B-1 

Appendix B 

2008 Base Year Average Winter Day 

Carbon Monoxide (CO) Emissions Inventory 

For St. Louis County and St. Louis City 

Missouri Department of Natural Resources 

Division of Environmental Quality 

Air Pollution Control Program 

Jefferson City, Missouri 

Adoption 

March 27, 2014 

Project Number: 1971-CO-5
B-2 

Table of Contents 

PROJECT NUMBER: 1971-CO-5TABLE OF CONTENTS ..................................................................................... 1

LIST OF TABLES ....................................................................................................................................................... 3

AVERAGE WINTER DAY CO EMISSIONS INVENTORY SUMMARY ........................................................... 4

APPENDIX B-1 2008 POINT AND AREA SOURCE EMISSIONS ................................................................ 4 

APPENDIX B-2 2008 AREA SOURCE AVERAGE WINTER DAY EMISSIONS ....................................... 6

APPENDIX B-3 ON-ROAD MOBILE SOURCE EMISSIONS ..................................................................... 15

APPENDIX B-4 2008 OFF-ROAD MOBILE SOURCE EMISSIONS .......................................................... 17

APPENDIX B-5 TEMPORAL ALLOCATION METHODOLOGY APPLIED TO RESIDENTIAL FUEL 

COMBUSTION AREA SOURCE CATEGORIES ................................................................................................ 18

COUNTY NONATTAINMENT AREA .................................................................................................................. 20

QA/QC ........................................................................................................................................................................ 22 
B-3 

List of Tables 

Table B-1 2008 Average Winter Day CO Emissions Inventory Summary for 

St. Louis County and St. Louis City 

 Table B-2 2008 Point Source CO Emissions for St. Louis County and St. Louis City 

Table B-3 2008 Area Source Average Winter Day CO Emissions (Excluding 

Residential Fuel Combustion) 

Table B-4 2008 Average Winter Day CO Emissions for Residential Fuel Combustion 

Table B-5 2008 Area Source CO Emissions Summary for St. Louis County and 

St. Louis City 

Table B-6 SCC Codes and Descriptions for Marine and Rail Source Categories Not 

Included in the Analysis for Area Source Emissions 

Table B-7 2008 On-Road Mobile Source Winter Month CO Emissions for 

St. Louis County and St. Louis City 

Table B-8 2008 On-Road Mobile Source Average Winter Day CO Emissions for 

St. Louis County and St. Louis City 

 Table B-9 2008 Off-Road Mobile Source Emissions for St. Louis County and 

St. Louis City (Excludes Marine and Rail Emissions) 

 Table B-10 2008 Marine and Rail Emissions for St. Louis County and St. Louis City 

Table B-11 2008 Total Off-Road Mobile Source Emissions for 

St. Louis County and St. Louis City 

Table B-12 Calculation of Average January Day Temporal Allocation Factors for 

Residential Fuel Combustion SCCs 
B-4 

Average Winter Day CO Emissions Inventory Summary 

Table B-1 

2008 Average Winter Day CO Emissions Inventory Summary for 

St. Louis County and St. Louis City 

Geographic Area Source Category 2008 CO Emissions 

(Tons/Average Winter Day) 

St. Louis County Point Sources 13.65

St. Louis County Area Sources 52.33

St. Louis County On Road Mobile Sources 425.49

St. Louis County Off Road Mobile Sources 211.50

St. Louis County subtotal 702.97

St. Louis City Point Sources 3.61

St. Louis City Area Sources 17.93

St. Louis City On Road Mobile Sources 106.93

St. Louis City Off Road Mobile Sources 38.97

St. Louis City subtotal 167.44

Total (St. Louis City and County) Point Sources 17.26

Total (St. Louis City and County) Area Sources 70.26

Total (St. Louis City and County) On Road Mobile Sources 532.42

Total (St. Louis City and County) Off Road Mobile Sources 250.48

Total (St. Louis City and County) Total 870.42

 * - subtotals may not sum due to rounding
B-5 

Appendix B-1 2008 Point and Area Source Emissions 

The 2008 point source emissions by county for St. Louis County and St. Louis City are 

summarized below in Table B-2 for an average winter day. The development of the annual point 

source emissions inventory is detailed in Appendix A, the 2008 Base Year Annual Carbon 

Monoxide Emissions Inventory for St. Louis county and St. Louis City. The average winter day 

emissions listed in Table B-2 were developed by dividing the 2008 annual CO emissions from 

point sources in St. Louis County and St. Louis City and dividing by 366. 

Table B-2 

2008 Point Source CO Emissions for St. Louis County and St. Louis City 

Geographic Area 

2008 Point Source CO Emissions 

(Tons/Average Winter Day) 

St. Louis County 13.65 

St. Louis City 3.61 

Totals 17.26 
B-6 

Appendix B-2 2008 Area Source Average Winter Day Emissions 

The development of the 2008 annual CO emissions inventory is detailed in Appendix A. In 

order to calculate average winter day CO emissions for the all area source categories other than 

residential fuel combustion, the annual emissions were divided by 366. The 2008 average winter 

day CO emissions for all area source categories by SCC other than residential fuel combustion 

are listed in Table B-3. 

