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DRAFT TECHNICAL MEMORANDUM

To: Thomas Moore and Lee Gribovicz, WRAP 

From: John Grant, Alison Pollack, and Allison DenBleyker 

Date: March 3, 2009 

Subject: WRAP PRP18b NONROAD model equipment emissions assessment 

INTRODUCTION 

ENVIRON has been asked to review for potential update all on-road and off-road mobile source 

emissions estimates for use in the 2018 PRP18b air quality modeling. ENVIRON originally 

developed a comprehensive mobile source emission inventory, including emissions from on-road 

vehicles, off-road equipment, locomotives, commercial marine vessels, and aircraft, in 20051

. 

This memo addresses the emissions effects of two recently promulgated standards for nonroad 

engines, as well as emissions effects from updates to the EPA NONROAD model since the 2005 

mobile source emissions estimates were prepared. 

The 2005 WRAP off-road equipment emissions estimates1 were generated with an older version 

of EPA’s NONROAD model, version NONROAD2004. Since that time, EPA has updated the 

model with new input data and revised emissions calculations, and released a model for air 

quality planners to use; this version is called NONROAD2005a and is the version currently 

available on EPA’s NONROAD modeling web page (http://www.epa.gov/otaq/nonrdmdl.htm). 

As part of their most recent rulemaking, EPA has also prepared an updated version of the model, 

NONROAD2005d, that is in the rulemaking docket but is not available on EPA’s web page. 

ENVIRON has generated 2018 off-road equipment emission estimates for select areas using 

EPA’s NONROAD model, versions NONROAD2005a and NONROAD2005d, and compared 

these results to the previous WRAP off-road equipment emissions estimates generated with the 

NONROAD2004 version. Based upon this comparison, ENVIRON has estimated the changes in 

emissions resulting from the use of the most recent EPA NONROAD model and evaluated the 

significance of the changes in the context of the overall WRAP emission inventory. Results of 

that analysis are provided below, first for EPA’s model update and then for updates to account 

for the latest rulemaking, along with our recommendations on what to use in PRP18b modeling. 

 

EPA NONROAD2005A MODEL UPDATE 

For off-road equipment emissions previously generated by ENVIRON1

, the latest model at the 

time was EPA’s draft NONROAD2004. In February 2006, EPA released the “final” 

NONROAD2005a model. There were a number of changes made by the EPA in the 

 

1

 Pollack, A.K., L. Chan, P. Chandraker, J. Grant, C. Lindhjem, S. Rao, J. Russell, C. Tran. 2006. “WRAP MOBILE Source Emission 

Inventories Update.” Prepared for Western Governors’ Association, Denver, CO. May. 
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NONROAD2005a model from the draft NONROAD2004 model. The most important changes 

were: 

 New evaporative emissions for tank permeation, hose permeation, hot soak, and running 

loss emissions; 

 Revision of diurnal emissions calculations; 

 Revision of equipment population growth factors; and

 Update of equipment population allocation files based on the latest U.S. Census County 

Business Patterns data.

With these and other more minor updates, emissions estimates changed for all pollutants and 

most source categories. ENVIRON compared emission results generated by the older draft 

NONROAD2004 model and the NONROAD2005a model in the following five geographical 

areas: 

 The entire state of Arizona to evaluate statewide effects; 

 Maricopa and Pinal Counties in Arizona to evaluate effects in urban counties; 

 Garfield County, in Colorado, in order to evaluate effects in a rural county with 

significant oil and gas activities and a major road, I70, through it; and 

 Sublette County, in Wyoming, to evaluate effects in a rural county without a major road 

through it. 

These model runs were all made for summer 2018, as the largest effects of the model changes 

were expected in the summer season when temperatures are highest and activity is typically 

highest. 

Changes to the draft NONROAD2004 model to create the NONROAD2005a model affect the 

WRAP inventory emissions with varying magnitudes by pollutant and geographic area. 

Emissions comparisons between NONROAD2004 and NONROAD2005a are presented in 

Appendix B for volatile organic compounds (VOC), carbon monoxide (CO), nitrogen oxides 

(NOx) and particulate matter (PM10 and PM2.5). 

Relative to the draft NONROAD2004 model, VOC emissions estimated with the 

NONROAD2005a model increased in four of the five geographical areas due to the addition of 

evaporative modes in the final model. The exception, Garfield County, showed emissions 

decreases across all pollutants, indicating that a VOC increase due to additional evaporative 

modes may have been offset by decreased equipment population resulting from updated Census 

data in the allocation data files. Pinal County also appears to have been affected by Census 

changes; emissions from the NONROAD2005a model showed large increases across all 

pollutants relative to the draft NONROAD2004 results. CO emissions changes were small (less 

than 2%) between model versions, with the exception of Garfield and Pinal Counties, where 

changes in population allocation were significant. 

Relative to the draft NONROAD2004 model, NOx emissions estimated with the 

NONROAD2005a model decreased by about 9% for both the state of Arizona and Maricopa 
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County. NOx increased by 40% for Pinal County, decreased by 19% in Garfield County, and 

increased by 10% in Sublette County. At the county level, a 40% increase could be significant; 

however, the Arizona statewide emissions show a more moderate 9% increase in NOx emissions. 

Relative to the draft NONROAD2004 model, PM10 and PM2.5 emissions estimated with the 

NONROAD2005a model increased negligibly for Maricopa County at 0.2% and 0.8%, 

respectively. There were also relatively small changes for the state of Arizona, with decreases of 

7.6% and 7% for PM10 and PM2.5, respectively. There were very large increases in particulate 

emissions for Pinal County just as there were for the other pollutants, with PM10 and PM2.5 up 

109% and 108%, respectively. Garfield County emissions decreased 29% and 28%, for PM10 

and PM2.5, respectively. 

While there were large changes to emissions from the draft NONROAD2004 model to the final 

2005 model for some counties (Pinal, Garfield), the differences between model versions are 

more moderate for the state of Arizona, in particular for pollutants of interest to visibility 

concerns. The state of Arizona exhibited modest decreases of NOx and PM2.5 emissions at 9% 

and 7%, respectively. 

NEW EPA REGULATIONS 

Subsequent to the release of the NONROAD2005a model, two standards were finalized for 

nonroad engines. These regulations are described below, along with emissions reductions 

expected from the new standards. 

