HomeMy WebLinkAboutDAQ-2025-000775DRAFT
Technical Support Document
On-road Mobile Sources
Ozone Projection Inventory:
2026 May-August
June 2024
Utah Division of Air Quality
Inventory Section
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Abstract
This report discusses the on-road mobile source section of the Ozone SIP episodic inventory for the domain comprising all 29 counties within the state of Utah. The on-road mobile source episodic inventories were developed utilizing Environmental Protection Agency’s (EPA) emission software for on-road mobile sources: Motor Vehicle
Emissions Simulator (MOVES4). Inventories were created for an average episode Weekday and Weekend based on monthly 24 hour temperatures and relative humidity recorded 2017 May 1st – August 31st. Multiple local and state agencies provided key activity inputs for the 2026 projection on-road inventory: Utah Department of Transportation (UDOT) and local Metropolitan Planning
Organizations (MPOs) provided key transportation inputs: Vehicle Miles of Travel (VMT), VMT seasonal adjustment factors, VMT travel mix factors (fractions of vehicles traveling on network roads), and network speed profiles. Utah Division of Air Quality (UDAQ) provided vehicle fleet profiles: age, fuel type, and vehicle counts. Where required, local county health departments provided vehicle inspection and maintenance (I/M) testing procedures and results covering applicable and required vehicles. EPA provided local fuel profiles and specifications.
Summary on-road emissions inventory tables for a representative summer weekday are located at the end of the TSD: 2026 May-August.
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3.e.ii) ON-ROAD MOBILE SOURCES OZONE EMISSIONS INVENTORIES
i. Table of Contents……………………………………………………………………........... 3
ii. Glossary of Acronyms…………………………………………………………………….. 4
iii. Overview………………………………………………………………………................. 5
iv. MOVES4 Modeling Procedure............................................................................................ 6
v. Review Methodology……………………………………………………………………… 12
vi. Stage II Refueling, spillage controls……...……………………………………………… 12
vii. Speciation Runs…………………………………………………………………...…….. 13
v. Appendix: On-road 2026 Baseline Ozone emission inventories.......................................... 22
vi. References………………………………………………………..…................................. 22
LIST OF TABLES
Table 1. Utah I/M Programs……………………………………....………..................................................................11
Table 2. MOVES4 Regulatory Classification Mapping……………………………………………………………...14 Table 3. On-road Mobile Sources May 2026 Episodic Summertime Ozone emissions
inventory representing: Summer Weekday Emissions (Tons per Summer Weekday)………………………………………………………………………………………...15
Table 4. On-road Mobile Sources June 2026 Episodic Summertime Ozone emissions inventory representing: Summer Weekday Emissions (Tons per Summer Weekday)………………………………………………………………………………………...15
Table 5. On-road Mobile Sources July 2026 Episodic Summertime Ozone emissions inventory representing: Summer Weekday Emissions (Tons per Summer Weekday)………………………………………………………………………………………...16
Table 6. On-road Mobile Sources August 2026 Episodic Summertime Ozone emissions inventory representing: Summer Weekday Emissions
(Tons per Summer Weekday)…………………………………………………………………………………….…..16 Table 7. On-road Mobile Sources Summertime 2026 May Episodic Ozone emissions
inventory representing: Summer Weekday Emissions
(Tons per Summer Weekday) by County……..……………………………………………………………...………17 Table 8. On-road Mobile Sources Summertime 2026 June Episodic Ozone emissions
inventory representing: Summer Weekday Emissions (Tons per Summer Weekday) by County…………………………………………..…………………….……...….18
Table 9. On-road Mobile Sources Summertime 2026 July Episodic Ozone emissions
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inventory representing: Summer Weekday Emissions (Tons per Summer Weekday) by County……………………………………………...…………………………....19