In order to calculate average winter day emissions for residential fuel combustion the Air 

Program used the EPA’s temporal allocation method. A summary of EPA’s temporal allocation 

method can be found in Appendix B-5. The 2008 average winter day CO emissions for all 

residential fuel combustion source categories by SCC are listed in Table B-4. The average 

winter day CO emissions inventory summary for all area sources is listed in Table B-5. 

When calculating the area source emissions, certain mobile source categories are calculated with 

methods similar to area sources, particularly marine and rail categories. Although these off road 

mobile source categories were calculated with area source methodologies, they are not included 

in the area source inventory listed in Table B-5. The source classification codes (SCCs) 

pertaining to these off-road mobile sources that were calculated with area source methodologies 

are listed in Table B-6, and the emissions from these categories are included as off-road mobile 

source emissions. 

 
B-7 

Table B-3 2008 Area Source Average Winter Day CO Emissions (Excluding Residential Fuel Combust

Geographic Area SCC SCC Level One SCC Level Two SCC Level Three SCC Level Four 

St. Louis County 2102001000 Stationary Source Fuel Combustion Anthracite Coal Industrial Total: All Boiler Types St. Louis County 2102002000 Stationary Source Fuel Combustion Bituminous/Subbituminous Coal Industrial Total: All Boiler Types St. Louis County 2102004000 Stationary Source Fuel Combustion Distillate Oil Industrial Total: Boilers and IC Engines St. Louis County 2102005000 Stationary Source Fuel Combustion Residual Oil Industrial Total: All Boiler Types St. Louis County 2102006000 Stationary Source Fuel Combustion Natural Gas Industrial Total: Boilers and IC Engines St. Louis County 2102007000 Stationary Source Fuel Combustion Liquefied Petroleum Gas (LPG) Industrial Total: All Boiler Types St. Louis County 2102008000 Stationary Source Fuel Combustion Wood Industrial Total: All Boiler Types St. Louis County 2102011000 Stationary Source Fuel Combustion Kerosene Industrial Total: All Boiler Types St. Louis County 2103001000 Stationary Source Fuel Combustion Anthracite Coal Commercial/Institutional Total: All Boiler Types St. Louis County 2103002000 Stationary Source Fuel Combustion Bituminous/Subbituminous Coal Commercial/Institutional Total: All Boiler Types St. Louis County 2103004000 Stationary Source Fuel Combustion Distillate Oil Commercial/Institutional Total: Boilers and IC Engines St. Louis County 2103005000 Stationary Source Fuel Combustion Residual Oil Commercial/Institutional Total: All Boiler Types St. Louis County 2103006000 Stationary Source Fuel Combustion Natural Gas Commercial/Institutional Total: Boilers and IC Engines St. Louis County 2103007000 Stationary Source Fuel Combustion Liquefied Petroleum Gas (LPG) Commercial/Institutional Total: All Combustor Types St. Louis County 2103008000 Stationary Source Fuel Combustion Wood Commercial/Institutional Total: All Boiler Types St. Louis County 2103011000 Stationary Source Fuel Combustion Kerosene Commercial/Institutional Total: All Combustor Types 
B-8 

Geographic Area SCC SCC Level One SCC Level Two SCC Level Three SCC Level Four 

St. Louis County 2104002000 Stationary Source Fuel Combustion Bituminous/Subbituminous Coal Residential Total: All Combustor Types St. Louis County 2104004000 Stationary Source Fuel Combustion Distillate Oil Residential Total: All Combustor Types St. Louis County 2104006000 Stationary Source Fuel Combustion Natural Gas Residential Total: All Combustor Types St. Louis County 2104007000 Stationary Source Fuel Combustion Liquified Petroleum Gas (LPG) Residential Total: All Combustor Types St. Louis County 2104008100 Stationary Source Fuel Combustion Wood Residential Fireplace: general St. Louis County 2104008210 Stationary Source Fuel Combustion Wood Residential Woodstove: fireplace inserts; non-EPA certified St. Louis County 2104008220 Stationary Source Fuel Combustion Wood Residential Woodstove: fireplace inserts; EPA certified; non-catalytic St. Louis County 2104008230 Stationary Source Fuel Combustion Wood Residential Woodstove: fireplace inserts; EPA certified; catalytic St. Louis County 2104008310 Stationary Source Fuel Combustion Wood Residential Woodstove: freestanding, non

EPA certified 

St. Louis County 2104008320 Stationary Source Fuel Combustion Wood Residential Woodstove: freestanding, EP

certified, non-catalytic 

St. Louis County 2104008330 Stationary Source Fuel Combustion Wood Residential Woodstove: freestanding, EP

certified, catalytic 

St. Louis County 2104008400 Stationary Source Fuel Combustion Wood Residential Woodstove: pellet-fired, gene

