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# National Ambient Air Quality Standards

AQPSTR 10-05

September 7, 2010

Illinois Environmental Protection Agency 1

021 North GrandAvenue East Springfield, Illinois 62794-9276TABLE OF CONTENTS

LIST OFTABLES

. LIST OFFIGURES

. EXECUTIVE SUMMARY
1.0



### 2.0 3.0

4.0

5.0

6.0



### 7.0 INTRODUCTION 1.1 Regulatory Background 1.2 Status ofAir Quality

. REDESIGNATION AND MAINTENANCE PLAN REQUIREMENTS PM2.s MONITORING 3.1 Monitored DesignValues 3.2 Quality Assurance 3.3 Continued Monitoring EMISSIONS INVENTORY. 4.1 Attainment Year Inventory 4.2 Air Quality Improvements and Emissions Controls 4.3 Emissions Projections. 4.4 Demonstration ofMaintenance 4.5 Provisions for Future Updates CONTROLMEASURES AND REGULATIONS 5.1 Control Measures 5.2 Reasonable FurtherProgress (RFP) and Reasonably Available Control Technology (RACT)

. 5.3 Controls to Remain in Effect

. 5.4 5.5 Provisions for PermittingNew or Modified Emissions Sources Transportation Conformity CONTINGENCY MEASURES 6.1 ContingencyMeasures 6.2 Commitment to Revise Plan 6.3 Public Participation 6.4 Legal Authorityto Implement and Enforce CONCLUSIONS Page

111

IV 5
6 6 8 9 11 11 12 12 14 14 15 16 16 18 19 19 

### 20 20 21 21
23 23 

### 25 25 26
27

### TABLE OF CONTENTS (Continued)



### APPENDIX A Summary ofAmbient Air Monitoring Data (2007-2009) APPENDIXB Transportation Conformity

11 

### 28 30

### LIST OFTABLES Page Table 4.1 2008 PM2.5, NOx and S02 

### Emissions

. 15 Table 4.2 2002 PM2.5, NOx and S02 Emissions

. 15 Table 4.3 2015 PM2.5, NOx and S02 Emissions. 16 Table 4.4 2020 PM2.5, NOx and S02Emissions

. 17 Table 4.5 2025 PM2.5, NOx and S02 Emissions

. 17 Table4.6 Comparison of2008, 2015, 2020 and 2025 Emissions 17 Table 5.1 Proposed 2008 and 2025 MotorVchicle Emissions Budgets Chicago Nonattainment AreaPM2.5 

### Maintenance Plan. 22 Table 6.1 Contingency Plan for the Chicago PM2 .s 

### Nonattainment Area 24

l11Figure 1.1 Figure 3.1 Figure 3.2 LIST OF FIGURES
Chicago PM2.s Nonattainment Area

. PM2.s Monitors in the Chicago Nonattainment Area

. Comparison ofPM2.5 Design Values for the Chicago Nonattainment AreaBetween 2000-2002 and 2007-2009

IV Page
7 11

13EXECUTIVE SUMMARY This document describes Illinois' Maintenance Plan for the Illinois portion ofthe Chicago fine particulate matter (PM25) nonattainment area (NAA), hereafterreferred to as the Chicago NAA. An approved Maintenance Plan is required before an area can be redesignated from nonattainment to attainment ofaNational Ambient Air Quality Standard (NAAQS). This document provides technical information required to support a request to redesignate the Chicago NAA to attainment ofthe 1997 annual PM2.5 NAAQS. The IndianaDepartment ofEnvironmental Management (IDEM), has prepared a similar plan for the Indianaportion ofthe Chicago NAA. PM2.5 air quality has improved in the Chicago area as aresult ofthe implementation of State and Federal emissions control measures since the designation ofthe area as nonattainment in 2004. The air quality improvement is due to permanent and errforceable emissions controlmeasures. The entire Chicago NAA has at least three years of complete, quality assured ambient air quality monitoring data for 2007-2009 that demonstrates compliancewith the 1997NAAQS. The U.S. EPA has made a determination that the Chicago NAAhas attained the 1997 fine particle standard (40 CFR 52.74, p. 62243-62249). This Maintenance Planprovides for continued attainment ofthe 1997 PM2.5 air quality standards for the Chicago nonattainment area for aperiod ofat least ten years afterU.S. EPA has formally redesignated the area to attainment. The Plan also provides assurances that, even ifthere is a subsequent violation ofthe air quality standard, contingency measures listed inthe Planwill be triggered to prevent any future occurrences. Finally, the Plan includes on-road motor vehicle emissionsbudgets for the years 2008 and 2025 for use in transportation conformitydeterminations to assure that any increases in emissions from this sector do notjeopardize continued attainment ofthe PM2.5 standards during the maintenance period.



### 51.0 INTRODUCTION The Illinois Environmental Protection Agency (Illinois EPA) has prepared this docmnent to describe Illinois' PM2.5 Maintenance Plan for the Chicago NAA. This Maintenance Plan is required before the area canberedesignated from nonattainment to attaimnent of the annual National Ambient Air Quality Standard (NAAQS) for PM2.5 promulgatedby the U.S. EnvironmentalProtection Agency (U.S. EPA) in 1997. The Illinois EPA intends to submit such a request to the U.S. EPA in conjunction with this MaintenancePlan. The entire Chicago nonattainment area, including Lake and Porter counties in Indiana, has at least three years ofcomplete, quality assured ambient air qualitymonitoring data for the most recent 3-yearperiod, 2007-2009, demonstrating attainment ofthe annual PM25 NAAQS promulgated in 1997. U.S. EPA finalized its determination that the entire Chicago NAA attains the 1997 PM2.5NAAQS in November 2009. This document provides the technical information needed to support a request to redesignate the Chicago area to attainment ofthe 1997 annual PM2
.5 NAAQS. Section 107 ofthe Clean Air Act (CAA) establishes specific requirements to be met in order for a nonattainrnent area to be considered for redesignation. Before an area canbereclassified to attainment:

o U.S. EPAmust make a determinationthat the area has attained theNAAQS based on at least tlu·ee complete years ofambientmonitoring data.

o U.S. EPAmust have approved a State ImplementationPlan (SIP) for the area under Section 110 and PartD ofthe CAA. • The state must demonstrate that the improvement in air quality is due to permanent and enforceable reductions in emissions resulting from implementation ofthe SIP and other federal requirements.

e The state must submit, and U.S. EPA must approve, a MaintenancePlanunder Section 175(A) ofthe CAA, including provisions for contingencymeasures that willbe implemented iffuture violations ofthe NAAQS are measured. This Maintenance Planprovides for the continued attainment ofthe annual PM2.5 NAAQS for the Chicago NAA for a period ofat least ten years after U.S. EPAhas formally redesignated the area to attainment. The Plan also provides assurances that even ifa subsequent violation ofthe annual PM25 NAAQS occurs, provisions inthe Plan will prevent any future occurrences through the enactment ofcontingencymeasures that wouldbetriggered upon such occurrence. This document addresses the Maintenance Planrequirements established by the CAA and U.S. EPA, and includes additional information to support continued compliance with the PM2.s NAAQS. 1.1 Regulatory Background The CAArequires areas that fail to meet the NAAQS for PM2

### .s to develop SIPs to expeditiously attain and maintain the NAAQS. Historically, one-year exceedances ofthe annual PM2.5 NAAQS have been monitored as recently as 2007 at one monitor in Cook County, but all monitors in the NAA are now in attainment ofthePM2.s NAAQS.

6The Chicago NAA, whichincludes all ofCook, DuPage, Kane, Lake, McHenry and Will counties, as well as portions ofGrundy and Kendall counties, was originally designated as nonattainment ofthe 1997 annual PM2
.5in2004

. The Chicago areawas designated unclassifiable/attainmentfor the 24-hour PM2

.sstandard that was also promulgatedin 1997,andrevised in 2006. Sincethe Chicago areaisnota nonattainment areafor the 24- hour PM2. 5NAAQS, anyreference to the PM2
.5NAAQS inthe remainder ofthis documentrefers onlytothe annual PM2
.5standardpromulgated in 1997

. Figure 1.1 depicts the currentChicagoNAA. 