Table 10. On-road Mobile Sources Summertime 2026 August Episodic Ozone emissions inventory representing: Summer Weekday Emissions (Tons per Summer Weekday) by County………………………………………………………...……………..….20
Table 11. On-road Mobile Sources Summertime 2026 May Projection Ozone emissions inventory representing:
Summer Weekday Emissions (Tons per Summer Weekday) by County, VOC Gasoline Refueling Emissions………………………………………………………………………………….21
Table 12. On-road Mobile Sources Summertime 2026 June Projection Ozone emissions inventory representing:
Summer Weekday Emissions (Tons per Summer Weekday) by County, VOC Gasoline Refueling Emissions……………………………...…………………………………………………..21
Table 13. On-road Mobile Sources Summertime 2026 July Projection Ozone emissions inventory representing: Summer Weekday Emissions (Tons per Summer Weekday) by County, VOC Gasoline Refueling Emissions…………………………...……………………………………………………..21
Table 14. On-road Mobile Sources Summertime 2026 August Projection Ozone emissions inventory representing: Summer Weekday Emissions (Tons per Summer Weekday) by County,
VOC Gasoline Refueling Emission…………………………………………………………………………………..21
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ii. Glossary of Acronyms:
Alternative Vehicle and Fuels & Technology (AVFT)
Average Annual Daily Traffic (AADT)
County Data Manager (CDM)
Environmental Protection Agency (EPA)
Gross Vehicle Weight Rating (GVWR)
Highway Performance Management System (HPMS)
Inspection/Maintenance (I/M)
Mountainland Association of Governments (MAG)
MOVES4 (Motor Vehicle Emission Simulator)
Nonattainment Area (NA)
On-Board Diagnostics (OBD)
Two Speed Idle (TSI)
Utah (UT)
Utah Department of Transportation (UDOT)
Utah Division of Air Quality (UDAQ)
Utah Division of Motor Vehicles (UDMV)
Vehicle Hours Traveled (VHT)
Vehicle Miles Traveled (VMT)
Wasatch Front Regional Council (WFRC)
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iii. Overview
The purpose of this document is to explain what emissions modeling assumptions were used to
develop the on-road mobile source Ozone SIP projection inventories for 2026 May 1st – August
31st. The inventory covers all 29 counties within the state of Utah including the Northern
Wasatch Front, Utah (UT), Non-Attainment Area (NA).
Multiple agencies constructed the episodic inventory for on-road mobile sources at the county
level for the whole state of Utah.
Wasatch Front Regional Council (WFRC) Metropolitan Planning Organization (MPO) provided
emission estimates for the Northern Wasatch Front UT, NA covering Davis, Salt Lake, Tooele,
and Weber counties including portions of those counties outside the NA. In addition, WFRC
provided emission estimates for Box Elder County, also outside the NA.
Mountainland Association of Governments (MAG) MPO provided modeling for Utah County
outside the NA.
Utah Division of Air Quality (UDAQ) and Utah Department of Transportation (UDOT) provided
modeling for rural counties outside the NA: Beaver, Cache, Carbon, Daggett, Emery, Garfield,
Grand, Iron, Juab, Kane, Millard, Morgan, Piute, Rich, San Juan, Sanpete, Sevier, Summit,
Wasatch, Washington, and Wayne.
Emission estimates are confined to the Environmental Protection Agency (EPA) approved Motor
Vehicle Emissions Simulator (MOVES4 4.0.1-movesdb20240104). This model produces daily
emissions estimates for on-road vehicles for a specific weekday or weekend for a given month.
MOVES4 modeling of vehicle activity inputs include: VMT (by month, weekday, and
weekend), vehicle type factors, vehicle population, network speeds, vehicle age profiles, I/M
profiles, fuel profiles and specifications, and meteorological conditions.
The MOVES4 model is run with the local activity data and is matched up with the appropriate
emission factors. The emissions factors within the model are determined by EPA using vehicle
specific test data matching existing Federal Emissions Standards. On-road emissions estimates
are broken into specific categories covering: starts, exhaust (idle and running), evaporative and
hot soak conditions.