(freestanding or FP insert) 

St. Louis County 2104008510 Stationary Source Fuel Combustion Wood Residential Furnace: Indoor, cordwood- fired, non-EPA certified St. Louis County 2104008610 Stationary Source Fuel Combustion Wood Residential Hydronic heater: outdoor St. Louis County 2104009000 Stationary Source Fuel Combustion Firelog Residential Total: All Combustor Types St. Louis County 2104011000 Stationary Source Fuel Combustion Kerosene Residential Total: All Heater Types St. Louis County 2302002100 Industrial Processes Commercial Cooking - Charbroiling Food and Kindred Products: SIC 20 Conveyorized Charbroiling 
B-9 

Geographic Area SCC SCC Level One SCC Level Two SCC Level Three SCC Level Four 

St. Louis County 2302002200 Industrial Processes Commercial Cooking - Charbroiling Food and Kindred Products: SIC 20 Under-fired Charbroiling St. Louis County 2302003000 Industrial Processes Commercial Cooking - Frying Food and Kindred Products: SIC 20 Deep Fat Fying St. Louis County 2302003100 Industrial Processes Commercial Cooking - Frying Food and Kindred Products: SIC 20 Flat Griddle Frying St. Louis County 2302003200 Industrial Processes Commercial Cooking - Frying Food and Kindred Products: SIC 20 Clamshell Griddle Frying St. Louis County Total St. Louis City 2102001000 Stationary Source Fuel Combustion Anthracite Coal Industrial Total: All Boiler Types St. Louis City 2102002000 Stationary Source Fuel Combustion Bituminous/Subbituminous Coal Industrial Total: All Boiler Types St. Louis City 2102004000 Stationary Source Fuel Combustion Distillate Oil Industrial Total: Boilers and IC Engines St. Louis City 2102005000 Stationary Source Fuel Combustion Residual Oil Industrial Total: All Boiler Types St. Louis City 2102006000 Stationary Source Fuel Combustion Natural Gas Industrial Total: Boilers and IC Engines St. Louis City 2102007000 Stationary Source Fuel Combustion Liquefied Petroleum Gas (LPG) Industrial Total: All Boiler Types St. Louis City 2102008000 Stationary Source Fuel Combustion Wood Industrial Total: All Boiler Types St. Louis City 2102011000 Stationary Source Fuel Combustion Kerosene Industrial Total: All Boiler Types St. Louis City 2103001000 Stationary Source Fuel Combustion Anthracite Coal Commercial/Institutional Total: All Boiler Types St. Louis City 2103002000 Stationary Source Fuel Combustion Bituminous/Subbituminous Coal Commercial/Institutional Total: All Boiler Types St. Louis City 2103004000 Stationary Source Fuel Combustion Distillate Oil Commercial/Institutional Total: Boilers and IC Engines St. Louis City 2103005000 Stationary Source Fuel Combustion Residual Oil Commercial/Institutional Total: All Boiler Types 
B-10 

Geographic Area SCC SCC Level One SCC Level Two SCC Level Three SCC Level Four 

St. Louis City 2103006000 Stationary Source Fuel Combustion Natural Gas Commercial/Institutional Total: Boilers and IC Engines St. Louis City 2103007000 Stationary Source Fuel Combustion Liquefied Petroleum Gas (LPG) Commercial/Institutional Total: All Combustor Types St. Louis City 2103008000 Stationary Source Fuel Combustion Wood Commercial/Institutional Total: All Boiler Types St. Louis City 2103011000 Stationary Source Fuel Combustion Kerosene Commercial/Institutional Total: All Combustor Types St. Louis City 2104002000 Stationary Source Fuel Combustion Bituminous/Subbituminous Coal Residential Total: All Combustor Types St. Louis City 2104004000 Stationary Source Fuel Combustion Distillate Oil Residential Total: All Combustor Types St. Louis City 2104006000 Stationary Source Fuel Combustion Natural Gas Residential Total: All Combustor Types St. Louis City 2104007000 Stationary Source Fuel Combustion Liquified Petroleum Gas (LPG) Residential Total: All Combustor Types St. Louis City 2104008100 Stationary Source Fuel Combustion Wood Residential Fireplace: general St. Louis City 2104008210 Stationary Source Fuel Combustion Wood Residential Woodstove: fireplace inserts; non-EPA certified St. Louis City 2104008220 Stationary Source Fuel Combustion Wood Residential Woodstove: fireplace inserts; EPA certified; non-catalytic St. Louis City 2104008230 Stationary Source Fuel Combustion Wood Residential Woodstove: fireplace inserts; EPA certified; catalytic St. Louis City 2104008310 Stationary Source Fuel Combustion Wood Residential Woodstove: freestanding, non