### Figure 1.1- Chicago PM2.5 Nonattainment Area Chicago PM2.5 Nonattainment Area

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7The following is a list ofthe counties contained in the Chicago PM2.5 nonattainment area:

• Cook County, IL • DuPage County, IL • Kane County, IL • Lake County, IL • McHenry County, IL • Will County, IL • Aux Sable and Goose Lake Townships in Grundy County, IL, and • Oswego Township in Kendall County, IL

As aresult ofthe nonattainment designation, this area was subject to new requirements, including development ofan attainment strategy thatwould allow the area to meetthe federal PM25 NAAQS byJune 15,2010. The attainment strategyrecognizes the importance ofreducing both locally-generated as well as incoming (transported) PM2.5 and precursor emissions. State and Federal emissions control measures have reduced primary and secondaryPM2.5 emissions both locally and regionally and have enabled the Chicago NAA to attain the PM2.5 NAAQS bythe attainment deadline establishedbythe U.S. EPA 1.2 Status ofAir Quality 

### PM 25 monitoring data for themost recent three-yearperiod, 2007 through 2009, demonstrates that air quality has metthe 1997 PM2.5 NAAQS inthe Chicago NAA. Information regarding the air monitoring network and air qualitymonitoring data is included in Section 3.0 and Appendix 

### A.

82.0 REDESIGNA TION AND MAINTENANCE PLAN REQUIREMENTS Sections 107 and 110 ofthe CAA list a number ofrequirements that mustbe met by nonattainment areas prior to consideration for redesignation to attainment. One ofthose requirements is the development ofa Maintenance Plan, which describes a state's plan for maintaining the NAAQS for a minimum ten-year period after redesignation. The lllinois EPA developed this Maintenance Plan according to the guidance publishedbythe U.S.EPA entitled "Procedures for Processing Requests to Redesignate Areas to Attainment" (September 4, 1992). Before a redesignation to attainment can be promulgated, U.S. EPA must:

• Determine that the NAAQS for PM25 , as published in 40 CFR 50.4, hasbeen attained. PM25 monitoring data must show that violations ofthe NAAQS are no longer occurring. This showing must rely on three consecutive years ofdata. The ambient air monitoring data must be quality assured in accordance with40 CFR 58.10, recorded in U.S. EPA's Air Quality System (AQS) database, and made available to the public. U.S. EPAhas already finalized and published a finding that the area has, in fact, attained.theNAAQS. This finding was published in the Federal Register in November2009.

• Approve the state's plan for demonstrating attainment. The attainmentplan, which is based on air qualitymodeling, must contain enforceable control measures and mustbe submitted as a revision to the state's SIP after a public hearing.

• Determine that the improvement in air qualitybetween the yearviolations occurred and the year that attainment was achieved is based onpermanent and enforceable emissions reductions.

• Approve the state'sMaintenance Plan. The requirements for the Maintenance Plan are discussed below.

• Determine that all otherrequirements applicable to the nonattainment area have beenmet. A PM25Maintenance Plan provides for the continued attainment ofthe PM2.5 NAAQS for a nonattainment area for a period ofat least ten years after U.S. EPA has formally redesignated the area to attainment. To be approvable, the state is required to have a public hearing onthe Maintenance Planpriorto adoption. The Maintenance Plan must contain the following elements:

s A comprehensive "attainment year" emissions inventory ofprimaryPM2.5 and the precursors ofsecondaryPM25 : oxides ofnitrogen (NOx) and sulfur dioxide (S02);

9• A projection ofthe emissions inventory forward to a year at least ten years after redesignation and a demonstration that the projected level ofemissions is sufficient to maintain attaimnent ofthe PM25 NAAQS;

• A commitment that, once redesignated, the state will continue to operate an appropriate monitoring networkto verify maintenance ofthe attainment status;

• A demonstration oflegal authority to implement and enforce all control measures contained in the SIP;

• Provisions for future updates ofthe inventoryto enable tracking ofemissions levels, including an annual emissions statement from major sources;

• Motor vehicle emissions budgets for transportation conformity for the ten-year maintenanceperiod;

• A commitment to submit a revised MaintenancePlan eightyears after redesignation;

• A commitmentto enact and implement additional contingencymeasures expeditiouslyinthe eventthat future violations ofthe NAAQS occur; and

• A list ofpotential contingencymeasures that wouldbe implemented in such an event. This MaintenancePlanhas beenprepared in accordance withthe requirements specified inU.S. EPA's guidance document and additional guidance received from U.S. EPA staff. The following sections ofthis document describe how U.S. EPA'srequirements have been met.

10

### 3.0 PM2

.sMONITORING U

.S. EPA's published guidance document, "Procedures for Processing Requests to Redesignate Areas to Attainment" (September4, 1992), details specific requirements regarding the collection and use ofambient airmonitoring dataneededto support a redesignationrequest. Before the Chicago NAAcanbe redesignated, Illinois must demonstrate that the PM2.5 NAAQS has beenattained

. PM2.5 monitoring datamust show thatviolations oftheNAAQS are no longer occurring withinthe nonattainment area. This showing mustrely on three complete, consecutive calendaryears ofquality assured data

. Further, the airmonitoring datamustbequality assured in accordance with40 CFR 58.10, recorded in U

.S

. EPA's AQS database, and made available to the public

.As previously mentioned, U.S.EPA has made a finding that the ChicagoNAAhas metthese requirements and is attaining the 1997 PM2.sNAAQS

. Finally, Illinois mustcommitto continueto operate an appropriate monitoring networkto verify the maintenance ofthe attainment status, once the area has beenredesignated

. The following subsections describehoweachofthese requirements hasbeenaddressed. 3.1 Monitored DesignValues Currentlythere are 19PM2

### .s monitors located inthe nonattainment counties inthe Illinois portionofthe Chicago nonattainment area. Figure 3.1 showsthe locations ofthese monitors. 

### Figure3.1

- PM2.s Monitors intheChicago NonattainmentArea

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.To determine whether the NAAQS has beenmet, the annual PM2.5 design value has been calculated for the 3-year period, 2007-2009. The current U.S. EPAmethod for calculating the annual PM2.s design value is to average each monitor's annual average values over a 3-yearperiod and compare the calculated design values to the 15.0 microgram per cubic meter level ofthe NAAQS. The calculated annual PM2.5 design values for the monitors in the Chicago NAA for 2007-2009 are included as Appendix A ofthis report. Figure 3.2 compares the design values for 2000-2002, when the area was initiallyrecommended for designation as a nonattainment area, and the 2007-2009 period for monitoring stations in the Chicago region. The comparison shows that PM2.5 air qualityhas improved considerably since 2000-2002 throughout the Chicago NAA. The 2007-2009 data shows that the design values at all monitoring sites arc less than the level ofthe annual PM2.s NAAQS, demonstrating that the area attains the mmual PM2.s air quality standard. 3.2 QualityAssurance The Illinois EPAhas quality assured all monitoring data shown in Appendix A for all sites located in Illinois in accordance with 40 CFR 58.10 and the Illinois EPA's Quality Assurance Plan, which describes Illinois EPA's standard operating procedures for operating the ambient monitoring network and validating the data. The Illinois EPAhas recorded the monitoring data in the U.S. EPA's AQS database, which is available to the public. 3.3 Continued Monitoring Illinois commits to continue monitoring PM2.5 levels according to a U.S. EPA approved monitoringplan, as required to ensure maintenance ofthe PM2.s NAAQS. Should changes in the location ofa PM2.5 monitorbecome necessary, the Illinois EPA will work with U.S. EPA to ensure the adequacy ofthe monitoring network. The Illinois EPA will continue to quality assure the monitoring data to meet the requirements of40 CFR 58. The Illinois EPAwill continue to enter all data into AQS on a timelybasis in accordance with federal guidelines.