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iv. MOVES4 Modeling Procedure
The discussion below identifies the procedures followed to model the episodic inventories.
1. MOVES4
The EPA MOVES4 model was used to produce on-road emissions estimates for an
average weekday and weekend in May, June, July, and August.
2. MOVES4 Daily Pollutants
Primary emission estimates included within the analysis:
● Ammonia (NH3)
● Carbon Monoxide (CO)
● Oxides of Nitrogen (NOx)
● PM2.5 Exhaust (PM25_Ex)
● Volatile Organic Compounds (VOC)
3. MOVE4 Local Model Inputs
(a) County Data Manager Development
MOVES4 organizes data inputs into databases called County Data Manager (CDM) tables. CDMs were developed for 29 counties for the year 2026: average weekday and
weekend.
(1) Transportation Inputs: Average Speed Distribution, VMT, VMT factors, VMT
mix, and Road Distribution: UDOT and MPOs (MAG & WFRC)
WFRC and MAG obtained 2026 VMT estimates from their respective travel
demand models, and from the Utah State travel demand model. Monthly factors
for weekdays and weekends for May, June, July, and August were applied to
create the desired VMT estimates for each month and day to be modeled.
Vehicle type percentages based on counts from UDOT for light duty and heavy
duty vehicles, were expanded to thirteen vehicle types using default proportions
in the MOVES4 model. These vehicle percentages were then used to
disaggregate the total daily VMT by vehicle type. For WFRC, local data for
transit buses and school buses were used in place of default values.
Travel demand models were used to define the VMT distribution by road type
and vehicle type, as well as detailed speed profiles. The WFRC model was used
for Salt Lake and Davis Counties. The Utah State Travel Model (USTM) was
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used for Weber, Tooele, and Box Elder Counties because the WFRC model does
not cover the entirety of these counties.
WFRC developed the TDM2MOVES_mysql application for the purpose of
extracting needed inputs for the MOVES4 model from the travel demand model.
MOVES4 input files for road type distribution, speed profile, and VMT by
vehicle type were generated using this application.
VMT estimates from WFRC for 2026 were adjusted in two ways. First, to
reflect development of the Utah Inland Port Authority, VMT estimates for
"HPMSvtype" 50's and 60's (single unit and combination trucks) were increased
15% and 30% respectively. Correspondingly, the populations for long-haul
vehicle types 53 and 62 were increased by 15% and 30% respectively. Second,
the VMT estimate for all other vehicle types was increased by 5% to allow for
latent demand in reported HPMS VMT during the COVID-19 years, increased
estimates of emissions in the future when modeling the same years with the new
MOVES5 model, and other uncertainties within the 2017-2026 time span of the
analysis.
UDOT used the travel demand models across the state to estimate 2026 weekday
and weekend monthly VMT. These travel demand models produce spring/fall
weekday VMT, therefore UDOT utilized monthly/weekend factors to convert
spring/fall weekday VMT to July weekday and weekend VMT. Vehicle type
percentages based on counts from UDOT for light duty and heavy duty vehicles,
were expanded to thirteen vehicle types using default proportions in the
MOVES4 model. These vehicle percentages were then used to disaggregate the
total daily VMT by vehicle type.
(2) 2026 Age Distribution and Source Type Population
Age and source type populations are constructed for 31 model years for all
vehicle types. 2023 Utah DMV data contains registrations with an expiration of
January 1, 2023 or greater as of February 15, 2023. 2023 model years are added
to 2022 model years. This is done because there are not that many 2023 model
years and car manufactures have model years available for sale before the actual
year has occurred, some car manufacturers sell model years early for customers as
a selling point. UDAQ includes 2023 model year vehicles to account for their
vehicle starts emissions, even though they do not ‘fit’ exactly within the model
year inputs available for MOVES4. After the initial first year, individual model
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years are represented by their respective model year until the 31st year. The last
year, 1992, is compiled by combining model years 1992-1969.