EPA certified 

St. Louis City 2104008320 Stationary Source Fuel Combustion Wood Residential Woodstove: freestanding, EP

certified, non-catalytic 

St. Louis City 2104008330 Stationary Source Fuel Combustion Wood Residential Woodstove: freestanding, EP

certified, catalytic 

St. Louis City 2104008400 Stationary Source Fuel Combustion Wood Residential Woodstove: pellet-fired, gene

(freestanding or FP insert) 

St. Louis City 2104008510 Stationary Source Fuel Combustion Wood Residential Furnace: Indoor, cordwood- fired, non-EPA certified 
B-11 

Geographic Area SCC SCC Level One SCC Level Two SCC Level Three SCC Level Four 

St. Louis City 2104008610 Stationary Source Fuel Combustion Wood Residential Hydronic heater: outdoor St. Louis City 2104009000 Stationary Source Fuel Combustion Firelog Residential Total: All Combustor Types St. Louis City 2104011000 Stationary Source Fuel Combustion Kerosene Residential Total: All Heater Types St. Louis City 2302002100 Industrial Processes Commercial Cooking - Charbroiling Food and Kindred Products: SIC 20 Conveyorized Charbroiling St. Louis City 2302002200 Industrial Processes Commercial Cooking - Charbroiling Food and Kindred Products: SIC 20 Under-fired Charbroiling St. Louis City 2302003000 Industrial Processes Commercial Cooking - Frying Food and Kindred Products: SIC 20 Deep Fat Fying St. Louis City 2302003100 Industrial Processes Commercial Cooking - Frying Food and Kindred Products: SIC 20 Flat Griddle Frying St. Louis City 2302003200 Industrial Processes Commercial Cooking - Frying Food and Kindred Products: SIC 20 Clamshell Griddle Frying St. Louis City Total Combined St. Louis County and St. Louis City Total 
B-12 

Table B-4 2008 Average Winter Day CO Emissions for Residential Fuel Combustion 

Geographic Area SCC SCC Level One SCC Level Two SCC Level Three SCC Level Four 

St. Louis County 2104002000 Stationary Source Fuel Combustion Bituminous/Subbitumino us Coal Residential Total: All Combustor Types St. Louis County 2104004000 Stationary Source Fuel Combustion Distillate Oil Residential Total: All Combustor Types St. Louis County 2104006000 Stationary Source Fuel Combustion Natural Gas Residential Total: All Combustor Types St. Louis County 2104007000 Stationary Source Fuel Combustion Liquefied Petroleum Gas (LPG) Residential Total: All Combustor Types St. Louis County 2104008100 Stationary Source Fuel Combustion Wood Residential Fireplace: general St. Louis County 2104008210 Stationary Source Fuel Combustion Wood Residential Woodstove: fireplace inserts; non-E

certified 

St. Louis County 2104008220 Stationary Source Fuel Combustion Wood Residential Woodstove: fireplace inserts; EPA certified; non-catalytic St. Louis County 2104008230 Stationary Source Fuel Combustion Wood Residential Woodstove: fireplace inserts; EPA certified; catalytic St. Louis County 2104008310 Stationary Source Fuel Combustion Wood Residential Woodstove: freestanding, non-EPA certified St. Louis County 2104008320 Stationary Source Fuel Combustion Wood Residential Woodstove: freestanding, EPA certi

non-catalytic 

St. Louis County 2104008330 Stationary Source Fuel Combustion Wood Residential Woodstove: freestanding, EPA certi

catalytic 

St. Louis County 2104008400 Stationary Source Fuel Combustion Wood Residential Woodstove: pellet-fired, general (freestanding or FP insert) St. Louis County 2104008510 Stationary Source Fuel Combustion Wood Residential Furnace: Indoor, cordwood-fired, no

EPA certified 

St. Louis County 2104008610 Stationary Source Fuel Combustion Wood Residential Hydronic heater: outdoor St. Louis County 2104009000 Stationary Source Fuel Combustion Fire log Residential Total: All Combustor Types St. Louis County 2104011000 Stationary Source Fuel Combustion Kerosene Residential Total: All Heater Types St. Louis County Total St. Louis City 2104002000 Stationary Source Fuel Combustion Bituminous/Subbitumino us Coal Residential Total: All Combustor Types St. Louis City 2104004000 Stationary Source Fuel Combustion Distillate Oil Residential Total: All Combustor Types St. Louis City 2104006000 Stationary Source Fuel Combustion Natural Gas Residential Total: All Combustor Types St. Louis City 2104007000 Stationary Source Fuel Combustion Liquefied Petroleum Gas (LPG) Residential Total: All Combustor Types St. Louis City 2104008100 Stationary Source Fuel Combustion Wood Residential Fireplace: general 
B-13 