Emissions Standards for Small SI Engines and Marine SI Engines 

In September 2008, EPA finalized regulations for new exhaust emissions standards for small SI 

engines and marine SI engines (http://www.epa.gov/OMS/regs/nonroad/marinesiequipld/420f08013.htm). The ruling covers SI engines rated less than 25 horsepower used in 

household and commercial applications. This is primarily lawn and garden equipment, but also 

includes a variety of other construction, farm, and industrial equipment. The rule also covers SI 

engines used recreational in marine vessels, including outboard engines, personal watercraft, and 

sterndrive/inboard engines. 

While there are significant emissions reductions for these engines, the contribution of these 

engines to the overall anthropogenic emission inventory is not large, so the overall percent 

reduction is small. The reductions (small and marine SI combined) shown in Table 1, projected 

for year 2020, are derived from EPA’s Regulatory Impact Analysis (RIA, available at 

http://www.epa.gov/OMS/equip-ld.htm): 

Table 1. Emission reductions to small spark ignition (SI) engines and marine SI engines. 

2020 Emissions Reductions VOC NOx PM10 

Reduction as percent of baseline small and marine SI engines 39% 38% 11% 

Reduction as percent of baseline total mobile sources 12.3% 1.8% 1.3% 

Reduction as percent of baseline total anthropogenic sources 3.9% 0.9% 0.1% 
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To estimate these reductions, EPA developed a modified version of their NONROAD model. 

The model version that is on EPA’s NONROAD web page is NONROAD2005a; EPA’s version 

NONROAD2005d was developed for this rule. The updated version of the model is not posted 

on the NONROAD web page, but is available in the rule docket (not electronically); ENVIRON 

obtained a copy directly from EPA’s Office of Transportation and Air Quality. 

ENVIRON used the same five scenarios as described above in the comparison of 

NONROAD2004 with NONROAD2005a to evaluate the effects on emissions of the new rule. 

We compared the NONROAD2005d model to the NONROAD2005a model for the five 

geographic areas to evaluate the estimated effects of the latest SI rule, and we also compared the 

NONROAD2005d model to the NONROAD2004 model in these areas to evaluate the combined 

effects of the model change and the SI rule. 

Changes in emissions between the NONROAD2005a model and the NONROAD2005d version 

are presented in Appendix B for each of the five geographic areas. The broad effect of the 

NONROAD2005d model was to decrease emissions of all pollutants. The largest decreases 

from the EPA ruling were for VOC and CO, as expected. Decreases ranged from 22% to 48% 

for VOC and 26% to 51% for CO. Decreases to NOx and PM were small or moderate for each 

of the five areas. Decreases of NOx emissions were 7% for Maricopa County, 11% for the state 

of Arizona, 1% for Pinal County, 7% for Garfield County, and 2% for Sublette County. PM2.5 

emissions decreased by 3.5% for Maricopa County, 9.2% for the state of Arizona, 3.1% for 

Garfield County, and 3.8% for Sublette County, while the increased by 0.4% for Pinal County. 

Changes to PM10 emissions were very similar to changes in PM2.5 emissions. 

Snowmobile Emissions Standards Rule 

In June 2008 there was a minor change to the snowmobiles emissions standards rule 

(http://www.epa.gov/otaq/recveh.htm). That action removed the Phase 3 NOx standards for the 

2012 and later model year snowmobiles in response to a court decision. This rule change is not

reflected in the NONROAD2005d model, nor has EPA implemented this rule in any version of 

the model (personal communication with Craig Harvey, EPA OTAQ). 

The effect on emissions of the recent change to snowmobile emission standards is to increase 

emissions for model year 2012 and later snowmobiles. Table 2 shows 2018 NOx emissions from 

snowmobiles in the current WRAP 2018 emission inventory (based on NONROAD2004). As 

shown for the winter season, when snowmobiles are most active, snowmobiles make up 4% of 

total off-road equipment emissions in the WRAP domain. As a fraction of total statewide offroad equipment emissions, snowmobiles contribute less than ten percent of winter off-road 

emissions in most states and a higher proportion of emissions in Alaska, Wyoming, and Idaho. 

Annually, snowmobiles contribute only 1% of all off-road equipment NOx emissions over the 

entire WRAP domain, and from 0% to 13% of off-road equipment NOx emissions by state. 

In NONROAD2005, snowmobiles have a median life of 252 hours at full load, which translates 

to a median life of 13 years at the NONROAD2005 default average load of 0.34 and default 

annual use of 57 hours per year. Per NONROAD2005 growth estimates, the snowmobile 

population is expected to grow by 17% from 2012 and 2018. Even with the 17% growth rate, 
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given the 13 year median life, a large fraction of the snowmobile population will be of model 

years prior to 2012 in calendar year 2018 and thus unaffected by the rescinding of NOx 

emissions standards beginning in model year 2012. 

Table 2. 2018 snowmobile NOx emissions in current WRAP inventory1. 

2018 NOx Emissions (tons per winter day) 

State 

Snowmobile 

Emissions 

Total Off-road 

Equipment 

Emissions 

Fraction of Off-road 

Equipment 

Emissions from 

Snowmobiles 

Winter 

Alaska 3.7 6.5 58% 

Arizona 0.7 28.7 2% 

California 1.0 296.3 0% 

Colorado 2.4 27.7 9% 

Idaho 2.4 13.2 18% 

Montana 1.0 11.2 9% 

Nevada 0.0 12.9 0% 

New Mexico 0.1 10.6 1% 

North Dakota 1.3 17.8 7% 

Oregon 1.1 22.8 5% 

South Dakota 1.1 16.9 6% 

Utah 1.6 23.4 7% 

Washington 1.8 32.7 6% 

Wyoming 2.3 7.5 30% 

Total 20.3 528.2 4% 

Annual

Alaska 0.9 7.2 13% 

Arizona 0.2 45.7 0% 

California 0.5 296.3 0% 

Colorado 0.6 60.0 1% 

Idaho 0.6 33.3 2% 

Montana 0.2 33.8 1% 

Nevada 0.0 22.6 0% 

New Mexico 0.0 19.2 0% 

North Dakota 0.3 60.7 1% 

Oregon 0.3 52.9 0% 

South Dakota 0.3 57.9 0% 

Utah 0.4 40.7 1% 

Washington 0.5 73.1 1% 

Wyoming 0.6 17.1 3% 

Total 5.3 820.5 1% 

New Source Performance Standards 

The New Source Performance Standard (NSPS) for stationary SI engines was promulgated in 