DMV data is compiled by the following vehicle type: passenger cars, light duty
trucks, and heavy trucks. Registered vehicles are categorized by usage: farm,
motorhome, and truck standard: sorted by 14 GVWR (Gross Vehicle Weight
Rating) categories. Farm trucks and truck standard data sets are combined
together by weight categories. Motorhomes include vehicles that weigh >=
14,000 GVWR. DMV passenger car and light duty truck data sets are combined
initially via HPMS classifications, with MOVES4 default fractions being utilized
to determine the percentage of passenger cars and light duty trucks.
The state vehicle DMV data is matched with MOVES4 mapping of vehicles using
MOVES4 Regulatory Classifications to Highway Performance Monitoring
System to MOVES4 source types (see Table 2).
Age and Population vehicle profile adjustments were made to account for heavy
trucks operating out of state. Adjusted vehicles include: Source Type 53 Single
Unit Long Haul Trucks and Source Type 62 Combination Long Haul Trucks.
National Default Age distributions were used for these vehicles. Vehicle
populations are based on using a population/VMT ratio equation. The equation
used is the following: UDMV Population/MOVES4 default VMT * Travel
Demand Model VMT. This ratio is used to calculate new vehicle population for
source types 53 and 62, accounting for out of state trucks. MOVES4 default age
profiles are used for source types 53 and 62. To be conservative, WFRC utilized
DMV registration data for heavy duty truck age profiles.
Age and population projection estimates are based upon the following: Age
distributions are projected utilizing EPA’s MOVES4 age distribution tool.
Population projections are based upon EPA’s MOVE4 population county specific
growth rates.
Past methodologies included using DMV counts only for passenger cars and light
duty trucks. MOVES4 default fractions were used to determine the fraction of
passenger cars and light duty trucks. Passenger cars and light duty trucks utilized
the same age profile. To account for heavy duty vehicle counts, default MOVES4
vehicle profiles were used. The heavy duty truck default profiles were adjusted
by DMV data by passenger car and light duty truck data. MOVES4 default age
distributions were used for heavy duty trucks. Age profiles for counties were held
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constant and not projected. Population growth rates were based upon MOVE4
default growth rates.
(3) AVFT (Alternative Vehicle and Fuels & Technology: Electric, Diesel and
Gasoline Vehicle Fractions)
2026 AVFT profiles were created using the following data and methods. 2023
Utah DMV data includes registration of vehicles by fuel type. The data available
includes fleet data for the whole year and is not available by specific model year.
The data used for the AVFT profile covers passenger cars and light duty trucks up
to 12,000 GVWR. Default AVFT profiles were used for heavy duty vehicles as
these vehicles mainly consist of out of state trucks.
The annual DMV data was adjusted in multiple ways: MOVES4 default
passenger car and light duty truck fractions were utilized to adjust the percentage
of passenger cars and light duty trucks and their associated fuel fractions.
MOVES4 runs were constructed with DMV age and population inputs along with
the EPA default AVFT profile. The modeling results provided output to construct
an annual default AVFT profile for passenger cars and light duty trucks. The
default AVFT profile was adjusted to match the annual DMV registration fuel
type fractions. MPO counties have specific AVFT profiles and rural counties
were combined to create a single AVFT profile. Rural counties were combined to
reduce computational time as they have similar fleet characteristics.
AVFT Projections are based upon the output from the MOVES4 internal AVFT
projection tool. The projection method utilized included the proportional
projection method.
Past methodologies include using DMV data for passenger cars and light duty
trucks. MOVE3 default passenger car and light duty truck fractions were utilized
to adjust the percentage of passenger cars and light duty trucks and their
associated fuel fractions. Annual DMV data was applied as a model year with
multiple annual DMV datasets being used. The last year was held constant for
future projection years.
(4) Fuel
MOVES4 default fuel parameters were used for all fuel types.