Geographic Area SCC SCC Level One SCC Level Two SCC Level Three SCC Level Four 

St. Louis City 2104008210 Stationary Source Fuel Combustion Wood Residential Woodstove: fireplace inserts; non-E

certified 

St. Louis City 2104008220 Stationary Source Fuel Combustion Wood Residential Woodstove: fireplace inserts; EPA certified; non-catalytic St. Louis City 2104008230 Stationary Source Fuel Combustion Wood Residential Woodstove: fireplace inserts; EPA certified; catalytic St. Louis City 2104008310 Stationary Source Fuel Combustion Wood Residential Woodstove: freestanding, non-EPA certified St. Louis City 2104008320 Stationary Source Fuel Combustion Wood Residential Woodstove: freestanding, EPA certi

non-catalytic 

St. Louis City 2104008330 Stationary Source Fuel Combustion Wood Residential Woodstove: freestanding, EPA certi

catalytic 

St. Louis City 2104008400 Stationary Source Fuel Combustion Wood Residential Woodstove: pellet-fired, general (freestanding or FP insert) St. Louis City 2104008510 Stationary Source Fuel Combustion Wood Residential Furnace: Indoor, cordwood-fired, no

EPA certified 

St. Louis City 2104008610 Stationary Source Fuel Combustion Wood Residential Hydronic heater: outdoor St. Louis City 2104009000 Stationary Source Fuel Combustion Fire log Residential Total: All Combustor Types St. Louis City 2104011000 Stationary Source Fuel Combustion Kerosene Residential Total: All Heater Types St. Louis City Total Combined St. Louis County and St. Louis City Total 
B-14 

Table B-5 

2008 Area Source CO Emissions Summary for St. Louis County and St. Louis City 

Geographic Area 

2008 Area Source CO Emissions 

(Tons/Average Winter Day) 

St. Louis County 52.33 

St. Louis City 17.93 

Totals 70.26 

Table B-6 

SCC Codes and Descriptions for Marine and Rail Source Categories Not Included in the 

Analysis for Area Source Emissions 

SCC SCC Level One SCC Level Two SCC Level Three SCC Level Four 

2280002100 Mobile Sources Diesel 

Marine Vessels, 

Commercial Port emissions 

2280002200 Mobile Sources Diesel 

Marine Vessels, 

Commercial Underway emissions 

2285002006 Mobile Sources Diesel 

Railroad 

Equipment 

Line Haul Locomotives: 

Class I Operations 

2285002007 Mobile Sources Diesel 

Railroad 

Equipment 

Line Haul Locomotives: 

Class II / III Operations 
B-15 

Appendix B-3 On-Road Mobile Source Emissions 

EPA released the Mobile Vehicle Emission System (MOVES) in December of 2010, and 

MOVES is now the official model to use for mobile emissions modeling. Annual 2008 mobile 

emissions were initially created using Mobile6.2 via the National Mobile Inventory Model 

(NMIM) for Missouri for the purpose of submitting state wide emissions data for EPA’s 2008 

National Emissions Inventory (NEI). The NMIM National County Database (NCD) was updated 

with Missouri specific data. Local vehicle miles traveled (VMT) data, vehicle registration 

distributions, and meteorology data from the updated NCD were converted to MOVES 

formatting using EPA provided conversion workbooks. 

The emissions for 2008 were calculated using 2008 VMT data provided by the East West 

Gateway Council of Governments. The 2008 VMT data was originally generated from the 

Missouri Department of Transportation for state-owned roads, and then East-West Gateway used 

their Traffic Demand Model to calculate the actual local VMT data for each of the five counties 

on the Missouri side of the St. Louis Ozone nonattainment area. 

The road type distribution in the baseyearvmt table from the NCD was used to distribute the 

county level VMT to road type. EPA’s VMT converter workbook was then used to produce 

MOVES input tables. A vehicle registration distribution was originally created for NMIM using 

registration data from Missouri’s Department of Revenue. The vehicle distribution was 

converted to MOVES age distribution table using EPA’s VMT converter workbook. The 

registration data was also used to create the MOVES vehicle population input tables. Vehicle 

counts were converted from Mobile 6.2 vehicle classes to MOVES source types using the source 

type fractions from the Source Type Pop Fractions table in EPA’s VMT converter workbook. 

St. Louis City and St. Louis County both participate in the Gateway Vehicle Inspection Program 

(GVIP). For counties subject to Emission Inspection/Maintenance (I/M) Programs, MOVES 

allows for an I/M input table to be created to describe the program in those counties. An I/M 

input table was created to describe the GVIP for St. Louis City and St. Louis County. 

Development of the table was in accordance with EPA technical guidance on appropriate input 

assumptions and sources of data for the use of MOVES 2010 in State Implementation Plans 

(http://www.epa.gov/otaq/models/moves/420b10023.pdf). Documentation for the development 

protocol for the I/M input table can be found in Appendix A-6. 