January 2009. This rulemaking does not apply to mobile sources, which are defined as being 

moved once per year or more. This rulemaking covers compressors and other oil and gas 

engines, and those reductions are being taken into account in the IPAMS/WRAP Phase III oil 

and gas emission inventory now being conducted by ENVIRON. 
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ANALYSIS AND RECOMMENDATIONS 

The cumulative effects of the change from the draft NONROAD2004 model to the 

NONROAD2005a model and the EPA rulemaking for new exhaust emissions standards for small 

SI engines and marine SI engines (NONROAD2005a to NONROAD2005d) are additive in some 

cases and have offsetting effects in others. All of the percent changes previously discussed are in 

the context of changes to total off-road equipment emissions. Appendix A shows the by-sector 

2018 (PRP18a) WRAP emissions inventoryError! Bookmark not defined., , and also shows the fraction of 

the overall inventory from NONROAD model sources. The net change in emissions from the 

use of the most recent NONROAD2005d model relative to the NONROAD2004 model used in 

the previous WRAP emission inventory1

 is placed into context of overall emissions in Table 3 

for each of the five geographical areas modeled. That table shows that NONROAD model 

equipment emissions are only 8.5% of total NOx emissions, 1.3% of total PM2.5 emissions, and 

0.1% of total SO2 emissions. Table 3 expresses the percent reductions for each of the five 

geographical areas seen in the changes form NONROAD2004 to NONROAD2005d as a 

function of the overall 2018 emission inventory as shown in Appendix A. As an example of the 

calculations, Maricopa County NOx emissions decreased 15.5% between NONROAD2004 and 

NONROAD2005d, and NONROAD equipment emissions contribute only 8.5% of all 2018 NOx 

emissions in WRAP states. The multiplicative effect is just a 1.3% decrease in the overall 2018 

emissions inventory as shown in Table 3. While the NONROAD equipment emissions’ percent 

of overall emissions will clearly vary by region, the table provides an indication of the very small 

overall changes in emissions that would result with updating the 2018 NONROAD equipment 

emissions. 

Table 3. Emissions changes from NONROAD model updates and small SI regulations 

expressed as a percent of total 2018 emissions across all categories. 

Area VOC CO NOx PM10 PM2.5 

Maricopa County -0.4% -8.6% -1.3% 0.0% 0.0% 

State of Arizona -0.4% -8.2% -1.6% -0.1% -0.2% 

Pinal County 1.0% 3.2% 3.3% 0.5% 1.4% 

Garfield County -0.5% -10.4% -2.1% -0.2% -0.4% 

Sublette County -0.2% -4.4% 0.6% 0.0% 0.1% 

The net changes to emissions as shown in Table 3 for the key visibility-related pollutants are 

very small, at most a few percent. Updating all 2018 nonroad emissions using the latest model 

from EPA would require significant resources (budget and time). Another factor to consider is 

that the EPA model changes from version NONROAD2004 to NONROAD2005a affect not only 

the 2018 future year, but also the 2002 base year. The direction and size of these differences 

would not be the same as shown for the effects of the model change in 2018 as shown in 

Appendix B, because fleet turnover from 2002 to 2018 shifts the distribution of emissions by 

pollutant and source category. We did not have the resources to so an evaluation as we did for 

2002, but we estimated the effects of the model change on State of Arizona emissions in 2002 as 

about 8% increase in NOx emissions, 2% increase in PM2.5 emissions, and 27% increase in 

VOC emissions. Those estimates are very different in both magnitude and direction from the 

same comparison for year 2018 as shown in Appendix B. 
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Given the very small effect the NONROAD model updates and small SI rule effects are likely to 

have on the overall emission inventory, the significant resources that would be required to 

exercise the model in all WRAP states for all seasons, and the fact that there would then be an 

apples and oranges comparison if the 2002 emissions were also not updated, ENVIRON 

recommends that WRAP not update the NONROAD equipment emissions inventory using the 

latest NONROAD2005d model for the PRP18b inventory. 

We do, however, recommend that States use the latest EPA model, incorporating the small SI 

rule and previous model changes, in any local air quality planning efforts. 

ENVIRON has two additional recommendations in regards to updating the 2018 nonroad 

emissions: 

 Snowmobile emissions contribute only 1% of 2018 WRAP region-wide annual off-road 

equipment NOx emissions, and less than 0,1% of the total region-wide NOx emissions 

shown in Appendix A. Given these very small contribution of snowmobile emissions to 

total 2018 NOx emissions, and the fact that EPA has not updated the NONROAD model 

for the minor amendments to the snowmobile emissions standards, ENVIRON 

recommends not updating the WRAP PRP18b emission inventory to account for the 

amended rule. 

 All NONROAD oil field equipment emissions from the WRAP off-road equipment 

modeling inventories outside of California should be removed from the current PRP18b 

inventories. NONROAD oil field equipment emissions are estimated by the NONROAD 

model for SCCs 2260010010, 2265010010, 2267010010, 2268010010, 2270010010; the 

NONROAD emissions estimates for such equipment are extremely small as they are 

based on inappropriate activity data. ENVIRON has estimated oil field equipment 

emissions in a separate project for WRAP and these are currently in the PRP18a emission 

inventories; excluding the small amount of emissions from these sources in the 

NONROAD model will avoid double-counting. 
 

APPENDIX A 

Table A1. PRP18a WRAP total annual emissions by sector2, with NONROAD category detail added. 

Sector VOC CO NOX PM10 PM2.5 SO2 NH3

Fires 436,714 8,928,013 202,217 726,518 627,618 53,856 45,263

Area 1,860,528 1,446,307 320,345 240,738 211,012 110,772 25,430

Point 299,700 752,028 895,549 190,862 58,607 535,055 14,031

Non Road 328,247 4,367,813 594,397 43,367 39,320 4,074 1,409

 Off-Road Equipment 320,477 4,106,348 299,491 23,172 21,111 722 702

 Aircraft & Locom. 7,770 261,465 294,906 20,195 18,209 3,352 707

Onroad 400,626 5,708,505 519,090 36,368 23,618 5,933 71,408

Biogenic 18,197,340 2,624,814 286,996 0 0 0 0

WOG 749,979 68,260 191,728 0 0 89 0

Road Dust 0 0 0 689,599 72,821 0 0

Fugitive Dust 0 0 0 1,123,032 166,125 0 0

 Wind-Blown Dust 0 0 0 1,962,165 431,676 0 0

Offshore Platforms 0 0 0 0 0 0 0

Offshore Shipping 367,468 40,868 524,797 36,352 35,220 280,561 149

Ag Ammonia 0 0 0 0 0 0 817,256

Total 22,640,603 23,936,606 3,535,119 5,049,001 1,666,017 990341 974946

Table A2. PRP18a WRAP off-road equipment fractions of total emissions. 