Past methodologies utilized MOVES4 default fuel types.
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(5) Hour VMT Fraction
MOVES4 default Hour VMT Fraction values were used.
Past methodologies utilized MOVES4 default Hour VMT Fractions.
(6) I/M Coverage: Cache, Davis, Salt Lake, Utah, and Weber Counties
UDAQ constructed I/M programs in consultation with the local county health
departments in Cache, Davis, Salt Lake, Utah, and Weber Counties. In 2026,
MOVES4 does not provide I/M emissions credit for vehicles older than 1996, as
the model only provides emission estimates for 31 model years.
Vehicles newer than 1996 undergo On-Board Diagnostic Testing (OBD). Heavy
Duty Trucks did not have OBD capability until 2008. Davis, Salt Lake, Utah and
Weber Counties I/M programs exempt the first two model years, biennially test
the third through sixth model years, and perform an annual test on the remaining
vehicles. The Cache County I/M program exempt the first six model years and
performs a biennial test. Below is a summary covering I/M programs in 2026.
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(7) Zone Month Hour (Meteorological Data)
The UDAQ Technical Analysis Section provided meteorological conditions from
the MesoWest archives. MesoWest (mesowest.utah.edu) is a database of current
and archived meteorological data from weather stations in the United States
maintained by the University of Utah.
2017 May 1st – August 31st
Meteorological data was identified by locating the largest population center for
each county. Then the nearest weather station was acquired from the MesoWest
data archives. Since ozone events along the Wasatch Front occur sporadically
throughout the summertime, the following representative months were used: May,
June, July and August.
v. Review Methodology
Multiple quality assurance and quality control methodologies are utilized to ensure that
the correct inputs are utilized to create the on-road mobile inventory. Checks are
instituted along several steps of creating the inventory. The type of checks being used
extend from text file comparisons, built in Excel checks, MySQL scripts comparing
inputs to main input databases, comparing default MOVES4 inputs and output emissions,
and comparing past emissions inventories. Specific error checking results are stored
within workbooks and or shared with submitting agencies to ensure file completeness.
vi. Stage II Refueling: spillage controls
According to Utah State Rule, R307-328: Gasoline Transfer and Storage, DAQ will have
spillage controls in place in 2026 for Davis, Salt Lake, Tooele, Utah, and Weber
Counties. The spillage controls include the adoption of no drip refueling nozzles.
MOVES4 allows for Stage II refueling spillage credits to be used within the County Year
Table in the refueling spill program adjust column.
The spillage credit is calculated using the following inputs:
Percentage difference between:
Uncontrolled Refueling Spillage = 0.7 lb/1000 gallons throughput
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Controlled Refueling Spillage = 0.05 lb/1000 gallons throughput
= 92.857% reduction.
vii. Speciation Runs:
On-road mobile VOC speciation runs for Salt Lake County were created to assist the
modeling section in creating ozone speciation profiles. The total emissions created from
these profile runs are no different than the one utilized in airshed modeling. The main
difference is that the output being used in the speciation profile is quantified by model
year.