MOVES base data was used for all other inputs, after reviewing the data to ensure accuracy. The 

base fuel supply tables in MOVES were used for the runs, as they already took into account the 

reformulated gasoline used in the St. Louis nonattainment area. A separate input database was 

created for each county, using county specific data where possible. All of the MOVES input 

tables, other than templates where EPA default data was used, which were used to create the 

2008 on-road mobile emissions inventory referred to in Section 3 of this CO Limited 

Maintenance Plan can be found in Appendix A. 

The MOVES model runs were set up selecting all available gasoline and diesel fuel vehicle type 

combinations, all months, days, hours, and all road types. A separate run was set-up for St. Louis 
B-16 

County and St. Louis City. The emissions were post-aggregated to the month level using 

MOVES. 

Once MOVES input tables had been created, MOVES 2010a was run and all months for 2008 

were selected to create an annual emissions profile. The emissions for the months of December, 

January, February, and March were totaled and divided by 122 days (2008 was a leap year), the 

number of days in those months, to give average winter day emissions 

Table B-7 summarizes the 2008 on-road emissions for the months of December, January, 

February, and March as calculated using MOVES 2010A for St. Louis County and St. Louis 

City. Table B-8 summarizes the average winter day emissions of CO for St. Louis County and 

St. Louis City. All of the MOVES inputs that were used to create the 2008 annual on-road 

mobile emissions inventory that were then used to generate the average winter day emissions can 

be found in Appendix A. 

Table B-7 

2008 On-Road Mobile Source Winter Month CO Emissions 

for St. Louis County and St. Louis City 

Geographic Area / Month 

2008 On Road Mobile Source CO Emissions 

(Tons) 

St. Louis County / January 15,077.55 

St. Louis County / February 12,011.11 

St. Louis County / March 11,845.30 

St. Louis County / December 12,975.47 

St. Louis County (Winter Total) 51,909.43 

St. Louis City / January 3,767.59 

St. Louis City / February 3,008.64 

St. Louis City / March 3,014.92 

St. Louis City / December 3,254.01 

St. Louis City (Winter Total) 13,045.15 

Table B-8 

2008 On-Road Mobile Source Average Winter Day CO Emissions 

for St. Louis County and St. Louis City 

Geographic Area 

2008 On Road Mobile Source CO Emissions 

(Tons/Average Winter Day) 

St. Louis County 425.49 

St. Louis City 106.93 

Totals 532.42 
B-17 

Appendix B-4 2008 Off-Road Mobile Source Emissions 

The Air Program Staff followed the 2008 and 2022 modeling protocol submitted by EPA Region 

7 to the Department for the development of the 2008 off-road mobile emissions with some 

exceptions. The Staff used 3.5% oxygen weight instead of 0.35% and 100% ethanol blend 

market instead if 10%. The EPA Region VII modeling protocol for 2008 and 2022 Off-Road 

Mobile Source Emissions in the St. Louis Nonattainment area can be found in Appendix B-6 of 

this document. The data generated by the Air Program Staff for the 2008 off-road mobile source 

emissions for St. Louis County and St. Louis City is summarized in Table B-9. 

Due to the methods that are used to calculate the emissions for the marine and rail categories, 

these categories are sometimes included as area source emissions, although they really should be 

classified as off-road mobile source emissions. Therefore, the emissions for rail and marine are 

not included in the total area source emissions. The 2008 emissions for marine, rail, and air 

sources are summarized for St. Louis County and St. Louis City in Table B-10. The total 2008 

off-road mobile source emissions for St. Louis County and St. Louis City are listed in Table B11. 

Table B-9 

2008 Off-Road Mobile Source Emissions for St. Louis County and St. Louis City 

(Tons/Average Winter Day) 

Area CO 

St. Louis County 207.36 

St. Louis City 38.26 

Totals 245.62 

Table B-10 

2008 Marine, Rail, and Air Emissions for St. Louis County and St. Louis City 

(Tons/Winter Day) 

Area CO 

St. Louis County 4.15 

St. Louis City 0.72 

Totals 4.86 

Table B-11 

Total 2008 Off-Road Mobile Source Emissions for St. Louis County and St. Louis City 

(Tons/Winter Day) 

Area CO 

St. Louis County 211.50 

St. Louis City 38.98 

Totals 250.48 
B-18 

Appendix B-5 Temporal Allocation Methodology Applied to 

Residential Fuel Combustion Area Source Categories 

The procedures summarized in this Appendix are based on the April 29, 2002 memorandum from 

Gregory Stella, U.S. EPA, “Temporal Allocation of Annual Emissions using EMCH Temporal Profiles” 

(http://www.epa.gov/ttn/chief/emch/temporal/temporal_factors_042902.pdf). 

Area Source categories for residential fuel combustion were calculated on an annual basis for 2008. 

