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Air Quality Research and Contract Reports: On-Road Mobile Emissions Inventory

Reports related to inventories of air-pollutant emissions from on-road mobile sources written by contractors for the Texas Commission on Environmental Quality.

Reports from Air Quality Research and Contract Projects related to On-Road Mobile Source Emissions Inventory are posted here as PDF files (Help with PDF) unless otherwise specified. Some reports have companion data files in various formats.

For comments and questions regarding these reports, please e-mail us at aqp@tceq.texas.gov, put "On-Road Mobile EI Modeling Contract Report Inquiry" in the subject line, and include the web address of the report PDF file in the e-mail text or attache the original report PDF file.

Development of Oil and Gas Mobile Source Inventory in the Barnett Shale in the 12-County Dallas-Fort Worth Area - This report, developed through a work order with North Central Texas Council of Government (NCTCOG), documents the study to develop emissions inventories associated with Barnett Shale VMT and long-team idling of heavy duty diesel vehicles activities using MOVES based in the 12-county NCTCOG Metropolitan Planning Area (MPA), Collin, Dallas, Denton, Ellis, Hood, Hunt, Johnson, Kaufman, Parker, Rockwall, Tarrant, and Wise. (August 2012)

Characterization of Vehicle Activity and Emissions from Heavy-Duty Diesel Vehicles in Texas - This report, developed through a work order with Texas Transportation Institute (TTI), documents the estimation of vehicle miles traveled (VMT) proportions of local and pass-through heavy-duty diesel vehicles (HDDVs) throughout Texas with a focus on current and near non-attainment areas. This was achieved by comparing local and non-local VMT produced by HDDVs. TTI then produced emissions estimates using the VMT proportions and emission rates based upon the latest available Highway Performance Monitoring System based data and the MOVES model. The analysis years for this study are 2008–2030. (August 2011)

2011 Summer Fuel Field Study - This report and data files (zipped), developed through a work order with Eastern Research Group, Inc. (ERG), documents the data collection and analysis of samples of gasoline and diesel fuel collected from retail stations across Texas during the Summer of 2011. The data from this study are used to develop the physical properties and speciation profiles of gasoline and diesel fuel that are used in the development of mobile source episodic state implementation plans (SIPs), Periodic, Rate of Progress, and toxic emissions inventories, trend analysis, and control strategy analysis. These data are also used in photochemical air quality dispersion modeling, conformity and other sensitivity analysis. (August 2011)

Methodologies for Conversion of Data Sets for MOVES Model Compatibility - This report was developed by the Texas Transportation Institute (TTI) to investigate methods for utilizing existing transportation data sets to be compatible with the Motor Vehicle Emissions Simulator (MOVES) model from EPA. MOVES categorizes the on-road fleet into nine fuel types and thirteen "source use types" (SUTs). Recommended are made for querying the vehicle registration database from the Texas Department of Transportation (TxDOT) so that the final output can be compatible with the SUT age distribution format needed for MOVES. Recommendations are also made for using existing vehicle classification counts available from TxDOT for allocation of vehicle miles traveled (VMT) estimates by SUT. (August 2009)

2008 On-Road, Mobile Source Statewide Air Toxics Annual Emissions Inventory - This report was developed through a work order with the Texas Transportation Institute (TTI), to provide a 2008 Mobile Source Air Toxics (MSAT) in support of the Federal Clean Air Act Amendment (CAAA) requirement. MSAT is prepared for all 254 Texas Counties. This Toxics inventory estimates annual emissions, for various volatile organic compound (VOC) and metals, as well as diesel particulate matter and diesel exhaust organic gases. (June 2009)

Estimates of Emission Reductions from Performing OBDII Tests on 1997 and Newer Diesel Vehicles - This study was performed to obtain estimates of the emissions benefits that could be achieved from requiring annual emissions inspections on diesel-fueled vehicles in counties currently participating in I/M or planning to participate in the future. (October 2008)

2008 Summer Fuel Field Study - This report and data files (zipped), developed through a work order with Eastern Research Group, Inc. (ERG), documents the data collection and analysis of samples of gasoline and diesel fuel collected from retail stations across Texas during the Summer of 2008. The data from this study are used to develop the physical properties and speciation profiles of gasoline and diesel fuel that are used in the development of mobile source episodic state implementation plans (SIPs), Periodic, Rate of Progress, and toxic emissions inventories, trend analysis, and control strategy analysis. These data are also used in photochemical air quality dispersion modeling, conformity and other sensitivity analysis. (August 2008)

Preliminary Review of Data Sources To Identify Portion of Heavy-Duty Vehicle Activity in Texas Metropolitan Areas from Long-Haul Pass-Through Trucks - This report, provided by the Texas Transportation Institute (TTI), reviewes the different methodologies that could be employed to separate the "eighteen-wheeler" heavy-duty truck activity into both "short-haul" and "long-haul" components. The report both summarizes and compares the various advantages and disadvantages of the different data collection and survey approaches. No new data were collected for this study, but a sample of global positioning system (GPS) data was obtained for in-transit trucks to evaluate the feasibility of using existing electronic tracking information for identification of "pass-through" trucks. Using GPS for this purpose shows long-term promise, but current obstacles exist related to widespread data availability and the ability to satisfactorily post-process the information gathered. (August 2008)