12

### Figure 3.2- PM2

.sDesignValues forthe Chicago NonattainmentArea Between 2000-2002 and 2007-2009

2000-2002 Design Values 2007-2009 DesignValues

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13

### 4.0 EMISSIONS INVENTORY A redesignation request must contain a demonstration that the improvement in air quality between the year that violations occurred and the year that attainment was achieved is based on pe1manent and enforceable emissions reductions. As described previously in Section 3.0, a three-year monitoring period is used to evaluate whether actual air quality attainment has been achieved. In this Section, the "attainmentyear" refers to the midpoint year (2008) ofthe three-year period (2007-2009) used to demonstrate attaimnent. As required byU.S.EPA redesignation guidance, this request also includes a projection ofthe emissions inventory to a year at least l0 years following redesignation, a demonstration that the projected level ofemissions is sufficient to maintain the PM25 NAAQS, and a commitment to provide future updates ofthe inventory to enable tracking ofemissions levels during the 1 0-year maintenanceperiod. 4.1 Attai1nnent Year Inventory The Illinois EPAhas prepared a comprehensive emissions inventory for the Chicago PM2.5 nonattainment area, including point, area, and on-road and off-road mobile sources for primary PM2.5 as well as precursors ofPM2.5 (NOx and S02) for the year 2008. The Illinois EPA selected 2008 emissions data to represent the "attainment year" since it is the middle year ofthe 3-yearperiod (2007-2009) which demonstrates monitored attainment. This inventoryis based on actual activity levels. Point source information was compiled from 2008 Annual Emissions Reports (AERs) submitted to the Illinois EPAby emissions sources. Area source emissions were calculated using the most recently available methodologies and emissions factors from U.S. EPA along with activity data (typicallypopulation, employment, fuel use, etc.) specific to 2008. On-road mobile source emissions were calculatedusing U.S. EPA'sMOBILE6.2 emissions model with 2008 vehicle miles traveled (VMT) dataprovidedbythe Illinois Department of Transportation (IDOT). Off-road mobile source exhaust emissions, such as those from lawn and garden equipment, agricultural equipment, and construction equipment were calculated for summer2008 using U.S. EPA'sNONROAD emissions model. Emissions sources such as commercial marine vessels, locomotives and aircraft were not included in the NONROAD model and were calculated separately. Biogenic emissions were not included inthese summaries. Table 4.1 summarizes the 2008 emissions estimates for the Chicago PM2.5 nonattainment area. Table 4.1 2008 PM2.5, NOx, and S02Emissions (tons per year) Source Category PM,.s NOx 

## so, Point Sources 3,859 35,939 90,706 Area Sources* 9,189 32,318 4,109 On-Road Mobile Sources 1,816 99,627 575 Off-Road Mobile Sources 3,653 51,184 779 Total 18,517 219,068 96,!69 *does not mclude fugitive dust emisswns from conshuctwn (res1dent1al, road and other) and agricultural tilling

144.2 Air Quality Improvements and Emissions Controls The Chicago area was designated as nonattainment ofthe 1997 PM2.5 NAAQS in 2004. Since that time, permanent and enforceable reductions ofprimaryPM2.5 and secondary PM2.s precursor emissions have contributed to improvements in PM2.5 air quality and to the attainment ofthe PM2.s NAAQS. Some ofthese emissions reductions were due to the application oftighter federal emissions standards onmotor vehicles and fuels, and some due to the requirements ofthe federal NOx SIP Call. Section 5.0 ofthisreport describes these reductions inmore detail, along with an explanation oftheirregulatory status. In this subsection, the 2008 attainment year emissions levels are comparedto the base year 2002 emissions levels. The U.S. EPA'sPM2.5 Emissions Inventory Guidance requires that states with PM2.s nonattainment areas prepare and submit a 2002 base year inventory ofanthropogenic sources ofdirect PM2.5 and precursors ofsecondaryPM25 emissions, namelyNOx and S02• This base year inventory included emissions from point, area, on-road mobile and off-road mobile emissions. The Illinois EPAprepared and submitted this inventoryin May 2006. Table 4.2 summarizes 2002 emissions bymajor source category and by pollutant for the Chicago NAA.

Table 4.2 2002 PM2.s NOx, and S02 Emissions (tons peryear) Source Category PM2.s NOx S02 Point Sources 2,757 54,050 121,598 Area Sources 8,441 32,325 3,290 On-Road Mobile Sources 3,071 167,620 3,850 Off-Road Mobile Sources 4,834 87,426 3,743**c~~~------~~~~--~** Total 19,103 341,421 132,481

An updated methodologywas usedto calculate residential wood combustion emissions in 2008. In order to be able to compare 2002 emissions to 2008 emissions, the original 2002 estimates were revised using the updated methodology. Comparing the 2002 inventoryto that for 2008 indicates that the total direct PM2 5 emissions inthe Chicago area were reduced by approximately 580 tons per year. NOx emissions in the Chicago area decreased significantly, about 122,300 tons per year, during the same time period. Thesereductions wereprimarily from on-road and off-road mobile sources. S02 emissions in the Chicago area decreased by about 36,300 tons per year, due largelyto reductions from point sources. These sizeable emissions reductions in direct PM2.5 emissions and secondaryPM2.5 precursor emissions, as well as corresponding reductions in upwind areas in Illinois and othernearby states resulted in a substantial improvement inPM2.5 air quality in the Chicago area, ultimatelyresulting in attainment ofthe 1997 PM2.s NAAQS.

154.3 Emissions Projections A MaintenancePlan must contain a demonstration that the level ofemissions projected for theten-yearperiod following redesignation are sufficientto maintainthe NAAQS. Accordingly, Illinois EPA has projected PM2 5, NOx, and S02 emissions for the Chicago NAA for 2.025. Illinois EPA has also projected emissions to 2.015 and 2020 to represent midpoint years during the maintenance period. Emissions for these projection years are compared to emissions levels in 2008 to determine ifemissions are sufficient to maintain the NAAQS during this period. Chicago areapoint and area source emissions for 2.015, 2.020, and 2.025 were estimated using the 2008 base year inventory and growth factors appropriate for each source category. The effect ofIllinois' recently adopted NOx RACT requirement on NOx emissions in future years was estimated and applied, as appropriate, to the point source inventory. Off-road emissions projections were developed using the growth factors contained in U.S. EPA's NONROAD model. On-roadmotor vehicle emissions were estimated using U.S. EPA'sMOBILE6.2 motorvehicle emissions model. The figures assume the continued usc ofrefonnulated gasoline, the continuedphase-in ofthe Tier 2. motorvehicle emissions standards, and operation ofan enhanced vehicle inspection and maintenanceprogram. Total vehicle miles oftravel (VMT) for 2015, 2020 and 2.025 were assumed to increase at arate of1.5 percent peryear from 2008. Tables 4.3, 4.4 and 4.5 include the direct NOx, PM2.5 and S02 emissions estimates for the years 2015,202.0 and 2025 respectively, for the Chicago nonattainment area. Table 4.3 2015 PM2 5 NOx, and S02 Emissions (tons peryear)

. ' Source Category PMz.s NOx SOz Point Sources 4,169 27,082 58,092. Area Sources 9,676 32,997 4,266 Ou-Road Mobile Sources 1,2.31 49,746 651 Off-RoadMobile Sources 2.,995 35,927 866 Total 18,071 145,752 63,875

4.4 Demonstration ofMaintenance Table 4.6 provides a comparison ofemissions for the years 2008, 2015, 2020, and 2025. The table demonstrates that the level ofemissions projected through the maintenance period are less than emissions estimated for the attainment year and are, therefore, sufficient to maintain the PM2.5 NAAQS. As shown in the table, both S02 and NOx emissions within the nonattainment area are expected to decrease significantlybetween 2.008 and 202.5 with PM25 decreasing slightly. Projected emissions ofthose pollutants for the mid-point years of2015 and 2020, are also less than theirrespective emissions levels in 2008. Based on these emissions trends it is expected that air quality will continue to meet the PM2.5 NAAQS throughout the maintenanceperiod.

