Motor Vehicle Emissions and Budgets Documentation

This page updated August 31, 2004.


Southeast Desert Modified Air Quality Management Area
2004 Southeast Desert Modified
Ozone State Implementation Plan

The Southeast Desert Modified Air Quality Management Area covers the Victor Valley/Barstow region in San Bernardino County (Mojave Desert), the Coachella Valley/San Jacinto region in Riverside County (Coachella), and the Antelope Valley region in Los Angeles County (Antelope Valley).  Mojave Desert is the responsibility of the Mojave Desert Air Quality Management District (Mojave Desert AQMD).  Coachella's air pollution control program is under the jurisdiction of the South Coast Air Quality Management District (South Coast AQMD).  Antelope Valley is the responsibility of the Antelope Valley Air Quality Management District (Antelope Valley AQMD).  The Antelope Valley AQMD contracts with the staff of the Mojave Desert AQMD for administrative services, including planning and rule development.

Each district is responsible for developing the portion of the 2004 Southeast Desert Modified Ozone State Implementation Plan (2004 SED SIP) which falls within their jurisdiction.  ARB will submit the 2004 SED SIP to U.S. EPA after each district adopts and transmits their portion of the SIP and supporting materials to ARB.

The motor vehicle emissions budget is a critical piece of the 2004 SED SIP.  To ensure that a single budget is established for the entire Southeast Desert ozone nonattainment area, each district notices for public review and comment their portion of the Southeast Desert budget.  The last district to take local action, in addition to noticing and adopting their portion of the budget, also notices and adopts the full 2004 SED SIP budget, recognizing the previous actions of the other two districts.

Upon a budget adequacy finding by U.S. EPA, the 2004 SED SIP budgets will be used in transportation conformity determinations.

The draft budgets listed and documented below represent the draft 2004 SED SIP budgets, along with supporting materials under consideration by each of the three districts within the Southeast Desert.

The South Coast AQMD adopted the Coachella Valley Portion of the SED SIP on August 1, 2003, and the Coachella portion of the SED SIP budget on November 7, 2003.  Antelope Valley AQMD and the Mojave Desert AQMD released draft Plans for public review and comment. Both districts anticipate taking the Plans to their respective Boards in April 2004.

Motor Vehicle Emissions Budgets

2004 Southeast Desert Modified Ozone State Implementation Plan

Ozone
(summer, tons per day)

 

2005

2007

ROG

26.5

23.2

NOx

68.3

63.2


These budgets were developed in close coordination with the South Coast AQMD, the Antelope Valley AQMD, the Mojave Desert AQMD, and the Southern California Association of Governments (SCAG).  The budgets include the latest data available at the time of budget development.  The following links provide more detailed information regarding the methodologies, model runs, and results used in the development of these budgets.
     
SED Budget Summary and Derivation   (MS Word 97 -- 40 KB)
     
SED Inventory Spreadsheet  
     
Summary of Methods Used to Develop Mojave Desert and Antelope Valley Portions of SED Budget   (MS Word 97 -- 28 KB)
     
Mojave Desert and Antelope Valley Baseline Planning Inventory EMFAC2002 Input Files   (WinZip -- 109 KB)
     
Summary of Methods Used to Develop Coachella Valley Portion of SED Budget   (MS Word 97 -- 37 KB)
     
Baseline Planning Inventory Spreadsheet for Coachella Valley   (MS Excel 97 -- 1.36 MB)
     
Coachella Valley Baseline Planning Inventory EMFAC2002 Input Files   (WinZip -- 78 KB)
     
Summary of Methods Used to Develop Mojave Valley Portion of SED Budget*   (MS Word 97 -- 34 KB)
     
Baseline Planning Inventory Spreadsheet for Mojave Valley*   (MS Excel 97 -- 92 KB)
     
Caltrans Count Data Used for Mojave Valley*  
     
Motor Vehicle Emission Factor Model Used for the SED SIP:
EMFAC2002 v2.2 (April 23, 2003)
 
     

*The "Mojave Valley" represents a portion of San Bernardino County within the Mojave Desert Air Basin that is not captured in SCAG's travel demand model.   ARB and SCAG developed the methodology described in the documentation to account for the emissions from this portion of the SED region.

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