2007 Summer Fuel Field Study - This report, developed through a work order with Eastern Research Group, Inc. (ERG), documents the data collection and analysis of samples of gasoline and diesel fuel collected from retail stations across Texas that is used to develop physical properties and speciation profiles of gasoline and diesel fuel used in the development of mobile source episodic state implementation plans (SIPs), Periodic, Rate of Progress, and toxic emissions inventories, trend analysis, and control strategy analysis. These data are also used in photochemical air quality dispersion modeling, conformity and other sensitivity analysis. (August 2007)

Link Speed Estimation Improvements for MOBILE6 Modeling Using TranStar Data - This report and its supplemental appendices, provided by the Texas Transportation Institute (TTI), document improvements for MOBILE6 modeling using TranStar data. TranStar is a consortium of four local government agencies responsible for transportation management in the Houston metropolitan area: Texas Department of Transportation (TxDOT), Harris County, Metropolitan Transit Authority of Harris County (METRO), and the City of Houston. The two types of historical TranStar data are identified as Automated Vehicle Identification (AVI) and Wavetronix. The larger AVI data set contains roadway segment distance and travel time data to estimate average operating speed. Variations in average operating speed by roadway segment from the AVI data set were compared for various episodes in both 2005 and 2006. The smaller Wavetronix data set is radar-based and includes traffic volume as well as speed. The 2005 and 2006 Wavetronix data were analyzed to verify the performance of speed model applications for the Houston travel network. (August 2007)

Development and Production of VMT Profiles for Non-School, Memorial Day, and Labor Day Weekends - This report, provided by the Texas Transportation Institute (TTI), documents analysis of Automatic Traffic Recorder (ATR) data collected by the Texas Department of Transportation (TxDOT) from 2000-2006 for these Texas areas: Austin, Beaumont/Port Arthur, Dallas/Fort Worth, El Paso, Houston/Galveston/Brazoria, San Antonio, Tyler/Longview, "urban" grouping for all areas referenced above, "rural" grouping for all areas not referenced above, and an aggregate Statewide summary for all 254 Texas Counties. For each area, ATR data were used to determine both the daily and hourly differences in vehicle miles traveled (VMT) distributions between "in-school" and "non-school" periods. In addition, both Memorial Day and Labor Day holiday weekends were compared to "regular" weekends to determine differences in both daily and hourly VMT distributions. (August 2007)

DFW Diesel Fraction Study - This report, developed through a work order with North Central Texas Council of Government (NCTCOG), documents the emission sensitivity of the diesel fraction and vehicle age distribution for diesel vehicle classes in MOBILE modeling, in the Dallas Forth worth nonattainment area. It also addresses how to reduce the variation in emissions by including interaction between the counties that account for commuter flow and regional distribution of heavy-duty vehicle travel. This report has two additional MS Excel files: Appendix B - Diesel Fraction and Appendix C - Vehicle Registration Distribution (August 2005).

TxLED VMT Estimation Project - This report, developed through a work order with Cambridge Systematics, Inc., documents development of Vehicle Miles of Travel (VMT) estimates for local and non-local trucks. This information is useful for determining the rule effectiveness for control strategies that will effect local trucks but not non-local trucks. The study included the DFW and HGB ozone nonattainment areas. (August 2004)

Heavy-duty Diesel Vehicle (HDDV) Idling Activity and Emissions Study: Phase 2 - Statewide Data Collection and Emission Inventory Development - Heavy-duty diesel vehicle (HDDV) emissions contribute to the production of NOx, a precursor of ozone formation. One source of HDDV NOx is the emissions produced during long term idling (more than 15 minutes). An emissions inventory for HDDV idling requires an accurate estimate of extended diesel truck idling activity. At the time of this report, there were no studies that comprehensively quantified the extent of diesel truck idling. The TCEQ contracted with Eastern Research Group (ERG) to develop a statewide On-Road Heavy-Duty Vehicle (HDV) Extended Idling Activity Database and Emissions Inventory for all counties in Texas. ERG was tasked with characterizing NOx emissions from heavy-duty trucks idling for more than 15 consecutive minutes at a time, for the following source generator categories: truck stops and travel plazas; state-maintained rest areas and travel centers; commercial marine ports; airports; and, inter-modal rail yards. (August 2004)

Assess Currently Available Houston Ship Channel Area VMT Mix Data and Identify Additional Data Required - This report, developed through a work order with TTI, reviewed the activities of HDDV8b in the Houston Ship Channel areas as it relates to the Harris county area. The current TxDOT vehicle classification data for the Houston ship channel area was reviewed and the VMT mix for the ship channel area was calculated using the currently available vehicle classification data. The procedures used and the result obtained are documented in this report. (August 2004)