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Table 7. On-road Mobile Sources Summertime 2026 May Projection Ozone emissions inventory representing:
Summer Weekday Emissions (Tons per Summer Weekday) by County
County CO NOx VOC VOC Refuel NH3 PM2.5 Exhaust VMT
Beaver 3.80 1.03 0.14 0.04 0.06 0.02 1,006,515
Cache 20.92 2.86 1.14 0.25 0.38 0.08 7,438,664
Carbon 3.30 0.90 0.23 0.04 0.05 0.02 953,624
Daggett 0.34 0.09 0.02 0.00 0.01 0.00 100,765
Duchesne 3.77 0.98 0.25 0.05 0.06 0.02 1,077,002
Emery 4.27 1.46 0.19 0.06 0.07 0.03 1,282,485
Garfield 1.68 0.42 0.10 0.02 0.03 0.01 514,868
Grand 5.97 1.85 0.22 0.08 0.09 0.04 1,639,911
Iron 18.53 4.45 0.71 0.21 0.27 0.09 5,192,504
Juab 5.70 1.23 0.21 0.06 0.08 0.03 1,530,205
Kane 1.98 0.47 0.12 0.03 0.03 0.01 624,654
Millard 7.28 2.10 0.27 0.09 0.11 0.04 2,004,676
Morgan 1.82 0.34 0.12 0.02 0.03 0.01 598,536
Piute 0.41 0.13 0.03 0.01 0.01 0.00 113,367
Rich 0.58 0.10 0.04 0.01 0.01 0.00 184,886
San Juan 3.14 0.97 0.16 0.05 0.06 0.02 1,075,616
Sanpete 3.74 0.84 0.30 0.04 0.05 0.02 899,979
Sevier 4.83 1.29 0.26 0.06 0.07 0.03 1,281,194
Summit 13.61 4.48 0.62 0.19 0.27 0.09 5,548,375
Uintah 4.56 1.15 0.33 0.05 0.07 0.03 1,229,707
Wasatch 7.79 1.66 0.39 0.10 0.14 0.04 3,045,074
Washington 54.24 8.75 2.10 0.59 0.71 0.19 14,579,838
Wayne 0.78 0.18 0.05 0.01 0.01 0.01 228,266
Box Elder 16.52 3.78 0.74 0.18 0.24 0.10 4,819,917
Davis 32.52 4.49 1.88 0.33 0.55 0.12 11,451,235
Salt Lake 99.30 13.77 5.99 1.01 1.71 0.35 36,647,866
Tooele 11.62 2.92 0.67 0.13 0.18 0.07 3,451,149
Weber 19.42 2.81 1.39 0.21 0.31 0.08 6,310,023
Utah 51.37 7.25 3.01 0.58 0.87 0.17 18,246,191
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Table 8. On-road Mobile Sources Summertime 2026 June Projection Ozone emissions inventory representing:
Summer Weekday Emissions (Tons per Summer Weekday) by County
County CO NOx VOC VOC Refuel NH3
PM2.5
Exhaust VMT
Beaver 4.99 1.18 0.15 0.06 0.06 0.02 1,092,395
Cache 25.37 3.09 1.21 0.31 0.39 0.08 7,757,045
Carbon 4.07 0.99 0.26 0.06 0.05 0.02 1,013,149
Daggett 0.52 0.13 0.03 0.01 0.01 0.00 135,649
Duchesne 4.65 1.07 0.28 0.06 0.06 0.02 1,155,678
Emery 5.75 1.66 0.22 0.08 0.08 0.03 1,437,964
Garfield 2.26 0.50 0.11 0.03 0.03 0.01 571,260
Grand 7.72 2.04 0.25 0.10 0.10 0.04 1,716,267
Iron 24.05 5.03 0.79 0.27 0.29 0.10 5,551,567
Juab 7.40 1.38 0.23 0.08 0.09 0.03 1,658,145
Kane 2.59 0.55 0.14 0.04 0.03 0.01 677,862
Millard 9.50 2.37 0.30 0.11 0.12 0.05 2,164,066
Morgan 2.28 0.39 0.13 0.03 0.03 0.01 687,201
Piute 0.53 0.16 0.03 0.01 0.01 0.00 127,833
Rich 0.94 0.16 0.05 0.01 0.01 0.01 301,318
San Juan 4.13 1.11 0.18 0.06 0.06 0.02 1,165,727
Sanpete 4.66 0.95 0.34 0.05 0.05 0.02 973,556
