement (MOAs), Memorandums of Understanding (MOUs), and Agreed Orders (AOs).

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Date Agreement Title HGB DFW BPA ELP NETX Other
8/8/12 Agreed Order with Exide Technologies: Collin County 2008 Lead NAAQS Attainment Demonstration
(2011-024-MIS-NR)
  X        
1/25/12 Revised MOA with City of El Paso
(2011-026-MIS-NR)
      X    
8/26/09 Agreed Order with Exide Technologies: Collin County Lead Maintenance Plan
(2009-0071-MIS)
  X        
8/05 Austin EAC Idling Restriction MOA           X
1/14/04 North Central Texas COG MOA   X        
12/15/04 Agreed Order with ISP Elastomers
(2004-078-SIP-NR)
    X      
12/15/04 Agreed Order with ExxonMobil Oil Corporation
(2004-079-SIP-NR)
    X      
12/15/04 Agreed Order with Huntsman Petrochemical Corporation, Port Arthur
(2004-080-SIP-NR)
    X      
12/15/04 Agreed Order with Mobil Chemical Company, Division of ExxonMobil Oil Corporation Part I
(2004-081-SIP-NR)
    X      
12/15/04 Agreed Order with Motiva Enterprises, LLC
(2004-082-SIP-NR)
    X      
12/15/04 Agreed Order with Premcor Refining Group, Inc.
(2004-083-SIP-NR)
    X      
12/15/04 Agreed Order with Huntsman Petrochemical Corporation, Port Neches
(2004-090-SIP-NR)
    X      
12/15/04 Agreed Order with Mobil Chemical Company, Division of ExxonMobil Oil Corporation Part II
(2004-081b-SIP-NR)
    X      
5/02 HGB TxDOT Ferries MOU X          
3/12/02 2002 Agreed Order with Eastman Chemical Company
(2001-0880-RUL)
        X  
3/12/02 TXU Generation Company LP AO
(2001-0879-RUL)
        X  
3/12/02 Southwestern Electric Power AO
(2001-0878-RUL)
        X  
10/9/01 City of El Paso MOA       X    
6/01 HGB Tugboat/Towing Vessel MOU X          
5/23/01 City of Dallas GSE MOA   X        
5/23/01 DFW Airport GSE MOA   X        
5/23/01 City of Fort Worth GSE MOA   X        
5/23/01 American Airlines GSE AO
(2000-1149-SIP)
  X        
5/23/01 Delta Airlines GSE AO
(2001-0221-AIR)
  X        
5/23/01 Southwest–Love Field GSE AO
(2001-0222-AIR)
  X        
3/21/01 Southwest-Hobby GSE AO
(2000-0827-SIP)
X          
12/4/00 HGB Railroad MOU X          
10/18/00 Houston Airport System GSE MOA X          
10/18/00 Continental GSE AO
(2000-0826-SIP)
X          
4/19/00 2000 Agreed Order with Eastman Chemical Company
(2000-0033-AIR)
        X  
4/19/00 Alcoa Inc. AO
(2000-0032-AIR)
          X
7/28/99 GNB Technologies Inc. AO
(99-0351-SIP)
  X        
7/28/99 GNB Inc. AO
92-09(k), 93-12, and 93-10
  X        
6/94 Harris County SO2 Agreed Orders X          

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Redesignation Substitutes

This section lists Redesignation Substitutes that have been developed by the TCEQ for nonattainment areas that have attained revoked standards.

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Date* Title HGB DFW BPA ELP NETX Other
7/22/14
8/18/15
HGB One-Hour and 1997 Eight-Hour Ozone Redesignation Substitutes  X          
8/18/15 DFW One-Hour and 1997 Eight-Hour Ozone Redesignation Substitute    X        

*Date of report submittal to EPA

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Other Air Quality Plans

This section lists other air quality-related plans which may not be directly related to Texas’ SIP, but which may be of general interest.

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How to Read These Tables

Date : The date the plan was formally adopted by the TCEQ (unless otherwise noted).

Title: Abbreviated title of the plan. Clicking on the title brings you to a Web page with additional information about that plan (such as proposed versions, responses to comments, appendices, associated rulemaking documents, etc.).

Rule Log Number: Official Texas Register Rule Log Number (where applicable)

PDF: Acrobat Portable Document Format version of the plan.

Geographic Areas: Clicking on the header will bring you to a Web page with additional information on that area. An “X” indicates that the plan in that row is effective in the area of that column.

  • HGB: Houston-Galveston-Brazoria nonattainment area.
  • DFW: Dallas-Fort Worth nonattainment area.
  • BPA: Beaumont-Port Arthur nonattainment area.
  • ELP: El Paso nonattainment area, attainment area and maintenance plans.
  • NETX: Northeast Texas Early Action Compact area.
  • ARR: Austin-Round Rock Early Action Compact area.
  • SAN: San Antonio Early Action Compact Area and Ozone Nonattainment Area (Deferred).
  • VIC: Victoria maintenance area.
  • CC: Corpus Christi near nonattainment area.
  • Other: Other areas that are subject to a particular plan.

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