Sector VOC CO NOX PM10 PM2.5 SO2 NH3

Off-road Equipment 

Fractions 

1.4% 17.2% 8.5% 0.1% 1.3% 0.1% 0.1% 

 

2 WRAP, 2007. WRAP Regional Modeling Center - Simulation Specifications. 

http://pah.cert.ucr.edu/aqm/308/spec_sheets/SpecSheet_PRP18a_11_03_2008.pdf. April.
 

APPENDIX B 

NONROAD MODELING RESULTS BY GEOGRAPHICAL AREA 
 Page B-1 

State of Arizona NONROAD modeling results 

NOx Emissions (tpd) for Arizona, 2018 summer season average day

Sum of NOx Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 7.99 7.70 7.76 -3.6% -2.9% 0.8%

Airport Ground Support Equipment 0.49 0.54 0.55 11.5% 12.4% 0.8%

Commercial Equipment 4.01 3.79 3.35 -5.6% -16.5% -11.6%

Construction and Mining Equipment 22.13 19.61 19.74 -11.4% -10.8% 0.7%

Industrial Equipment 2.96 3.35 3.35 13.0% 13.0% 0.0%

Lawn and Garden Equipment (Com) 7.80 7.70 5.95 -1.3% -23.8% -22.8%

Lawn and Garden Equipment (Res) 1.18 1.18 0.68 0.1% -42.6% -42.7%

Logging Equipment 0.04 0.04 0.04 1.4% -2.7% -4.0%

Pleasure Craft 11.34 8.67 5.59 -23.5% -50.7% -35.6%

Railroad Equipment 0.10 0.10 0.10 -5.3% -4.0% 1.4%

Recreational Equipment 0.95 0.88 0.77 -7.6% -19.5% -13.0%

Grand Total 59.00 53.57 47.87 -9.2% -18.9% -10.6%

Total VOC Emissions (tpd) for Arizona, 2018 summer season average day

Sum of VOC* Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.93 0.92 0.87 -0.6% -6.7% -6.1%

Airport Ground Support Equipment 0.06 0.06 0.06 6.5% -0.8% -6.9%

Commercial Equipment 5.59 9.48 4.99 69.5% -10.8% -47.4%

Construction and Mining Equipment 4.53 4.15 3.71 -8.4% -18.1% -10.6%

Industrial Equipment 0.36 0.41 0.40 14.8% 10.3% -3.9%

Lawn and Garden Equipment (Com) 33.99 40.45 29.63 19.0% -12.8% -26.7%

Lawn and Garden Equipment (Res) 9.93 22.90 9.03 130.6% -9.1% -60.6%

Logging Equipment 0.13 0.15 0.12 9.9% -7.7% -16.0%

Pleasure Craft 50.06 59.69 12.94 19.2% -74.2% -78.3%

Railroad Equipment 0.02 0.02 0.02 9.7% -8.5% -16.5%

Recreational Equipment 15.15 22.48 21.74 48.4% 43.5% -3.3%

Grand Total 120.77 160.73 83.50 33.1% -30.9% -48.0%

CO Emissions (tpd) for Arizona, 2018 summer season average day

Sum of CO Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 10.97 9.96 7.97 -9.2% -27.4% -20.1%

Airport Ground Support Equipment 0.78 0.80 0.51 2.5% -34.8% -36.4%

Commercial Equipment 305.00 312.53 148.19 2.5% -51.4% -52.6%

Construction and Mining Equipment 66.20 55.80 33.88 -15.7% -48.8% -39.3%

Industrial Equipment 7.46 8.70 7.74 16.6% 3.7% -11.1%

Lawn and Garden Equipment (Com) 1307.61 1327.39 637.16 1.5% -51.3% -52.0%

Lawn and Garden Equipment (Res) 359.84 365.19 176.78 1.5% -50.9% -51.6%

Logging Equipment 1.88 1.92 1.24 2.6% -33.8% -35.5%

Pleasure Craft 293.29 247.99 176.89 -15.4% -39.7% -28.7%

Railroad Equipment 0.49 0.49 0.27 2.0% -45.1% -46.2%

Recreational Equipment 167.46 172.87 130.80 3.2% -21.9% -24.3%

Grand Total 2520.98 2503.66 1321.42 -0.7% -47.6% -47.2%

Exhaust PM10 Emissions (tpd) for Arizona, 2018 summer season average day

Sum of PM10 Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.43 0.57 0.57 32.5% 32.5% 0.0%

Airport Ground Support Equipment 0.01 0.04 0.04 172.6% 173.0% 0.2%

Commercial Equipment 0.33 0.32 0.33 -3.1% 1.2% 4.5%

Construction and Mining Equipment 1.27 1.71 1.71 34.6% 34.8% 0.1%

Industrial Equipment 0.08 0.15 0.15 82.3% 82.5% 0.1%

Lawn and Garden Equipment (Com) 2.34 2.43 2.51 4.0% 7.2% 3.1%

Lawn and Garden Equipment (Res) 0.28 0.29 0.31 3.1% 10.7% 7.3%

Logging Equipment 0.01 0.02 0.02 14.7% 14.7% 0.0%

Pleasure Craft 2.36 0.90 0.14 -61.8% -94.0% -84.2%

Railroad Equipment 0.01 0.01 0.01 2.1% 2.2% 0.1%

Recreational Equipment 0.49 0.60 0.60 21.1% 21.2% 0.1%

Grand Total 7.62 7.04 6.39 -7.6% -16.1% -9.2%

Exhaust PM2.5 Emissions (tpd) for Arizona, 2018 summer season average day Sum of PM2.5 Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.42 0.55 0.55 32.5% 32.5% 0.0%