Sevier 6.17 1.48 0.29 0.08 0.08 0.03 1,424,055
Summit 17.64 5.45 0.69 0.27 0.33 0.11 6,765,093
Uintah 5.61 1.26 0.36 0.07 0.07 0.03 1,308,969
Wasatch 10.76 2.07 0.45 0.14 0.17 0.05 3,733,977
Washingto
n 64.82 9.53 2.46 0.68 0.71 0.19 14,649,111
Wayne 1.03 0.21 0.06 0.01 0.01 0.01 258,735
Box Elder 38.65 4.25 0.81 0.22 0.26 0.10 5,238,357
Davis 38.65 4.56 1.98 0.39 0.56 0.11 11,648,066
Salt Lake 119.21 14.40 6.35 1.21 1.73 0.34 37,157,370
Tooele 14.17 3.16 0.72 0.16 0.19 0.08 3,654,263
Weber 22.75 2.97 1.47 0.25 0.32 0.08 6,461,074
Utah 61.17 7.50 3.22 0.69 0.89 0.17 18,668,135
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Table 9. On-road Mobile Sources Summertime 2026 July Projection Ozone emissions inventory representing:
Summer Weekday Emissions (Tons per Summer Weekday) by County
County CO NOx VOC VOC Refuel NH3
PM2.5
Exhaust VMT
Beaver 5.28 1.14 0.16 0.06 0.06 0.02 1,120,950
Cache 28.94 3.19 1.35 0.35 0.40 0.08 7,837,921
Carbon 4.25 0.95 0.26 0.06 0.05 0.02 1,016,139
Daggett 0.58 0.13 0.03 0.01 0.01 0.00 144,449
Duchesne 4.88 1.05 0.29 0.06 0.06 0.02 1,168,411
Emery 5.95 1.59 0.22 0.08 0.08 0.03 1,460,196
Garfield 2.46 0.47 0.12 0.03 0.03 0.01 585,076
Grand 7.83 1.83 0.25 0.10 0.09 0.04 1,680,841
Iron 25.22 4.75 0.80 0.28 0.30 0.10 5,649,491
Juab 8.18 1.35 0.24 0.09 0.09 0.03 1,700,162
Kane 2.66 0.51 0.14 0.04 0.03 0.01 696,664
Millard 10.43 2.35 0.32 0.12 0.12 0.05 2,209,684
Morgan 2.61 0.40 0.14 0.03 0.03 0.01 719,935
Piute 0.56 0.15 0.03 0.01 0.01 0.00 130,741
Rich 1.43 0.21 0.06 0.02 0.02 0.01 412,965
San Juan 4.24 1.04 0.18 0.06 0.06 0.02 1,190,984
Sanpete 4.90 0.92 0.35 0.06 0.05 0.02 984,553
Sevier 6.48 1.42 0.30 0.08 0.08 0.03 1,430,377
Summit 20.17 5.65 0.74 0.31 0.36 0.11 7,308,645
Uintah 5.95 1.23 0.38 0.07 0.07 0.03 1,316,573
Wasatch 11.69 2.06 0.48 0.15 0.17 0.05 3,824,862
Washingto
n 67.42 8.68 2.47 0.69 0.71 0.19 14,523,957
Wayne 1.07 0.20 0.06 0.01 0.01 0.01 264,744
Box Elder 24.06 4.48 0.89 0.26 0.27 0.11 5,427,871
Davis 43.12 4.44 2.20 0.42 0.55 0.11 11,455,823
Salt Lake 132.53 14.13 6.95 1.30 1.70 0.33 36,535,203
Tooele 16.04 3.17 0.79 0.18 0.19 0.08 3,688,206
Weber 25.39 3.00 1.66 0.28 0.31 0.08 6,388,069
Utah 66.66 7.26 3.43 0.75 0.88 0.17 18,444,847
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Table 10. On-road Mobile Sources Summertime 2026 August Projection Ozone emissions inventory representing:
Summer Weekday Emissions (Tons per Summer Weekday) by County
County CO NOx VOC VOC Refuel NH3
PM2.5
Exhaust VMT
Beaver 4.77 1.07 0.15 0.05 0.06 0.02 1,049,772
Cache 27.18 3.18 1.29 0.33 0.40 0.08 7,864,351
Carbon 4.01 0.94 0.25 0.05 0.05 0.02 1,002,589
Daggett 0.49 0.12 0.03 0.01 0.01 0.00 127,632
Duchesne 4.57 1.02 0.28 0.06 0.06 0.02 1,139,569