Because residential fuel combustion takes place primarily in the winter months, as opposed to simply 

dividing the annual emissions by 365 to get average winter day emissions, these annual emissions were 

multiplied by a temporal allocation factor for an average day in January through the following calculation 

steps: 

The first step is to determine the monthly profile for the particular source classification code using EPA’s 

temporal cross reference file which can be found at the following website: 

http://www.epa.gov/ttnchie1/emch/temporal/. The next step is to correlate the monthly profile to a 

monthly profile factor for the month of interest as well as a total monthly profile factor using EPA’s 

temporal profile document, which can be found at the same website. In order to calculate the fraction of 

annual emissions for a particular month (January), the monthly profile factor for a specific month is 

divided by the total monthly profile factor: 

Fraction of Annual Emissions for January = (January Profile Factor / Total Monthly Factor) 

Then, in order to calculate the temporal allocation factor for an average monthly day, an average day per 

year is used in the calculation because the monthly profile factors are not weighted for the specific 

number of days in each month. So the temporal allocation factor for an average January day is calculated 

as follows: 

Temporal Allocation Factor for an Average Day in January = 

(Fraction of Annual Emissions for January) / (Days per Year (365) / Months per Year (12)) 

Example: 

Residential Bituminous/Subbituminous Coal Combustion (SCC = 2104002000) 

Monthly Profile for SCC 2104002000 = 485 

Monthly Profile 485: 

January Monthly Profile Factor = 190 

Total Monthly Profile Factor = 1002 

Fraction of Annual Emissions for January = 190 / 1002 = 0.189621 

Temporal Allocation Factor for an Average Day in January = (0.189621) / (365 / 12) = 0.0062341 

This temporal allocation factor can then be multiplied by the annual emissions of this SCC in order to 

calculate the emissions of this SCC for an average January day. Table B-12 gives the monthly profiles 

and the profile factors for all residential fuel combustion SCCs along with the calculated temporal 

allocation factors for an average January day.
B-19 

Table B-12 Calculation of Average January Day Temporal Allocation Factors for 

Residential Fuel Combustion SCCs 

SCC Monthly Profile # 

January Monthly 

Profile Factor 

Total Monthly 

Profile Factor 

Temporal Allocation 

Factor for an Average 

January Day 

2104002000 485 190 1002 0.0062341 

2104004000 485 190 1002 0.0062341 

2104006000 485 190 1002 0.0062341 

2104007000 262 83 996 0.0027397 

2104008100 485 190 1002 0.0062341 

2104008210 485 190 1002 0.0062341 

2104008220 485 190 1002 0.0062341 

2104008230 485 190 1002 0.0062341 

2104008310 485 190 1002 0.0062341 

2104008320 485 190 1002 0.0062341 

2104008330 485 190 1002 0.0062341 

2104008400 485 190 1002 0.0062341 

2104008510 485 190 1002 0.0062341 

2104008610 485 190 1002 0.0062341 

2104009000 485 190 1002 0.0062341 

2104011000 262 83 996 0.0027397 
B-20 

Appendix B-6 EPA Region 7 Off-Road Emissions Modeling Protocol 

for 2008 and 2022 for the St. Louis, Missouri-Five 

County Nonattainment Area 

 

For this modeling exercise, the EPA Region 7 utilized the NONROAD2008a model to calculate 

an ozone and PM2.5 nonroad inventory in five counties in the St. Louis nonattainment area for 

the 1997 PM2.5 annual and 1997 Ozone NAAQS. The NONROAD2008a model provides the 

emissions for all nonroad source categories except aircraft, commercial marine vessel, and 

railroad locomotive. 

In running the NONROAD model, the user must specify a modeling scenario by the inventory 

year, geographic area (nation, state, county), period (annual, seasonal, monthly, daily), and the 

equipment categories. For all other required variables, the NONROAD model provides default 

input values. For the following modeling exercises, fuel parameters (Reid Vapor Pressure 

(RVP), oxygen weight, sulfur content, ethanol volume and market percentage) and temperatures 

for each geographical area were provided by MDNR in lieu of the modeling default settings for 

more accurate results (see attachment). 

Ozone Precursor Emissions 

Ozone Methodology/Input Data 

Nonroad mobile source emissions for the years of 2008 and 2022 are calculated using the EPA 

approved model, NONROAD2008a, and included Franklin County, Jefferson County, St. 

Charles County, St. Louis County and St. Louis City in St. Louis, Missouri. 

For modeling ozone precursor pollutants, temperatures and fuel characteristics representative of 

each county during an ozone summer weekday, were entered into NONROAD2a and modeled to 

calculate an ozone season weekday emissions for nonroad sources. Minimum, maximum, and 

average temperatures for a typical summer season were provided by MDNR (see attachment). 

Modeling input parameters are as follows: 

Table B-13 

NONROAD Model Temperature & Fuel Characteristic Input Values by County 

County Oxygen 

Weight 

% 

RVP 

psi 

Gasoline 

Sulfur 

% 

Diesel 

Sulfur 

Marine 

Diesel 

Sulfur 

% 

CNG / 

LPG 

Sulfur 

% 

 Temperatures 

Min. Max. Avg. 

