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.
2008 Summer Fuel Field Study - This report and
zipped data files
(help with zipped files), 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)
Staff Contact: Morris Brown: 512/239-1438 or
e-mail: aqp@tceq.state.tx.us and put "Attn: Morris Brown" in the
subject line.
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)
Staff Contact: Call Chris Kite at 512/239-1959 or e-mail
us at aqp@tceq.state.tx.us and put
“Attn: Chris Kite, TTI Report Comment” in the subject
line.
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)
Staff Contact: Peter Ogbeide: 512/239-1937 or
e-mail: aqp@tceq.state.tx.us and put
“Attn: Peter Ogbeide” in the subject line.
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)
Staff Contact: Call Chris Kite at 512/239-1959 or e-mail
us at aqp@tceq.state.tx.us and put
“Attn: Chris Kite, TTI Report Comment” in the subject
line.
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)
Staff Contact: Call Chris Kite at 512/239-1959 or e-mail
us at aqp@tceq.state.tx.us and put
“Attn: Chris Kite, TTI Report Comment” in the subject
line.
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)
Staff Contact: Call Mary McGarry-Barber at 512/239-1987
or e-mail us at aqp@tceq.state.tx.us and put
“Attn: Mary McGarry-Barber” in the subject line.
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)
Staff Contact: Call Mary McGarry-Barber at 512/239-1987
or e-mail us at aqp@tceq.state.tx.us and put
“Attn: Mary McGarry-Barber” in the subject line.
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)
Staff Contact: Call Mary McGarry-Barber at 512/239-1987
or e-mail us at aqp@tceq.state.tx.us and put
“Attn: Mary McGarry-Barber” in the subject line.
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)
Staff Contact: Call Mary McGarry-Barber at 512/239-1987
or e-mail us at aqp@tceq.state.tx.us and put
“Attn: Mary McGarry-Barber” in the subject line.
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)
Staff Contact: Call Mary McGarry-Barber at 512/239-1987
or e-mail us at aqp@tceq.state.tx.us and put
“Attn: Mary McGarry-Barber” in the subject line.
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)
Staff Contact: Call Mary McGarry-Barber at 512/239-1987
or e-mail us at aqp@tceq.state.tx.us and put
“Attn: Mary McGarry-Barber” in the subject line.
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)
Staff Contact: Call Mary McGarry-Barber at 512/239-1987
or e-mail us at aqp@tceq.state.tx.us and put
“Attn: Mary McGarry-Barber” in the subject line.
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)
Staff Contact: Call Peter Ogbeide at 512/239-1937 or
e-mail us at aqp@tceq.state.tx.us and put
“Attn: Peter Ogbeide” in the subject line.
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).
Staff Contact: Call Peter Ogbeide at 512/239-1937 or
e-mail us at aqp@tceq.state.tx.us and put
“Attn: Peter Ogbeide” in the subject line.
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)
Staff Contact: Call Chris Kite at 512/239-1959 or e-mail
us at aqp@tceq.state.tx.us and put
“Attn: Chris Kite” in the subject line.
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)
Staff Contact: Call Chris Kite at 512/239-1959 or e-mail
us at aqp@tceq.state.tx.us and put
“Attn: Chris Kite” in the subject line.
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)
Staff Contact: Call Chris Kite at 512/239-1959 or e-mail
us at aqp@tceq.state.tx.us and put
“Attn: Chris Kite” in the subject line.
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)
Staff Contact: Call Chris Kite at 512/239-1959 or e-mail
us at aqp@tceq.state.tx.us and put
“Attn: Chris Kite” in the subject line.
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)
Staff Contact: Call Chris Kite at 512/239-1959 or e-mail
us at aqp@tceq.state.tx.us and put
“Attn: Chris Kite” in the subject line.
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)
Staff Contact: Call Chris Kite at 512/239-1959 or e-mail
us at aqp@tceq.state.tx.us and put
“Attn: Chris Kite” in the subject line.
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