Airport Ground Support Equipment 0.01 0.04 0.04 172.7% 173.1% 0.2%

Commercial Equipment 0.31 0.30 0.31 -3.2% 1.0% 4.4%

Construction and Mining Equipment 1.22 1.65 1.65 35.0% 35.1% 0.1%

Industrial Equipment 0.08 0.15 0.15 80.9% 81.1% 0.1%

Lawn and Garden Equipment (Com) 2.16 2.25 2.32 4.0% 7.3% 3.1%

Lawn and Garden Equipment (Res) 0.26 0.27 0.29 3.1% 10.7% 7.3%

Logging Equipment 0.01 0.01 0.01 15.5% 15.5% 0.0%

Pleasure Craft 2.17 0.83 0.13 -61.7% -94.0% -84.2%

Railroad Equipment 0.01 0.01 0.01 2.1% 2.2% 0.1%

Recreational Equipment 0.45 0.55 0.55 20.8% 21.0% 0.1%

Grand Total 7.12 6.62 6.02 -7.0% -15.4% -9.0%

% Difference by Category

% Difference by Category

% Difference by Category

% Difference by Category

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NR04 NR05a NR05d

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 Page B-2 

Pinal County, Arizona NONROAD modeling results 

NOx Emissions (tpd) for Pinal County, 2018 summer season average day

Sum of NOx Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 1.84 1.80 1.82 -2.0% -1.3% 0.8%

Airport Ground Support Equipment 0.00 0.00 0.00 100.0% 100.0% 0.8%

Commercial Equipment 0.06 0.05 0.05 -13.1% -23.2% -11.7%

Construction and Mining Equipment 0.30 1.13 1.14 282.1% 284.7% 0.7%

Industrial Equipment 0.08 0.08 0.08 3.8% 3.8% 0.0%

Lawn and Garden Equipment (Com) 0.00 0.14 0.11 100.0% 100.0% -22.9%

Lawn and Garden Equipment (Res) 0.03 0.05 0.03 42.8% -18.1% -42.7%

Pleasure Craft 0.01 0.00 0.01 -37.5% -21.1% 26.2%

Railroad Equipment 0.00 0.01 0.01 163.1% 166.9% 1.4%

Recreational Equipment 0.04 0.04 0.03 0.4% -18.1% -18.4%

Grand Total 2.36 3.31 3.27 40.5% 38.7% -1.3%

Total VOC Emissions (tpd) for Pinal County, 2018 summer season average day

Sum of VOC* Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.22 0.22 0.21 2.4% -4.0% -6.3%

Airport Ground Support Equipment 0.00 0.00 0.00 100.0% 100.0% -7.0%

Commercial Equipment 0.09 0.14 0.07 58.9% -16.0% -47.1%

Construction and Mining Equipment 0.06 0.24 0.22 297.7% 254.1% -10.9%

Industrial Equipment 0.01 0.01 0.01 -8.0% -11.0% -3.3%

Lawn and Garden Equipment (Com) 0.00 0.76 0.55 100.0% 100.0% -27.0%

Lawn and Garden Equipment (Res) 0.29 0.93 0.37 221.2% 29.0% -59.8%

Pleasure Craft 0.07 0.09 0.02 27.5% -76.6% -81.7%

Railroad Equipment 0.00 0.00 0.00 208.9% 156.1% -17.1%

Recreational Equipment 0.62 0.91 0.87 47.6% 40.7% -4.7%

Grand Total 1.35 3.30 2.32 144.1% 71.6% -29.7%

CO Emissions (tpd) for Pinal County, 2018 summer season average day

Sum of CO Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 2.51 2.32 1.85 -7.7% -26.1% -20.0%

Airport Ground Support Equipment 0.00 0.00 0.00 100.0% 100.0% -36.3%

Commercial Equipment 4.39 4.21 1.99 -4.1% -54.5% -52.6%

Construction and Mining Equipment 0.87 3.20 1.95 266.2% 122.5% -39.2%

Industrial Equipment 0.18 0.15 0.14 -16.2% -25.1% -10.6%

Lawn and Garden Equipment (Com) 0.00 24.34 11.68 100.0% 100.0% -52.0%

Lawn and Garden Equipment (Res) 9.31 13.69 6.63 47.1% -28.8% -51.6%

Pleasure Craft 0.35 0.23 0.20 -34.9% -44.3% -14.4%

Railroad Equipment 0.02 0.04 0.02 185.1% 53.6% -46.1%

Recreational Equipment 7.99 8.63 5.90 8.0% -26.2% -31.6%

Grand Total 25.62 56.82 30.36 121.8% 18.5% -46.6%

Exhaust PM10 Emissions (tpd) for Pinal County, 2018 summer season average day

Sum of PM10 Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.10 0.13 0.13 34.7% 34.7% 0.0%

Airport Ground Support Equipment 0.00 0.00 0.00 100.0% 100.0% 0.2%

Commercial Equipment 0.00 0.00 0.00 -10.3% -6.3% 4.5%

Construction and Mining Equipment 0.02 0.10 0.10 480.7% 481.3% 0.1%

Industrial Equipment 0.00 0.00 0.00 70.8% 71.0% 0.1%

Lawn and Garden Equipment (Com) 0.00 0.04 0.05 100.0% 100.0% 3.1%

Lawn and Garden Equipment (Res) 0.01 0.01 0.01 48.7% 59.5% 7.3%

Pleasure Craft 0.00 0.00 0.00 -63.5% -96.6% -90.6%

Railroad Equipment 0.00 0.00 0.00 183.9% 184.2% 0.1%

Recreational Equipment 0.02 0.02 0.02 21.3% 21.6% 0.2%

Grand Total 0.15 0.32 0.32 108.9% 109.7% 0.4%

Exhaust PM2.5 Emissions (tpd) for Pinal County, 2018 summer season average day

Sum of PM2.5 Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.10 0.13 0.13 34.7% 34.7% 0.0%

Airport Ground Support Equipment 0.00 0.00 0.00 100.0% 100.0% 0.2%

Commercial Equipment 0.00 0.00 0.00 -10.4% -6.5% 4.4%

Construction and Mining Equipment 0.02 0.10 0.10 482.1% 482.7% 0.1%

Industrial Equipment 0.00 0.00 0.00 69.0% 69.2% 0.1%

Lawn and Garden Equipment (Com) 0.00 0.04 0.04 100.0% 100.0% 3.1%

Lawn and Garden Equipment (Res) 0.01 0.01 0.01 48.6% 59.5% 7.3%

Pleasure Craft 0.00 0.00 0.00 -63.5% -96.6% -90.6%

Railroad Equipment 0.00 0.00 0.00 183.6% 183.9% 0.1%

Recreational Equipment 0.02 0.02 0.02 21.0% 21.3% 0.2%

Grand Total 0.15 0.31 0.31 108.4% 109.1% 0.4%

% Difference by Category

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0.35

NR04 NR05a NR05d

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NR04 NR05a NR05d
 Page B-3 

Maricopa County, Arizona NONROAD modeling results 

NOx Emissions (tpd) for Maricopa County, 2018 summer season average day

Sum of NOx Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 2.36 2.01 2.03 -14.8% -14.1% 0.8%