Heavy-duty Diesel Vehicle (HDDV) Idling Activity and Emissions Study: Phase 1 - Study Design and Estimation of Magnitude of the Problem - This report, developed through a work order with Texas Transportation Institute (TTI), documents data collection and analysis done to develop a rough estimate of the activity and related emissions associated with extended idling by HDDVs in Texas, and the development of a study design for Phase 2 of the project, to accurately quantify extended truck idling activity and emissions. Phase 2 of the idle activity and emission inventory is documented in a separate report. (August 2003)

Evaluation of MOBILE for Application to Houston, TX - This report, developed through a work order with Environ International Corp, provides the result of evaluating MOBILE by comparing ratios of species in emissions inventories prepared using MOBILE with corresponding ratios in ambient data. In the study Environ compared estimates of emission ratios of non-methane hydrocarbon (NMHC) and carbon monoxide (CO) to nitrogen oxides (NOx) in a detailed, MOBILE6-based inventory that was developed for Houston with NMHC/NOx and CO/NOx ratios observed at several Houston area monitoring sites for the 1999-2001 summer ozone season. (November 2002)

2007 On-Road Mobile Source Episode Specific Emissions Inventories for the Beaumont-Port Arthur Ozone Nonattainment Area - This report, developed through a work order with TTI, summarizes the development of link-based on-road mobile source inventories utilizing MOBILE6 in the Beaumont-Port Arthur nonattainment area for the 2007 future case projection of the August 22 - September 1, 2000 ozone episode. A discussion of the MOBILE6 55 mph speed limit benefits for 2007 is included in the report. (August 2002)

2000 On-Road Mobile Source Episode Specific Emissions Inventories for the Beaumont-Port Arthur Ozone Nonattainment Area - This report, developed through a work order with TTI, summarizes the development of link-based on-road mobile source inventories utilizing MOBILE6 in the Beaumont-Port Arthur nonattainment area from August 22 - September 1, 2000. (August 2002)

2007 On-Road Mobile Source Episode Specific Emissions Inventories for the Houston-Galveston Ozone Nonattainment Area - This report, developed through a work order with TTI, summarizes the development of link-based on-road mobile source inventories utilizing MOBILE6 in the 8-County Houston/Galveston nonattainment area for the 2007 future case projection of the August 22 - September 1, 2000 ozone episode. A discussion of the MOBILE6 55 mph speed limit benefits for 2007 is included in the report. (March 2002)

Houston Area School Year VMT Estimates and Adjustments for Episode Analyses - This report, developed through a work order with TTI, documents development of VMT adjustment factors and VMT estimates for school and non-school ozone exceedence episode days of 1998, 2000, and 2007 for the Houston-Galveston Ozone Nonattainment Area. (August 2002)

Supplemental Vehicle Classification Data Collection and Analysis for the Houston Area - This report, developed through a work order with TTI, documents the activities associated with deployment of vehicle classification count data collectors to obtain updated weekday, Friday, Saturday, and Sunday field data for the Houston-Galveston ozone nonattainment area. This phase of the project includes data collection in July and August of 2002. Some analysis of the data has been completed and is included in this report. However, since September data is required to complete this project, and since the TCEQ fiscal year ends in August, complete data collection and updated vehicle miles of travel (VMT) mixes were developed when the project was completed under a second phase beginning September 2002. (August 2002)

2000 On-Road Mobile Source Episode Specific Emissions Inventories for the Houston-Galveston Ozone Nonattainment Area - This report, developed through a work order with TTI, summarizes the development of link-based on-road mobile source inventories utilizing MOBILE6 in the 8-County Houston/Galveston nonattainment area from August 22 - September 1, 2000. (March 2002)

Area and Mobile Source Emission Inventory Technical Support Project: 1990 - 2010 Emission Inventory Trends and Projections - This report, developed through a work order with Environ International, documents development of an update to the 1999 area, nOn-Road and biogenic emission inventories and development of 1990 to 2010 trend/projected inventories for On-Road, nOn-Road and area sources. All the inventories include VOCs, NOx, CO, SO2, and particulate matter (both PM10 and PM 2.5). The trend inventories include development of 1990 to 2010 annual and ozone season day emission trends and projections for all area, on-road mobile, and nOn-Road mobile sources. (August 2001)

TexAQS On-Road Mobile Source Emissions Estimation - This report, developed through a work order with TTI, summarizes the development of link-based on-road mobile source inventories utilizing MOBILE5b in the 8-County Houston/Galveston nonattainment area from August 15 - September 7, 2000. (August 2001)

1990 - 2010 On-Road Emission Trends Inventory Support for ENVIRON - This Technical Note, developed through a work order with TTI, documents development of On-Road mobile activity inputs required for inventory development, for analysis year 1990 to 2010, for each Texas county. This work was done to support development of MOBILE6 (pre-release version) based On-Road mobile trend emission inventories for every Texas county from 1990 to 2010. The activity measures documented include: annual VMT, seasonal adjustment factors, summer VMT, winter VMT and VMT mix. The emission inventories are available in a separate report. (July 2001)

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