Appendix D 

Proposed Updates to the Transportation Conformity Budgets Identified in 

the San Joaquin Valley 2007 Ozone Plan. 
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May 14, 2007 Appendix D 1 

Appendix D 

Proposed Updates to the Transportation Conformity Budgets Identified in 

the San Joaquin Valley 2007 Ozone Plan. 

The transportation conformity budgets established in the San Joaquin Valley 

2007 Ozone Plan were created using the EMFAC2007 on-road mobile source 

emissions forecasting model. EMFAC2007 allows users to input the most up-todate planning estimates for a wide array of input parameters used to drive the 

model, via a user-friendly interface. These input parameters include vehicle 

travel activity, vehicle population data, and vehicle speed profile data. If specific 

data are not provided, the EMFAC2007 model provides default data specific to 

the region for which the estimates are being generated. 

Summary of Update: Madera County

Years Affected

2008, 2011, 2014, 2017, 2020, and 2023. 

Reason for update:

As discussed in Chapter 9 of the 2007 Ozone Plan, the Madera County 

transportation conformity budgets were developed using EMFAC2007 default 

vehicle activity data, which reflects data previously submitted by the Madera 

County MPO. Madera County recently provided more refined vehicle activity; 

however, this updated activity data was not available in time for inclusion in the 

District Final draft 2007 Ozone Plan. Subsequently, the MPO has requested that 

ARB update the conformity budgets for Madera County to reflect this refined 

data. Table 1 lists the vehicle miles traveled (VMT) activity and population 

activity that underlie this update. Table 2 lists the 2007 Ozone Plan 

transportation conformity budgets for Madera County as well as the proposed 

updates to the transportation conformity budget which, upon Air Resource Board 

approval, will replace those included in the San Joaquin Valley 2007 Ozone Plan. 
May 14, 2007 Appendix D 2 

Table 1 

Updated Madera County On-road Vehicle Activity Projections 

(x 1,000) 

Year 

EMFAC2007 

Default 

Vehicle 

Travel 

(VMT) 

Updated 

Madera 

Vehicle 

Travel 

(VMT) 

EMFAC2007 

Default 

Vehicle 

Population 

Updated 

Madera 

Vehicle 

Population 

2008 5,059 5,065 112 112 

2011 5,578 5,558 124 123 

2014 6,107 6,022 134 132 

2017 6,711 6,673 145 144 

2020 7,327 7,324 156 156 

2023 7,728 7,890 166 170 

Table 2 

Updated On-road Transportation Conformity Budgets for Madera County 

(Summer Planning tons per day) 

ROG NOx 

Year 2007 Ozone 

Plan 

Updated 

Activity Data 2007 Ozone Updated Activity Data

2008 4.5 4.4 14.6 14.6 

2011 3.7 3.7 12.2 12.2 

2014 3.1 3.1 9.8 9.7 

2017 2.6 2.6 7.8 7.7 

2020 1.9 1.9 4.8 4.8 

2023 1.9 1.9 4.4 4.5 

Summary of Update: San Joaquin County

Years Affected

2008. 

Reason for Update

While reviewing the San Joaquin Valley 2007 Ozone Plan, ARB staff, working 

with the District and the transportation planning agency staffs, identified a 

technical error in the input file used to generate the 2008 transportation 

conformity budgets. The vehicle speed profile input file only included updates for 

passenger car speed for light-duty automobiles. Light- and medium-duty trucks 

and motorcycles all relied on EMFAC2007 defaults for these categories, rather 
May 14, 2007 Appendix D 3 

than the updates provided by the San Joaquin County Council of Governments. 

Table 3 lists the corrected 2008 transportation conformity budget for San Joaquin 

County. 

Table 3 

Updated On-road Transportation Conformity Budgets for 

San Joaquin County 

(Summer Planning tons per day) 

ROG NOx 

Year 2007 Ozone 

Plan Updated 2007 Ozone Updated 

2008 13.9 13.9 39.9 40.0 

Recommendations 

ARB staff proposes to update the Madera County transportation conformity 

budgets for 2008, 2011, 2014, 2017, 2020, and 2023 in the San Joaquin Valley 

2007 Ozone Plan to include the updated activity data. 

ARB staff proposes to update the 2008 San Joaquin County transportation 

conformity budgets in the San Joaquin Valley 2007 Ozone Plan to reflect vehicle 

speed data consistent with San Joaquin County’s transportation data submitted 

for the 8-hour Ozone SIP development. 

Additional data is available on-line at: 

http://www.arb.ca.gov/planning/sip/2007sip/2007sip.htm