Airport Ground Support Equipment 0.45 0.46 0.46 1.2% 2.0% 0.8%

Commercial Equipment 2.73 2.68 2.38 -1.7% -12.6% -11.1%

Construction and Mining Equipment 15.25 13.37 13.46 -12.3% -11.7% 0.7%

Industrial Equipment 2.02 2.22 2.22 10.2% 10.2% 0.0%

Lawn and Garden Equipment (Com) 5.96 5.76 4.49 -3.3% -24.8% -22.2%

Lawn and Garden Equipment (Res) 0.68 0.65 0.37 -4.2% -45.0% -42.6%

Logging Equipment 0.02 0.00 0.00 -100.0% -100.0% 0.0%

Pleasure Craft 1.93 1.40 1.18 -27.4% -38.6% -15.5%

Railroad Equipment 0.06 0.01 0.01 -79.2% -78.9% 1.5%

Recreational Equipment 0.13 0.14 0.08 7.1% -35.5% -39.8%

Grand Total 31.59 28.71 26.70 -9.1% -15.5% -7.0%

Total VOC Emissions (tpd) for Maricopa County, 2018 summer season average day Sum of VOC* Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.27 0.24 0.23 -9.8% -16.3% -7.2%

Airport Ground Support Equipment 0.06 0.06 0.05 -2.9% -10.0% -7.3%

Commercial Equipment 3.84 7.31 3.60 90.2% -6.4% -50.8%

Construction and Mining Equipment 3.13 2.87 2.53 -8.2% -19.0% -11.8%

Industrial Equipment 0.26 0.28 0.27 10.8% 6.0% -4.4%

Lawn and Garden Equipment (Com) 26.19 31.92 22.86 21.9% -12.7% -28.4%

Lawn and Garden Equipment (Res) 5.95 14.96 5.25 151.4% -11.7% -64.9%

Logging Equipment 0.07 0.00 0.00 -100.0% -100.0% 0.0%

Pleasure Craft 12.15 16.65 3.22 37.1% -73.5% -80.7%

Railroad Equipment 0.01 0.00 0.00 -75.6% -79.9% -17.7%

Recreational Equipment 1.05 1.59 1.32 51.8% 26.4% -16.8%

Grand Total 52.97 75.89 39.34 43.3% -25.7% -48.2%

CO Emissions (tpd) for Maricopa County, 2018 summer season average day

Sum of CO Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 3.30 2.65 2.11 -19.7% -36.0% -20.2%

Airport Ground Support Equipment 0.73 0.69 0.44 -5.6% -40.3% -36.7%

Commercial Equipment 211.73 229.83 108.93 8.5% -48.6% -52.6%

Construction and Mining Equipment 46.13 38.75 23.43 -16.0% -49.2% -39.5%

Industrial Equipment 5.53 6.17 5.47 11.6% -1.0% -11.3%

Lawn and Garden Equipment (Com) 1012.89 1044.99 500.88 3.2% -50.5% -52.1%

Lawn and Garden Equipment (Res) 218.73 215.85 104.43 -1.3% -52.3% -51.6%

Logging Equipment 1.00 0.00 0.00 -100.0% -100.0% 0.0%

Pleasure Craft 71.63 53.09 41.29 -25.9% -42.4% -22.2%

Railroad Equipment 0.29 0.07 0.04 -77.5% -87.9% -46.3%

Recreational Equipment 40.09 44.24 21.83 10.4% -45.5% -50.7%

Grand Total 1612.05 1636.32 808.84 1.5% -49.8% -50.6%

Exhaust PM10 Emissions (tpd) for Maricopa County, 2018 summer season average day

Sum of PM10 Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.13 0.15 0.15 17.2% 17.2% 0.0%

Airport Ground Support Equipment 0.01 0.03 0.03 147.5% 147.9% 0.2%

Commercial Equipment 0.22 0.23 0.24 1.5% 6.1% 4.5%

Construction and Mining Equipment 0.88 1.17 1.17 33.2% 33.4% 0.1%

Industrial Equipment 0.06 0.10 0.10 67.6% 67.8% 0.1%

Lawn and Garden Equipment (Com) 1.80 1.87 1.93 4.0% 7.2% 3.1%

Lawn and Garden Equipment (Res) 0.17 0.17 0.18 -0.3% 7.0% 7.3%

Logging Equipment 0.01 0.00 0.00 -100.0% -100.0% 0.0%

Pleasure Craft 0.69 0.26 0.03 -62.8% -95.6% -88.0%

Railroad Equipment 0.01 0.00 0.00 -77.6% -77.6% 0.1%

Recreational Equipment 0.03 0.03 0.03 19.7% 21.4% 1.4%

Grand Total 4.00 4.01 3.87 0.2% -3.4% -3.6%

Exhaust PM2.5 Emissions (tpd) for Maricopa County, 2018 summer season average day Sum of PM2.5 Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.12 0.14 0.14 17.2% 17.2% 0.0%

Airport Ground Support Equipment 0.01 0.03 0.03 147.5% 147.9% 0.2%

Commercial Equipment 0.21 0.22 0.23 1.4% 5.8% 4.4%

Construction and Mining Equipment 0.84 1.13 1.13 33.6% 33.7% 0.1%

Industrial Equipment 0.06 0.10 0.10 66.3% 66.5% 0.1%

Lawn and Garden Equipment (Com) 1.66 1.73 1.78 4.0% 7.2% 3.1%

Lawn and Garden Equipment (Res) 0.16 0.15 0.17 -0.3% 7.0% 7.3%

Logging Equipment 0.01 0.00 0.00 -100.0% -100.0% 0.0%

Pleasure Craft 0.64 0.24 0.03 -62.8% -95.5% -88.0%

Railroad Equipment 0.01 0.00 0.00 -77.6% -77.6% 0.1%

Recreational Equipment 0.03 0.03 0.03 19.5% 21.2% 1.4%

Grand Total 3.75 3.78 3.64 0.8% -2.8% -3.5%

% Difference by Category

% Difference by Category

% Difference by Category

% Difference by Category

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 Page B-4 

Garfield County, Colorado NONROAD modeling results 

NOx Emissions (tpd) for Garfield County, 2018 summer season average day Sum of NOx Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.36 0.12 0.12 -67.2% -66.9% 0.9%