Emery 5.37 1.50 0.21 0.08 0.08 0.03 1,372,922
Garfield 2.23 0.43 0.11 0.03 0.03 0.01 531,845
Grand 6.77 1.71 0.23 0.09 0.09 0.03 1,530,598
Iron 23.24 4.55 0.78 0.26 0.29 0.10 5,433,001
Juab 7.20 1.27 0.23 0.08 0.09 0.03 1,601,911
Kane 2.39 0.48 0.13 0.03 0.03 0.01 645,101
Millard 9.39 2.21 0.30 0.11 0.12 0.04 2,088,122
Morgan 2.43 0.40 0.13 0.03 0.03 0.01 698,212
Piute 0.49 0.14 0.03 0.01 0.01 0.00 117,616
Rich 1.19 0.19 0.06 0.01 0.02 0.01 360,072
San Juan 3.75 0.97 0.16 0.05 0.06 0.02 1,094,638
Sanpete 4.58 0.90 0.33 0.05 0.05 0.02 957,906
Sevier 5.81 1.33 0.29 0.07 0.08 0.03 1,346,555
Summit 19.10 5.64 0.73 0.29 0.35 0.11 7,083,570
Uintah 5.51 1.20 0.36 0.07 0.07 0.03 1,290,472
Wasatch 11.05 2.04 0.46 0.14 0.17 0.05 3,740,730
Washingto
n 60.65 8.08 2.31 0.63 0.66 0.18 13,655,814
Wayne 0.94 0.19 0.05 0.01 0.01 0.01 237,323
Box Elder 22.18 4.33 0.85 0.24 0.27 0.11 5,273,922
Davis 41.15 4.55 2.13 0.41 0.56 0.11 11,648,208
Salt Lake 127.27 14.41 6.67 1.28 1.73 0.34 37,243,244
Tooele 15.10 3.18 0.76 0.17 0.19 0.08 3,685,601
Weber 24.23 3.02 1.57 0.27 0.32 0.08 6,465,045
Utah 63.62 7.34 3.36 0.71 0.89 0.17 18,627,018
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3.e.ii - 22
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v. Appendix: On-road 2026 Projection Ozone emissions inventories
Input files will be furnished upon request.
vi. References
The following documents were used as references in creating the on-road mobile source Ozone
SIP emissions inventories:
1. U.S. Environmental Protection Agency, Office of Transportation and Air Quality, "MOVES4
Technical Guidance: Using MOVES to Prepare Emission Inventories for State Implementation
Plans and Transportation Conformity", EPA-420-B-23-011 August 2023,
https://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=P101862T.pdf
2. I/M Programs
a. Davis County Health Department, Environmental Health Services Division, Davis County
Testing Center, 20 North 600 West, Kaysville, UT 84037, 801-546-8860.
b. Salt Lake County Health Department, Environmental Health, Air Pollution Control, I/M Tech
Center, 788 East Woodoak Lane (5380 South), Murray, UT 84107-6369, 385-468-4837.
c. Utah County Health Department, Utah County Environment Health, Bureau of Air Quality,
I/M Tech Center, 3255 North Main Street, Spanish Fork, UT, 84660, 801-851-7600.
d. Weber-Morgan Health Department, Environmental Health, 477 23rd Street, 2nd floor, Ogden,
UT 84401, 801-399-7160.
e. Bear River Health Department, 655 East 1300 North. Logan, UT 84341, 801-792-6500
3. MESOWEST Utah, (meteorological data archive), University of Utah, Department of
Atmospheric Sciences, http://mesowest.utah.edu/
3.e.ii - 23