High Cube Warehouse Trip Rate Study for Air Quality Analysis

South Coast AQMD staff is overseeing the development of a study on high-cube warehouse vehicle and truck trip rates for California Environmental Quality Act (CEQA) air quality analyses; High-cube warehouses attract heavy duty diesel trucks on a daily basis.  Emissions from these trucks produce local and regional air quality impacts that need to be assessed and Mitigated to the maximum extent feasible if they are found significant pursuant to CEQA.  This study provides information regarding the number of vehicles (including trucks) that visit these types of facilities.

UPDATE Draft final results for the Warehouse Truck Trip Study were completed and were lower than South Coast AQMD recommended truck trip rates in the California Emissions Estimator Model (CalEEMod).  Staff recommends truck trip rates from the Institute of Transportation Engineers (ITE) for high cube warehouse projects located in South Coast AQMD.  Consistent with CEQA Guidelines, a CEQA document may use a non-default trip rate if there is substantial evidence in the recording supporting another rate is more appropriate for the air quality analysis.  


In order to assist in the evaluation of air quality impacts from development of high cube warehouses and distribution centers, South Coast AQMD staff initiated a warehouse truck trip study in 2012.  High-cube warehouses attract heavy duty diesel trucks on a daily basis.  Emissions from these trucks produce local and regional air quality impacts that need to be assessed and mitigated to the maximum extent feasible if they are significant pursuant to CEQA.  The goal of the study was to assess the number of trucks that visit warehouses located in South Coast AQMD.

The final study was produced in partnership with the Institute of Transportation Engineers, NAIOP, and South Coast AQMD is now available.

The study included several components including:
A business survey
• Two rounds of trip counts at high cube warehouses
• Third party review of the business survey (pages 12 to 24) and trip counts by researchers at UC Riverside

Two working groups were convened to provide input into South Coast AQMD’s truck trip counts and business survey. These included a Stakeholder Working Group (PDF, 126kb) consisting of warehouse developers, environmental groups, and local government transportation and planning staff and a Technical Working Group (PDF, 99kb) consisting of transportation researchers from local universities, two traffic consultants, and a representative from the Southern California Association of Governments (SCAG).  Slides from all of the public meetings held as the study progressed are available below.


 Mobile Source Committee  

October 17, 2014

Presentation (PDF, 380kb)

Mobile Source Committee  

July 25, 2014

Presentation (PDF, 847kb)

Working Group

July 17, 2014

Presentation (PDF, 542kb)

Back Up Slides (PDF, 398kb)

 Inland Empire 
Logistics Council

June 19, 2014

Presentation (PDF, 55kb)

 Southern California 
Leadership Council 
Warehouse Working Group

March 14, 2014

Presentation (PDF, 1.10MB)

Working Group

December 12, 2013

Presentation same as
October 11, 2013 Meeting


November 6, 2013

Presentation (PDF, 883kb)

Working Group

October 11, 2013

Presentation  (PDF, 324kb)

 Press Enterprise Forum
on Goods Movement
and Air Quality

September 12, 2013

Presentation (PDF, 2.83MB)

 Environmental Justice 
Advisory Group

July 26, 2013

Presentation (PDF, 1.27MB)

Working Group

June 13, 2013

Conference Call (PDF, 536kb)

 Moreno Valley Chamber 
of Commerce Legislative 
Affairs Committee

March 8, 2013

Presentation  (PDF,900kb)

Working Group

October 30, 2012

Presentation (PDF,358kb)

Working Group

August 9, 2012

Conference Call (PDF, 653kb)

Working Group

August 1, 2012

Conference Call (PDF, 655kb)

Working Group

July 18, 2012

Agenda (PDF, 28kb)

Presentation (PDF, 2,015kb)

Working Group

June 28, 2012

Agenda (PDF, 6kb)

Presentation (PDF, 246kb)

Working Group

June 6, 2012

Conference Call (PDF, 17kb)

Working Group

May 24 (No Meeting)

Email Update (PDF, 203kb)

Working Group

April 3, 2012

Agenda (PDF, 18kb)

Mobile Source

March 16, 2012


Presentation (PDF, 623kb>)

Working Group

March 8, 2012

Presentation (PDF, 1233kb)

Working Group

January 25, 2012

Presentation (PDF, 1258kb)


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