16PMz.s NOx SOz Table4.4 2020 PM, 5 NOx, and SO, Emissions (tons peryear)



### .. , 

## - Source Category PMz.s NOx SOz Point Sources 4,391 28,499 53,452 Area Sources 10,009 33,277 4,332 On-RoadMobile Sources 1,043 29,102 681 Off-Road Mobile Sources 2,398 28,271 919 Total 17,841 119,149 59,384

Table 4.5 2025 PM2 5 NOx, and S02 Emissions (tons peryear)

.. , Source Category PMz.s NOx SOz Point Sources 4,604 29,638 56,310 Area Sources 10,377 33,687 4,407 On-Road Mobile Sources 1,064 23,687 734 Off-RoadMobile Sources 2,267 27,173 1,215 Total 18,312 114,185 62,666

Table4.6 Comparison of2008, 2015, 2020 and 2025 Emissions (Emissions stated in tons per year) 2008 2015 2020 2025 Decrease Decrease (200&-2015) (2008-2020) 18,517 18,071 17,841 18,312 446 676 219,068 145,752 119,149 114,185 73,315 99,919

96,169 63,875 59,384 62,666 32,294 36,785 Decrease (2008-2025) 205 104,883 33,503

In addition to the overall emissions reductions projected to occur within the nonattainment area, significantreductions ofstatewide NOx and S02 emissions resulting from implementation ofIllinois' multi-pollutant standards affecting electric utilities during the maintenance period, will also help to ensure continued attainment ofthePM2.5 NAAQS. It should also benoted that the emissions projections included here do not reflect the reductions expected from a range ofmeasures being implemented to reduce diesel emissions inthe Chicago NAA. These measures havebeenfunded through sources such as the:

e U.S. EPA's Midwest Clean Diesel Initiative • CongestionMitigation and Air QualityImprovement (CMAQ) Program • Diesel Emissions Reduction Act (DERA)

17• American Recovery and Reinvestment Act of2009 • Various Supplemental Environmental Projects These projects include the installation ofparticulate filters, diesel oxidation catalysts, closed-crankcase ventilation systems, and direct-fired heaters on school aud transit buses, and municipally-owned utility vehicles, repowering diesel locomotive engines with generator sets, upgrading diesel construction engines with engines meeting more stringent emissions standards, aud installing auxiliary power units on over-the-road trucks to reduce idling. We anticipate DERA and CMAQ funding to continue to support additional diesel emissions reduction projects in the near future. 4.5 Provisions for Future Updates As required hy Section 175A(b) ofthe CAA, Illinois commits to submit to U.S. EPA, eight years after rcdesignation, arevised version ofthis Maintenance Plan. The revision will contain Illinois' plan for maintaining the 

### PM 25NAAQS for tcm years beyond the initial maintenanceperiod.

185.0 CONTROL MEASURES AND REGUI>ATIONS This sectionprovides specific infmmation on the control measures implemented in the Chicago NAA. These include CAA requirements, and other state and federal measures. These control measures have been fully promulgated, and will provide emissions reductions infuture years. Illinois EPA commits to keep these measures in effect after redesignation, orto maintain equivalent emissions levels using alternate measures. Illinois' SIP contains acceptableprovisions to provide for preconstmction review ofnew emissions sources. Afterrcdesignation to attainment, Prevention ofSignificant Deterioration (PSD) requirements will apply to the constmction ofnew major sources and to significant modifications ofexisting sources. Illinois has accepted delegation from U.S. EPA ofthis program. Illinois f·urther commits to continue to require that all future regional transportation plans for the Chicago area conform to the SIP. 5.I Control Measures A variety ofcontrol measures are in place that reduce emissions ofdirect PM2.5, NOx and S02, and have contributed to the attainment ofthe annual fine particle standard. The emissions reduction measures for demonstrating attainment ofthe PM2.5 standard are as follows:

• NOx SIP Call • New Source Performance Standards (NSPS) and National Emissions Standards for Hazardous AirPollutants (NESHAPS)/Maximum Achievable Control Technology (MACT) Standards • VOM Solvent Categories: Aerosol Coatings, Architectural and Industrial Maintenance (AIM) Coatings, Consumer Solvents • Vehicle Inspection & Maintenance Program • Reformulated Gasoline • Tier 2 MotorVehicle Emissions Standards and Gasoline Sulfur Control Requirements • On-HighwayHeavy-Duty Engine and Vehicle Standards and HighwayDiesel Fuel Sulfur Control Requirements • Federal Emissions Standards for Off-Road Equipment (e.g., Nonroad Diesel Engine Rule, Evaporative Large Spark Ignition and Recreational Vehicle Standards) incorporated into NONROAD Model • Tier4 Nonroad Diesel Engine Standards and Diesel Fuel Sulfur Content Restrictions • Marine Compression-Ignition Engine Standards and Locomotive Engine Standards • ConsentDecrees (Citgo and ExxonMobil)

19

### 5.2 Reasonable Further Progress (RFP) and Reasonably Available Control Technology (RACT) Since U.S. EPAhas published an attainment finding for the Chicago area for the 1997 PM25standard, the requirements for Illinois to submit an attainment demonstration, RACM, RFP, contingency measures, and any other planning SIP'srelated to attainment are suspended as long as the area continues to attain the 1997 PM2.5NAAQS. 

### 5.3 Controls to Remain inEffect Illinois will maintain all ofthe control measures listed in this Sectionto ensure maintenance ofthe annual PM2.5 NAAQS. Anyrevisions to the control measures included as part ofthe Maintenance Plan willbe submitted as a SIP revision to U.S. EPA for approval, and will be accompanied by a showing that such changes will not interfere withmaintenance ofthe NAAQS.
In addition to the control measures identified in subsection 5.1, additional control measures that will remain in effect are:

• NOxRACT, as a requirement for the 1997 ozone NAAQS attainment demonstration. • Multi-Pollutant Standard/Combined Pollutant Standards---Arneren, Midwest Generation, and Dynegy (35 Ill. Adm. Code Part 225) • VOC RACT (incomplete)

VOC RACT is incomplete at this time, since three CTG'shavebeen submittedto the Illinois Pollution Control Board, buthave notbeen submitted to the U.S. EPA. Though Illinois believes that control oforgm1ic compounds mayhelp improve PM air quality, we havenot relied on the control oforganics, consistent with the PM2.5ImplementationRule.
In addition, clean construction standards are inplace as part ofCook County Ordinance No. 