Airport Ground Support Equipment 0.00 0.00 0.00 100.0% 100.0% 0.8%

Commercial Equipment 0.04 0.04 0.04 10.8% -3.7% -13.1%

Construction and Mining Equipment 0.16 0.32 0.32 104.9% 106.3% 0.7%

Industrial Equipment 0.11 0.04 0.04 -64.4% -65.5% -3.1%

Lawn and Garden Equipment (Com) 0.11 0.06 0.05 -39.9% -54.8% -24.8%

Lawn and Garden Equipment (Res) 0.02 0.02 0.01 30.4% -25.8% -43.1%

Logging Equipment 0.00 0.00 0.00 100.0% 100.0% -4.8%

Pleasure Craft 0.10 0.12 0.10 20.1% -2.0% -18.3%

Railroad Equipment 0.00 0.00 0.00 222.0% 226.3% 1.3%

Recreational Equipment 0.04 0.01 0.01 -60.0% -67.5% -18.7%

Grand Total 0.92 0.74 0.69 -19.0% -24.8% -7.1%

Total VOC Emissions (tpd) for Garfield County, 2018 summer season average day Sum of VOC* Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.04 0.01 0.01 -67.7% -69.3% -4.7%

Airport Ground Support Equipment 0.00 0.00 0.00 100.0% 100.0% -6.1%

Commercial Equipment 0.05 0.08 0.05 69.8% 1.2% -40.4%

Construction and Mining Equipment 0.03 0.06 0.06 104.1% 88.7% -7.5%

Industrial Equipment 0.05 0.01 0.01 -78.3% -83.0% -21.5%

Lawn and Garden Equipment (Com) 0.39 0.27 0.20 -30.0% -46.9% -24.1%

Lawn and Garden Equipment (Res) 0.09 0.19 0.10 115.9% 16.9% -45.8%

Logging Equipment 0.00 0.00 0.00 100.0% 100.0% -9.9%

Pleasure Craft 0.43 0.47 0.26 9.3% -38.8% -44.0%

Railroad Equipment 0.00 0.00 0.00 257.5% 208.6% -13.7%

Recreational Equipment 0.51 0.29 0.28 -42.9% -44.8% -3.3%

Grand Total 1.59 1.40 0.99 -11.9% -37.8% -29.4%

CO Emissions (tpd) for Garfield County, 2018 summer season average day Sum of CO Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.52 0.17 0.13 -67.8% -74.8% -21.8%

Airport Ground Support Equipment 0.00 0.00 0.00 100.0% 100.0% -35.8%

Commercial Equipment 2.57 3.12 1.48 21.6% -42.3% -52.5%

Construction and Mining Equipment 0.45 0.86 0.53 91.9% 18.5% -38.3%

Industrial Equipment 3.81 0.68 0.31 -82.2% -91.8% -53.9%

Lawn and Garden Equipment (Com) 14.88 9.51 4.55 -36.1% -69.5% -52.2%

Lawn and Garden Equipment (Res) 3.65 4.91 2.37 34.3% -35.0% -51.6%

Logging Equipment 0.00 0.04 0.02 100.0% 100.0% -35.0%

Pleasure Craft 1.91 2.01 1.81 5.2% -4.9% -9.6%

Railroad Equipment 0.00 0.01 0.01 248.3% 88.9% -45.8%

Recreational Equipment 5.33 2.72 1.91 -49.1% -64.3% -29.8%

Grand Total 33.11 24.01 13.12 -27.5% -60.4% -45.3%

Exhaust PM10 Emissions (tpd) for Garfield County, 2018 summer season average day Sum of PM10 Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.02 0.01 0.01 -60.2% -60.2% 0.0%

Airport Ground Support Equipment 0.00 0.00 0.00 100.0% 100.0% 0.2%

Commercial Equipment 0.00 0.00 0.00 13.5% 18.6% 4.5%

Construction and Mining Equipment 0.01 0.03 0.03 213.5% 213.0% -0.1%

Industrial Equipment 0.00 0.00 0.00 -17.9% -16.9% 1.2%

Lawn and Garden Equipment (Com) 0.03 0.02 0.02 -35.4% -33.2% 3.5%

Lawn and Garden Equipment (Res) 0.00 0.00 0.00 35.7% 46.2% 7.8%

Logging Equipment 0.00 0.00 0.00 100.0% 100.0% 0.0%

Pleasure Craft 0.03 0.01 0.00 -72.4% -85.0% -45.5%

Railroad Equipment 0.00 0.00 0.00 244.9% 245.3% 0.1%

Recreational Equipment 0.02 0.01 0.01 -54.2% -54.1% 0.2%

Grand Total 0.11 0.08 0.08 -28.5% -30.7% -3.1%

Exhaust PM2.5 Emissions (tpd) for Garfield County, 2018 summer season average day Sum of PM2.5 Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.02 0.01 0.01 -60.2% -60.2% 0.0%

Airport Ground Support Equipment 0.00 0.00 0.00 100.0% 100.0% 0.2%

Commercial Equipment 0.00 0.00 0.00 13.4% 18.3% 4.4%

Construction and Mining Equipment 0.01 0.03 0.03 214.3% 213.8% -0.1%

Industrial Equipment 0.00 0.00 0.00 -17.2% -16.3% 1.1%

Lawn and Garden Equipment (Com) 0.02 0.02 0.02 -35.4% -33.2% 3.4%

Lawn and Garden Equipment (Res) 0.00 0.00 0.00 35.7% 46.2% 7.8%

Logging Equipment 0.00 0.00 0.00 100.0% 100.0% 0.0%

Pleasure Craft 0.03 0.01 0.00 -72.3% -84.9% -45.4%

Railroad Equipment 0.00 0.00 0.00 246.0% 246.4% 0.1%

Recreational Equipment 0.02 0.01 0.01 -54.3% -54.2% 0.2%

Grand Total 0.10 0.07 0.07 -27.8% -30.0% -3.1%

% Difference by Category

% Difference by Category

% Difference by Category

% Difference by Category

% Difference by Category

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 Page B-5 

Sublette County, Wyoming NONROAD modeling results 

NOx Emissions (tpd) for Sublette County, 2018 summer season average day

Sum of NOx Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 1.18 1.42 1.43 20.0% 21.0% 0.8%