Franklin 0.35 7 0.0049 0.0355 0.0402 0.003 61.8 90 75.96 

Jefferson 0.35 7 0.0049 0.0355 0.0402 0.003 61 88.6 75.16 

St. Charles 0.35 7 0.0049 0.0355 0.0402 0.003 62.2 89.2 76.15 

St. Louis 0.35 7 0.0049 0.0355 0.0402 0.003 64.1 89.5 77.1 

St. Louis 

City 0.35 7 0.0049 0.0355 0.0402 0.003 65.1 89.8 77.72 
B-21 

Direct PM2.5 / PM2.5 Precursor Emissions 

Methodology/Input Data 

Nonroad mobile source emissions for the years of 2008 and 2022 were calculated using the EPA 

approved model, NONROAD2008a, and included Franklin County, Jefferson County, St. 

Charles County, St. Louis County and St. Louis City in St. Louis, Missouri. 

For modeling PM2.5 and PM2.5 precursor pollutants, temperatures and fuel characteristics 

representative of each county for each of the four seasons (winter, spring, summer, and fall) were 

entered into the NONROAD2008a model as input parameters. The highest temperature and 

lowest temperature from each three month period (December-February, March-May, JuneAugust, and September-November) were averaged to create a seasonal average temperature. 

Those seasonal average temperatures, seasonal minimum and seasonal maximum temperatures 

were then utilized in the model, including the fuel parameters, to calculate the total emissions for 

each county and season. Summing the emissions of all four seasons for each county gave the 

total annual emissions. The temperatures and fuel characteristics representative of each county 

were provided by MDNR. Modeling input parameters are as follows: 

Table B-14 

NONROAD Model Temperature & Fuel Characteristic Input Values by County & Season

County Season Oxygen 

Weight 

% 

RVP 

psi 

Gasoline 

Sulfur 

% 

Diesel 

Sulfur

Marine 

Diesel 

Sulfur 

% 

CNG 

/ LPG 

Sulfur 

% 

Temperatures 

Min. Max. Avg.

Franklin Winter 0.35 11.5 0.0043 0.0355 0.0402 0.003 19.7 47 33.4 

Franklin Spring 0.35 9 0.0046 0.0355 0.0402 0.003 33.5 76.9 55.2 

Franklin Summer 0.35 7 0.0049 0.0355 0.0402 0.003 61.8 90 75.9 

Franklin Autumn 0.35 9 0.0046 0.0355 0.0402 0.003 34.3 80.9 57.6 

Jefferson Winter 0.35 11.5 0.0043 0.0355 0.0402 0.003 18.6 45.6 32.1 

Jefferson Spring 0.35 9 0.0046 0.0355 0.0402 0.003 32.4 75.8 54.1 

Jefferson Summer 0.35 7 0.0049 0.0355 0.0402 0.003 61 88.6 74.8 

Jefferson Autumn 0.35 9 0.0046 0.0355 0.0402 0.003 33.6 79.8 56.7 

St. Charles Winter 0.35 11.5 0.0043 0.0355 0.0402 0.003 18.7 43.9 31.3 

St. Charles Spring 0.35 9 0.0046 0.0355 0.0402 0.003 32.3 75.8 54.1 

St. Charles Summer 0.35 7 0.0049 0.0355 0.0402 0.003 62.2 89.2 75.7 

St. Charles Autumn 0.35 9 0.0046 0.0355 0.0402 0.003 34.8 80.3 57.6 

St. Louis Winter 0.35 11.5 0.0043 0.0355 0.0402 0.003 19.8 44.2 32 

St. Louis Spring 0.35 9 0.0046 0.0355 0.0402 0.003 34.5 76.1 55.3 

St. Louis Summer 0.35 7 0.0049 0.0355 0.0402 0.003 64.1 89.5 76.8 

St. Louis Autumn 0.35 9 0.0046 0.0355 0.0402 0.003 35.5 80.2 57.9 

St. Louis 

City Winter 0.35 11.5 0.0043 0.0355 0.0402 0.003 20.7 45.5 32.6 

St. Louis 

City Spring 0.35 9 0.0046 0.0355 0.0402 0.003 35.7 76.4 56 

St. Louis 

City Summer 0.35 7 0.0049 0.0355 0.0402 0.003 65.1 89.8 77.5 

St. Louis 

City Autumn 0.35 9 0.0046 0.0355 0.0402 0.003 36.6 80.4 58.5 
B-22 

QA/QC 

Quality control and quality assurance were conducted throughout this nonroad modeling process. 

Data collected from various data sources were verified and correctly entered or transcribed into 

the model. In some instances, input values, i.e., temperatures and fuel values were double 

and/or triple checked for accuracy to insure they corresponded to the data supplied by MDNR. 

In addition, a spot-checking of the modeling results, including rerunning the model for those 

results in question, was performed to insure reliability.