### 09-0-36, 5-19-2009 (Article IX, Section 

### 30-952) that mandates that contractors must use Ultra Low SulfurDiesel fuel in diesel vehicles, nonroad vehicles, and stationary generators for Cook County government projects exceeding $2 million. Furthetmore, by the start of

### 2014, anyprimary contractor working on a constructionproject in Cook County shall berequired to meet a PM emission reduction ofat least 85% from uncontrolled for any heavy duty diesel vehicle or diesel nouroad vehicle. This level of control ofdiesel vehicles mustbe met by subcontractors bythe stati 

### of20l6. This is not included as a contingencymeasure, but is further evidence ofcunent and future PM emissions reductions in the heart ofthe urban area. The O'Hare AirportModernization Program alreadyhas in place an Ultra Low Sulfur Diesel fuel requirement for all off-road dieselpoweredvehicles and equipment (both mobile and stationary) that are utilized on-site. (O'HareModernizationProject Site



### 20

### Preparation, Project No. OH6126.200.50.023, specification no. 35491) This requirement is in place for the remainder ofthe project. The Illinois EPA has the necessaryresources to enforce any violations ofits rules or permit provisions. After redesignation, it intends to continue enforcing all rules that relate to the emissions ofprimaryPM25 

### and precursors to secondaryPM25

### in the Chicago nonattainment area. 5.4 Provisions for PermittingNew or Modified Emissions Sources Illinois has longstanding and fully implemented programs for the review ofnew major sources and significant modifications ofexisting sources. The PSD program, which includes requirements for Best Available Control Technology (BACT) on major new sources or significant modifications ofexisting sources, will be applicable in the Chicago area oncethe area has been redesignated to attainment. Illinois has been delegated full authority to implement the PSD programbyU.S. EPA. 5.5 Transportation Conformity The purpow ofthis sectionis to describe and establishthe Chicago nonattainment area motor vehicle emissions budgets associatedwiththe PM2.5

### Maintenance Plan SIP. Annualmotor vehicle emissionsbudgets are being proposed for the attainment year, 2008, and for the final year oftheMaintenance Plan, 2025, for primaryPM2

_ 5 

### and the precursorpollutant NOx. TheMaintenance Plan also includes motorvehicle emissions estimates for the interim years 2015 and 2020 in order to demonstrate that total emissions remainbelow the 2008 attaimnent yem total; however, these interim year motor vehicle emissions estimates are notbeingproposed as formal motor vehicle emissionsbudgets. The proposed 2008 and 2025 motor vehicle emissions budgets were developed consistent withthe motorvehicle activity assmnptions and emissions control strategies incorporated into the 8-hour ozone Attainment Demonstration and Maintenance Plan SIPs. The budgets reflect an emissions level determined using actual motor vehicle VMT for 2008 and VMT growth at an annual rate of 1.5% from year 2008 levels to 2025. A motorvehicle emissions budget is that portion ofthe total allowable emissions allocated to highway and transit vehicle use that are defined in the SIP for a certain year. The rules governing transportation conformityrequire certain transportation activities to be consistent with motor vehicle emissions budgets contained in control strategy implementationplans (40 CFR § 93.118). Section 93.101 ofthe rule defines a "control strategy [State] implementation planrevision" as a "planwhich contains specific strategies for controlling the emissions and reducing ambient levels ofpollutants in order to satisfy CAArequirements ofreasonable further progress and attainment." In order to demonstrate conformityto the motor vehicle emissionsbudget, emissions from the implementation ofatransportation plan or atransportation improvementprogrammust be less than or equal to the budget level (40 CFR 

### § 93.118(a)), The motor vehicle emissions budgets established and described herein were developed

21consistent with the methodology and control strategy assumptions used in the PM2.5 attainment demonstration. The effects ofmotor vehicle control measures arc incorporated into the emissions factors producedby the U.S. EPA's MOBILE6.2 model. These control measures include the implementation ofnational motor vehicle emissions standards, the operation ofa vehicle inspection and maintenance (liM) program, and the required use ofreformulated gasoline and low sulfur gasoline and diesel fuel. Since the Chicago PM25 Maintenance Planhas been under development for several months, the MOBILE6.2 model is beingusedrather than the recently-released MOVES2010 model. The motorvehicle emissions budgets proposedherein will be updated using the MOVES2010 model withinthe allotted two-year grace period. Following is a discussion ofthe inputs and assumptions used inthe development ofthe motor vehicle emissions budgets. Themotor vehicle emissions budgets, whichreflect the VMT and control program assumptions and methodology described here, are listed in Table 5.1.



### Table 5.1 Proposed 2008 

### and 2025 

### MotorVehicle Emissions Budgets Chicago PM2.s 

### Maintenance Plan (tons per year)


### Year PMz.s NOx 2008 1,816 99,627 2025 1,064 23,687

Complete details on the derivation ofthe motorvehicle emissions budgets, including discussion ofthe MOBILE6 model inputs and assumptions are included in Appendix B ofthis report.

226.0 CONTINGENCYMEASURES 6.1 Contingency Measures Section 175(A) ofthe CAA specifies the requirements for Maintenance Plans, including provisions for contingencymeasures that will be implemented ifviolations ofthe annual PM25 NAAQS are measured after redesignationto attainment. A list ofpotential contingencymeasures that wouldbe implemented in such an event should also be included in the Maintenance Plan. Finally, the plan shouldprovide a commitment to submit arevised Maintenance Plan eight years afterredesiguation to ensure continued maintenance for the next ten-year maintenance period. Contingencymeasures are intendedto provide further emissions reductions in the event that violations ofthe annnal 

### PM 25NAAQS occur after redesiguation to attainment. While these measures do not need to be fully adopted bythe Illinois Pollution Control Board (IPCB) priorto the occurrence ofNAAQS violations, the contingencyplan should ensure that the contingencymeasures arc adopted expeditiously once they are triggered. The MaintenancePlanmust identifythe triggers that determine when contingency measures will be adopted, and the measures that the state will consider. Illinois EPA's contingencyplan for the Chicago NAA is described inTable 6.1. Consistent with this plan, Illinois agrees to adopt and implement, as expeditiously as practicable, the necessary corrective actions in the event that violations ofthe annual PM2

_ 5 NAAQS occur within the Chicago maintenance area after redesignation to attainment. As described in Section 5.0 ofthis report, Illinois has adopted and is continuing to implement arange ofcontrol measures that will greatlyreduce precursor emissions, both locally and statewide. Illinois commitsto continue to implement the identified control measures, although the Illinois EPA anticipates that these emissions reductions will be sufficient to mitigate exceedances orviolations ofthe NAAQS that may occurinthe coming years without further regulatory action. The contingencyplanprovides for different levels ofcorrective responses should ambient annual PM25 levels exceed the NAAQS in any year; ifemissions in the NAA increase significantly above current attainment levels; or ifthe NAAQS is violated. A Level I response would occurin the event that: 1) the average ofthe annual PM2

_ 5concentration for the three most recent years at any monitoring site inthe Illinois portion ofthe Chicago NAA exceeds 15 microgramsper cubic meter, or 2) iftotal PM25 , S02 or NOx emissions increase more than 5% above the levels contained in the attainment year (2008) emissions inventory. Ifexceedances ofthe annual PM2

_ 5NAAQS are observed in Lake and Porter counties in Indiana, Illinois commits to workwith the Indiana Department of Environmental Management (IDEM) to develop appropriate corrective measures. It shouldbe noted that U.S. EPA does notrequire a state to implement contingency measures when occasional exceedances are recorded. The Illinois EPA'svoltmtary commitment to initiate a Level I response is intended to prevent future violations ofthe NAAQS from ever occurring.

23Table 6.1 Contingency Plan for the Chicago PM2

### .s Nonattainment Area ContingencyMeasure Action to be Taken List ofPotential Contingency Measures Trigger Level I Trigger Point Source Measures IL will evaluate air quality, or 

### • IL Multi-Pollutant Programfor 

### • Highest monitored determine ifadverse emissions trends electric generating units PMz.s are likelyto continue. Ifso, IL will 

### • Phase II ofthe Clean Air concentration determine what and where controls Interstate Rule, after exceeding 15.0 may be required, as well as level of promulgationbyU.S.EPA ug/m**3 in any emissions reductions needed, to avoid a 

### • BestAvailable Retrofit year at any violation ofthe NAAQS. The study Technology (BART) monitoring station shall be completed within 9 months. If in the Chicago necessary, control measures shall be lVIobile Source Measures maintenance area. adopted within 18 months of 

### • Tier 2 Vehicle Standards and Low determination and implemented as Sulfur Fuel expeditiously as practicable, taking into 

### • Heavy Duty Diesel Standards and 

### • The Chicago consideration the ease of Low Sulfur DieselFuel maintenance area's implementation and the technical and 

### • High-enhanced I1M (OBD!l) total PM2.5, NOx economic feasibility ofthe selected 

### • Federal railroad/locomotive or S02 emissions measures. standards increase more than 

### • Federal commercial marine vessel 5% above the engine standards levels included in the 2008 emissions Area SourceMeasures inventories. 