Airport Ground Support Equipment 0.00 0.00 0.00 100.0% 100.0% 0.8%

Commercial Equipment 0.01 0.01 0.01 16.1% -0.2% -14.0%

Construction and Mining Equipment 0.07 0.06 0.06 -12.8% -12.3% 0.6%

Industrial Equipment 0.03 0.01 0.01 -74.4% -75.5% -4.2%

Lawn and Garden Equipment (Com) 0.00 0.01 0.00 100.0% 100.0% -25.8%

Lawn and Garden Equipment (Res) 0.00 0.00 0.00 -5.7% -46.4% -43.2%

Logging Equipment 0.00 0.00 0.00 100.0% 100.0% -5.3%

Pleasure Craft 0.49 0.45 0.39 -8.5% -18.9% -11.4%

Railroad Equipment 0.00 0.00 0.00 -100.0% -100.0% 0.0%

Recreational Equipment 0.02 0.02 0.02 -2.2% -9.5% -7.5%

Grand Total 1.80 1.97 1.93 9.6% 7.1% -2.3%

Total VOC Emissions (tpd) for Sublette County, 2018 summer season average day

Sum of VOC* Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.14 0.17 0.17 20.2% 17.0% -2.6%

Airport Ground Support Equipment 0.00 0.00 0.00 100.0% 100.0% -5.9%

Commercial Equipment 0.01 0.01 0.01 67.7% 4.1% -37.9%

Construction and Mining Equipment 0.01 0.01 0.01 -13.7% -19.8% -7.1%

Industrial Equipment 0.01 0.00 0.00 -82.7% -86.5% -21.9%

Lawn and Garden Equipment (Com) 0.00 0.02 0.02 100.0% 100.0% -23.4%

Lawn and Garden Equipment (Res) 0.02 0.03 0.02 42.3% -16.0% -41.0%

Logging Equipment 0.00 0.00 0.00 100.0% 100.0% -7.9%

Pleasure Craft 0.46 0.44 0.24 -4.7% -47.8% -45.2%

Railroad Equipment 0.00 0.00 0.00 -100.0% -100.0% 0.0%

Recreational Equipment 0.30 0.38 0.37 26.8% 23.9% -2.3%

Grand Total 0.97 1.08 0.84 11.7% -13.0% -22.1%

CO Emissions (tpd) for Sublette County, 2018 summer season average day

Sum of CO Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 1.77 2.04 1.71 15.3% -3.2% -16.1%

Airport Ground Support Equipment 0.00 0.00 0.00 100.0% 100.0% -35.4%

Commercial Equipment 0.36 0.46 0.22 27.8% -39.4% -52.6%

Construction and Mining Equipment 0.19 0.16 0.10 -16.4% -48.5% -38.5%

Industrial Equipment 1.12 0.16 0.08 -85.3% -93.2% -54.0%

Lawn and Garden Equipment (Com) 0.00 0.84 0.40 100.0% 100.0% -52.2%

Lawn and Garden Equipment (Res) 1.00 0.97 0.47 -2.8% -53.0% -51.6%

Logging Equipment 0.00 0.01 0.01 100.0% 100.0% -34.8%

Pleasure Craft 2.49 2.05 1.76 -17.4% -29.2% -14.2%

Railroad Equipment 0.00 0.00 0.00 -100.0% -100.0% 0.0%

Recreational Equipment 2.23 2.54 2.06 13.9% -7.6% -18.9%

Grand Total 9.15 9.23 6.80 1.0% -25.7% -26.4%

Exhaust PM10 Emissions (tpd) for Sublette County, 2018 summer season average day Sum of PM10 Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.07 0.11 0.11 46.9% 47.0% 0.0%

Airport Ground Support Equipment 0.00 0.00 0.00 100.0% 100.0% 0.2%

Commercial Equipment 0.00 0.00 0.00 19.0% 24.4% 4.5%

Construction and Mining Equipment 0.00 0.01 0.01 32.5% 32.6% 0.1%

Industrial Equipment 0.00 0.00 0.00 -38.6% -37.7% 1.4%

Lawn and Garden Equipment (Com) 0.00 0.00 0.00 100.0% 100.0% 3.5%

Lawn and Garden Equipment (Res) 0.00 0.00 0.00 -1.8% 5.8% 7.8%

Logging Equipment 0.00 0.00 0.00 100.0% 100.0% 0.0%

Pleasure Craft 0.03 0.01 0.01 -63.0% -78.8% -42.6%

Railroad Equipment 0.00 0.00 0.00 -100.0% -100.0% 0.0%

Recreational Equipment 0.01 0.01 0.01 8.8% 8.9% 0.1%

Grand Total 0.12 0.14 0.13 12.8% 8.5% -3.9%

Exhaust PM2.5 Emissions (tpd) for Sublette County, 2018 summer season average day Sum of PM2.5 Model Version

Emission Source Category NR04 NR05a NR05d NR04 to NR05a NR04 to NR05d NR05a to NR05d

Agricultural Equipment 0.07 0.10 0.10 47.0% 47.0% 0.0%

Airport Ground Support Equipment 0.00 0.00 0.00 100.0% 100.0% 0.2%

Commercial Equipment 0.00 0.00 0.00 18.4% 23.6% 4.4%

Construction and Mining Equipment 0.00 0.00 0.00 32.8% 33.0% 0.1%

Industrial Equipment 0.00 0.00 0.00 -38.0% -37.2% 1.3%

Lawn and Garden Equipment (Com) 0.00 0.00 0.00 100.0% 100.0% 3.4%

Lawn and Garden Equipment (Res) 0.00 0.00 0.00 -1.8% 5.8% 7.8%

Logging Equipment 0.00 0.00 0.00 100.0% 100.0% 0.0%

Pleasure Craft 0.03 0.01 0.01 -62.5% -78.4% -42.4%

Railroad Equipment 0.00 0.00 0.00 -100.0% -100.0% 0.0%

Recreational Equipment 0.01 0.01 0.01 8.3% 8.4% 0.1%

Grand Total 0.12 0.13 0.13 13.8% 9.5% -3.8%

% Difference by Category

% Difference by Category

% Difference by Category

% Difference by Category

% Difference by Category

NOx Emissions - All 

Categories

0

0.5

1

1.5

2

2.5

NR04 NR05a NR05d

Total VOC Emissions - All 

Categories

0

0.2

0.4

0.6

0.8

1

1.2

NR04 NR05a NR05d

CO Emissions - All Categories

0

2

4

6

8

10

NR04 NR05a NR05d

Exhaust PM10 Emissions - All 

Categories

0

0.05

0.1

0.15

NR04 NR05a NR05d

Exhaust PM2.5 Emissions - 

All Categories

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

NR04 NR05a NR05d