### • Architectural/Induslrial Level II Trigger IL will conduct a thorough analysis to Maintenance (AIM) Coatings 

### • Commercial and Consumer 

### • A violation ofthe determine appropriate measures to Products NAAQS at any address the cause ofthe violation. Aerosol coatings 

### • monitoring station Analysis shallbe completed within 6 

### • Broader geographic applicability in the Chicago months. Selected measures shall be maintenance area. implemented within 18 months ofa ofexisting measures violation. 

### • Portable fuel containers

Illinois commits to compilingPM2.5, S02, andNOx emissions inventories for the Chicago area everytlnee years for the duration ofthe MaintenancePlanto facilitate the emissions trends analysis included in the contingencyplan underLevel I. The Illinois EPA will evaluate the causes ofhigh PM25 levels or the emissions trends and to determine appropriate control measures needed to assure continued attainment ofthe annual PM2.5 NAAQS. Under Level I, measures that could be implemented in a shmi time wouldbe selected so as to be inplace quickly after the Iliinois EPAis aware that corrective measures have been triggered. Control measures selected under Level I will be adopted in most cases within 18 months after a determination is made, and implemented, generally, within 24 months ofadoption bythe IPCB.
A Level II response would be implemented in the eventthat a violation ofthe annual PM2.5 NAAQS were to be measured at a monitoring site within the Chicago maintenance

24area (including sites in Indiana and Illinois). In order to select appropriate corrective measures, the Illinois EPA will work with IDEM to conduct a comprehensive study to determine the causes ofthe violation and the control measures necessaryto mitigate the problem. The analysis will examine the following factors:

• the location and severity ofthe ambient PM2.5 exccedances; • the weather patterns contributing to the elevated PM2

_ 5 levels; • potential contributing emissions sources; • the geographic applicability ofpossible contingency measures; • emissions trends, including timeliness ofimplementation ofscheduled control measures; • cunent and recently identified control technologies; and • air quality contributions from outside the maintenance area. Contingencymeasures will be selected from those listed in Table 6.1 or from any other measure deemed appropriate and effective at the time the selection is made. Itis expectedthat implementation ofonly a few ofthese measures would be necessary. The selectionbetween measures will bebasedupon cost-effectiveness, emissions reduction potential, ease and timing ofimplementation, and other appropriate factors. Implementation ofnecessary controls inresponse to a Level IItrigger will take place as expeditiously as possible, butin no event later than 18 months after the Illinois EPA makes a detennination, based on quality-assured ambient data, that a violation ofthe NAAQS has occurred. Adoption ofadditional control measures is subject to necessary administrative and legal processes. The Illinois EPAwill solicit input from all interested and affected persons in the area priorto selecting appropriate control measures. No contingencymeasure will be implemented withoutproviding the opportunity for full public participation. This process will includepublication ofnotices, an opportunity for public hearing, and other measures required byIllinois Jaw. 6.2 Commitment to Revise Plan As noted in Section 4.5 above, the Illinois EPA commitsto review its Maintenance Plan eight years after redesignation, as required by Section 175(A) ofthe CAA. The Maintenance Plan revision is intended to ensure continued attainment ofthe annual PM2.5 NAAQS for an additional ten-yearperiod. 6.3 Public Participation
In accordance with Section 11O(a)(2) ofthe CAA, the Illinois EPA is required to hold 

### a public hearingpriorto adoption ofthis Maintenance Plan and submittal to U.S. EPA. Public participation in the SJP process is provided for as follows:

25• Notice ofavailability ofthe Chicago PM2.5 Maintenance Plan document and the time and date ofthepuhlic hearing waspublished in the Chicago Sun-Times on June 11,2010.

• The public hearing to receive comments on the Chicago Maintenance Plan was held at 1:00 p.m. on July 14,2010 at the James R. Thompson Center, 100 West Randolph Street, in Chicago.

• A 30-daypublic commentperiod was open after the public hearing to receive comments on the Maintenance Plan. A summary ofthe comments received and Illinois EPA'sresponses thereto is included as part ofthe submittal to U.S. EPA. 6.4 Legal Authority to Implement and Enforce The Maintenance Planmust contain a demonstration that the State ofii!inois has the necessary legal authority to implement and enforce the measures relied upon to attain and maintain the NAAQS. Illinois has the legal authority to implement and enforce the requirements ofthis SIP submittal pursuant to the Illinois Environmental ProtectionAct.



### 267.0 CONCLUSIONS The Chicago nonattainment areahas attained the 1997 annual PM2.5 NAAQS and has complied with the applicable provisions ofthe CAA required ofPMz.s NAAs. Illinois has performed an analysis that demonstrates that the Chicago NAA has attained the 1997 annual PM2.5 NAAQS and believes the air quality improvements are due to permanent and enforceable control measures. Supporting docnmentation is containedherein. The Illinois EPA has prepared a MaintenancePlanthatmeets the requirement ofthe Clean Air Act This Maintenance Plan provides for the continued attainment ofthe 1997 annual PM2.5 NAAQS for a period ofat least ten years after U.S. EPA has formally redesignated the areato attainment This Maintenance Planprovides adequate contingencymeasures for potential, additional emissionsreductions inthe event that future violations ofthe 1997 annual 

### PM 25NAAQS are observed in the area. The Illinois EPA has prepared a comprehensive emissions inventory ofPM2.5 andits precursors for the "attainment" year, 2008, and has prepared projections ofthe emissions inventory to 2015, 2020 and 2025. These emissions projections indicate that emissions levels in the Chicago nonattainment area will decrease from the levels occurringinthe attainment year, thereby maintaining the PM2.5 NAAQS in future years. The Illinois EPA commits to continue to operate an appropriate air qualitymonitoring network to verify the maintenance ofthe attainment status once the areahasbeenredesignated. The Illinois EPAhas the legal authority to implement and enforce all control measures. Finally, the Chicago PM25 Maintenance Planincludes year 2008 and 2025 on-roadmotor vehicle emissionsbudgets for PM25 and NOx for use in transportation conformity determinations to assure that any increases in emissions from this sector do not jeopardize continued attaimnent ofthe annual PM2

### .s standard during the ten-year maintenance period. The Chicago Maintenance Planhas beenprepared in accordance with the requirements specified inU.S. EPA's guidance document, and additional guidance received from U.S. EPA staff.

27

## APPENDIX A Summary ofAmbient Air Monitoring Data (2007-2009)

28

### Table A.l 2007-2009 AnnualPM2

### .s 

### Design Values for Monitors in the Chicago Nonattainment Area

County Monitoring Site 

### 2007 2008 2009 Design**Val~~C__**

Cook Blue Island 14.3 12.5 11.7 12.8 Cook Chicago-ComEd 14.3 11.9 11.1 12.4**~-** Cook Chicago-Springfield 15.2 12.0 11.3**12-~~** Cook Chicago-Mayfair 15.5 12.2 12.7 13.5 Cook Chicago-SE Police 14.1 11.8 11.0 12.3 Cook Chicago-Washington 15.7 12.5 c---116 13.3 Cook Cicero 14.8 13.3 12.0 13.4 Cook Des Plaines 12.7 11.4 11.0 11.7 Cook McCook* 15.6 12.9 12.6 13.7 Cook Northbrook 13.2 10.1 9.3 10.9

. Cook SchillerPark* 15.4 13.6 12.9 14.0 Cook Summit 14.8 12.0 11.6 12.8 DuPage Naperville 13.8 11.3 9.8 11.6

Kane Aurora 13.2 10.3 10.0 11.2

. Kane Elgin 14.5 10.8 9.6 11.6 Lake Zion 11.9 9.3 8.8 10.0 McHenry Cary

--- '---11.6 10.1 9.6 10.4

- Will Braidwood 12.1 10.3 8.7 10.4 Will Joliet 14.6 11.7 10.5 12.3 Lake IN Franklin School 14.4 12.0 11.3 12.6 Lake IN Griffith 13.2 11.7 11.0 12.0 Lake IN Madison St. 14.6 12.3 12.1 13.0 Lake IN Hammond-Purdue 13.8 11.7 15.9 13.8 Lake IN C1arkHS 13.7 12.4 10.8 12.3 Porter IN Ogden Dunes 13.8 10.9 11.3**12.0~** *-Annual Standard does not apply atthese rnonitming sites Annual averages listed in underlined italicsbased on incomplete data.



### 29

## APPENDIXB Transportation Conformity

30TRANSPORTATION CONFORMITY

This section describes the development ofthe Chicago nonattainment area (NAA) motor vehicle emissions budgets associated with the PM2.5 Maintenance Plan State Implementation Plans (SIP). Annual motor vehicle emissions budgets are being proposed for the attainment year, 2008, and 2025, the final year ofthe initial maintenance period for direct motor vehicle PM2.5 emissions and for the precursor pollutant oxides of nitrogen (NOx). These budgets were developed consistent withthe motor vehicle activity assumptions and emissions control strategies incorporated into the PM2.5 maintenance plan analysis. The budgets reflect an emissions level determined using motor vehicle VMT and fleet mix providedbythe Chicago Metropolitan Agency for Planning (CMAP). Background Section 176(c)(4) ofthe Clean Air Act (CAA) Amendments of 1990 requires that transportation plans, programs, and projects which are funded or approved under Title 23 USC mustbe determined to conform with State orFederal air implementationplans. A motor vehicle emissions budget is thatportion ofthe total allowable emissions allocated to highway and transit vehicle use thatare defined inthe SIP for a certain year. Section 93.101 ofthe rule defines a "control strategy [State] implementationplanrevision" as a "plan which contains specific strategies for controllingthe emissions and reducing ambient levels ofpollutants in orderto satisfy CAArequirements ofreasonable further progress and attainment." In orderto demonstrate conformity to the motor vehicle emissions budget, emissions from the implementation ofa transportation plan or a transportation improvementprogram (TIP) mustbe less than or equal to the budget level (40 CFR § 93.118(a)). Transportation conformity willbebased onthese submitted on road motorvehicle emissions budgets after the U.S. Environmental Protection Agency ("U.S.EPA") determines that the budgets meet th0 adequacy criteria ofthe transportation conformity rule under §93.118(e). The motorvehicle emissions budgets inthis submittal are adequate as each ofthe six criteria under §93.118(e) is satisfied. These six criteria include: 1. The submitted control strategy implementationplanrevision or maintenance plan was endorsedbythe Governor (orhis orher designee) and was subject to a State public hearing. 2. Before the control strategy implementationplan ormaintenance planwas submitted to EPA, consultation among federal, State, and local agencies occurred: full implementation plan docmnentation was provided to [US]EPA; and [US]EPA's stated concerns, ifany, were addressed; 3. The motorvehicle emissionsbudgets(s) is clearlyidentified and precisely quantified;

31

### 4. The motor vehicle emissions budget(s), when consideredtogether with all other emission sources, is consistent with all applicable requirements for reasonable further progress, attainment, ormaintenance (whichever is relevant to the given implementation plan submission); 5. The motor vehicle emissions budget(s) is consistent with and clearlyrelated to the emissions inventory and the control measures inthe submitted control strategy implementation plan revision or maintenance plan, and 6. Revisions to previously submitted control strategy implementationplans explain and document any changes to previously submittedbudgets and control measures, impacts onpoint and area source emissions; any changes to established safety margins; and reasons for the changes (including the basis for any changes related to emission factors orestimates ofvehicle miles traveled). The Pl'vh5 

### attainment demonstration SIP and the associated motorvehicle emissions budgets have been developed bythe Illinois Envirom11ental ProtectionAgency (Illinois EPA), the designated air quality agency for the State oflllinois. Therequiredpublic hearing to acceptpublic comment on the proposed motor vehicle emissions inventory was held at 1:00PM, on July 14, 2010 in Room 9-040 ofthe James R. Thompson Center in downtown Chicago. Notification ofthis hearing was printed in the Chicago Sun Times on June 11, 2010. Comments on the proposed attainment demonstration and motor vehicle emissions budgets were accepted for 30 days after the publichearing. A "Responsiveness Summary" which addresses the comments received was included inthe final submission. In compliance with adequacy criterion#2, an interagency consultation meeting was held with members ofthe CMAP Tier 2 Consultation Team on June 25, 2010 in Chicago. At this meeting, the Illinois EPArepresentative discussed the requirements for the maintenanceplan as they relate to tr·ansportation conformity and explained the derivation ofthe proposed motorvehicle emissions budgets. Compliancewiththe remaining adequacy criteria is contained withinthe narrative ofthe attainment demonstration document and this transportation conformity section. The Chicago PM2.s 

### Maintenance Plan MotorVehicle Emissions Budgets The motor vehicle emissions budgetsproposed and described herein were developed consistent with the methodology and control strategy assumptions used in the development ofthe emissions estimates contained in the Chicago 

### PM 25 

### Maintenance Plan. The effects ofthese controls are incorporated into the emissions factors produced bythe U.S.EPA'sMOBILE6.2 model. Since the Chicago PM2.5 

### MaintenancePlanhas beenunder development for several months, the MOBILE6.2 model is being used rather than the recently-released MOVES2010 model. The motor vehicle emissions budgets proposed hereinwill be updated using the MOVES2010 model within the allotted twoyear grace period. Followingis a discussion ofthe inputs and assumptions used in the development ofthe motorvehicle emissions budgets.

32

### The attainment year 2008 motorvehicle emissions estimates contained Chicago PM2.5 

### Maintenance Plan incorporate county-and township-level2008 aunual vehicle miles traveled (VMT) levels from the IllinoisDepartment ofTransportation (IDOT). The 2008 annual VMT total for the 6-county-3-township Chicago NAA was approximately 58.8 million miles. For future year emission estimates, VMT was grown to the target year at a compound growthrate (CGR) of 1.5% per year. Applying this growth factor to the 2008 VMT level yields future year annual VMT projections of65.2 million for 2015,70.3 million for 2020, and 75.7 for 2025. Following is a summary ofthe infom1ation and MOBILE6.2 model assumptions used included in the development ofthe draft motor vehicle emissions budgets. Year: VMT estimates and motor vehicle emissions factors were developed representative of2008, 2015, 2020, and 2025 for the PM2

### .s maintenance demonstration. AnnualEmissions as 

### Sum ofMonthlyEmissions: The 2008 Chicago PM2

### .s MaintenancePlan emissions inventory is based on annual activity. Estimates ofmotor vehicle emissions were made for each month oftheyear, using average monthly information, and summed to get aunual emissions. Theprimaryparameters affected by the choice to calculate monthly emissions and sum then are the representative temperatures, fuel volatilities, and the estimation ofVMT for the various months to account for month-to-month changes in travel. Temperatures: 

### U.S. EPA guidance for the use ofthe MOBILE6.2 model calls for the use ofrepresentative temperatures. Forthe Chicago area, the representative monthly summertemperatures are the National Weather Service's (NWS) monthly average minimum and maximum temperatures at Chicago's O'Hare Airport in 2008.

2008 Maximum and Minimum Temperatures for Chicago, from O'Hare NWS Data Parameter Jan Feb Mar Apr May Jun 

### Jul Aug Sep Oct Nov Dec Max, 

### oF 

### 32 30 43 60 66 81 84 82 75 62 46 32 Min, 

### oF 

### 15 16 27 39 45 61 64 64 57 44 32 14 2008 Absolute Humidity Corresponding to the Temperatures Above AH, grains/lb 

### 17 14 21 34 41 73 83 74 71 39 25 15

For forecast emissions for later years than 2008, the appropriate temperatures inputs are the climatological averages. The climatological data are based on observed temperature andhumidity observations inthe period 1970-2000, as published bythe NWS and are as follows:

33Climatological Average Maximum and Minimum Temperatures for Chicago Parameter Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Max, 

### oF 

### 30 35 46 58 70 79 84 81 74 62 47 34 Min, 

### OF 

### 14 19 29 38 48 57 63 62 54 42 32 20 Climatological Absolute Humidities Corresponding to the Temperatures Above AH, grains/lb 

### 21 22 25 45 48 92 98 101 75 43 28 21
Absolute Humidity: U.S. EPA guidance calls for the use ofthe lowest absolute humidity (AH) conespondingto the actual (or climatological) temperatures in the region as calculated from local actual (or climatological) humiditydata published bythe NWS. The AHs correspondingto the actual 2008 and climatological monthly temperatures are shown inthe tables above. AHs are calculated from NWS temperature, humidity, and pressure datausing a U.S.EPA-suppliedutility. MOBILE6 requires that AH inputs be 20 or greater, so the AH inputs for the months ofJanuary, February, and December 2008 were setto 20 rather than the actual AHs of 17, 14, and 15. MotorVehicle Emission Controls: The primarymotorvehicle emission control programs that were in place in the Chicago NAA in 2008 are (1) an OBD-II-based vehicle inspection and maintenance (I/M) program, and (2) the requirement that gasoline soldinthe area be "reformulated gasoline", fuel that is specially formulated to reduce emiSSIOnS. Inspection and Maintenance (I/M): The I/M program in effect since February 2007 requires biennial On-Board Diagnostics (OBD) testing on all model year (MY) 1996 and newer (MY96+) light-duty gasoline vehicles, and biennial exhaust idle and gas cap testing onMY96+ heavy-duty gasoline vehicles including gasoline-powered buses, registered in the I/M testing area. The program includes a 4-year grace period for new vehicles such that aMY 2004 car would not be tested unti\2008. The 2007 IIM

### program, established after the Illinois legislature amended the Illinois Vehicle Inspection law in2005, also removed the requirement to conduct dynamometer testing (IM240 test) ofvehicles and dropped the requirement for testing compliant pre-MY1996 vehicles. See Attachment A for additional information about the post- '07 I/Mprogram and the inputs to the MOBILE6 model. (In 2008, but not in later years, there were still residual benefits from the pre-2007 I/M program; they were accounted for in the emission calculations. The Chicago vehicle testing domain is based upon urbanized areas and includes all of Cook, DuPage, and Lake Counties, and parts ofKane, McHemy, Will, and Kendall Counties. Some ofthe VMT inthe Chicago area is generated byvehicles that come from outsidethe testable area and are therefore not required to undergo 

### I1M testing; therefore VMT estimates used when calculating I/M emissions reduction benefits for a county ortownship are adjusted to reflect VMT from vehicles subject to IIM 

### only.

34This is done using I/M coverage factors derived ultimately from transportation modeling outputs from CMAP. The coverage factors are 98% for Cook aud DuPage Counties (that is, 98% ofthe gasoline-vehicle VMT inthe countyis from vehicles subject to IIM), 95% for Lake County, 81% for Kendall County'sNAA township, 65% for Will County, 60% for Kane County, 50% for McHenry County, and 25% for Grundy County's NAA townships. Fuels: Reformulated gasoline (RFG) has been required in the Chicago NAA since 1995. The attainment demonstration and RFP plan both assume all gasoline sold in the Chicago NAA since 1995 is "Northern" grade RFG. Gasoline Sulfur: Gasoline sulfurlevels were assumed to be 30 parts permillion (ppm) in 2008 and in future years in accordance with the federal Tier 2 gasoline regulations which required the 30 ppm level heginning in 2006. An input for gasoline sulfuris not required, since the MOBILE6.2 model assumes 30 ppm gasoline sulfur for RFG after 2006. Diesel Sulfur: Diesel sulfurlevels were assumed to be 15 parts permillion in2008 in accordance with the U.S. EPA's HighwayDiesel Rule whichwas finalized inJanuary 2001. Thisregulation required the sale ofon-road diesel fuel with no greaterthan 15 ppm ofsulfurbeginning inJune 2006. Diesel fuel sulfur concentrations are a required input to the MOBILE6.2 modelwhenparticulate emission factors arc to be evaluated. FuelVolatility: Fuel volatility is a required input to the MOBILE6.2 model, although this input is ignored whenthe use ofRFGis being modeled. FuelRVP varies from monthto month during the year. The following table shows the monthly fuel RVP inputs for the Chicago area in 2008 as well as the expected values for fl!ture years. Monthly Fuel Volatility (Reid Vapor Pressure or RVP) of Reformulated Gasoline (RFG}

in the Chicago Area by Month Parameter Jan 

### I Feb Mar 

### I Apr May 

### I Jun I Jul 

### I Aug 

### I Sep Oct 

### I Nov Dec Actual RVP, psi 

### 13.4 10.9 7.2 

### 10.9 13.1 Expected RVP for 

### 14.0 10.9 6.7 

### 10.9 14.0 future years The 2008 monthlyRVP inputs are from actual measured winter and summerRVP data for northern Illinois as reported inMotor Gasolines Summer 2008 (NGMS-258 PPS (2009/1) (the "NIPER" reports). Future year expectedmonthly RVPs were taken from U.S.EPA's National Emissions Inventory inputs.

35Speeds: The MOBILE6.2 model contains a default speed distribution file (SVMT.D); however, the Illinois EPA assumed area-specific vehicle speed distributions. This distributionbelow is based on 2007 CMAP transportation model output, deemed representative for 2008. VMT Fraction by Road Type by Hour by Speed

1 1 0.0001 0.0000 .0050 0.0075 0.0043 0.0103 .0253 0.0254 .0452 0.0638 0.1040 .3767 0.1943

0.1383 1 2 0.0001 0.0080 0.0148 0.0466 0.0625 .0859 0.0908 .1456 0.1013 0.1130 0.1416 0.1285 0.0299

0.0316 1 3 0.0001 0.0080 .0148 0.0466 0.0625 0.0859 .0908 0.1456 0.1013 0.1130 0.1416 0.1285 0.0299

0.0316 4 0.0001 0.0048 0.0307 0.0799 .0662 0.0918 0.1283 -1232 0.0962 .1322 0.1209 0.0715 0.0286 0.0256 5 0.0000 0.0002 0.0012 0.0103 0.0282 0.0531 .0824 0.0971 0.1819 0.1460 0.1768 0.1341 0.0358 0.0529 1 6 0.0000 0.0002 0.0012 0.0103 0.0282 0.0531 0.0824 0.0971 0.1819 0.1460 0.1768 0.1341 .0358

0.0529 1 7 0.0000 0.0002 0.0012 0.0103 0.0282 0.0531 0.0821 .0971 0.1819 0.1460 0.1768 0.1341 0.0358

0.0529 8 0.0000 0.0002 0.0012 0.0103 0.0282 0.0531 0.0824 0.0971 .1819 0.1460 0.1768 0.1341 .0358 0.0529 1 9 0.0000 0.0002 .0044 0.0256 0.0476 .0554 0.0941 .1110 0.1631 .1493 0.1555 0.1277 0.0264

0.0395 1 10 0.0000 0.0002 0.0044 0.0256 0.0476 0.0554 .0941 0.1110 0.1631 0.1493 0.1555 .1277 .0264

0.0395 1 11 0.0000 0.0083 .0147 0.0337 0.0587 .0474 0.0728 0.1249 O.ll22 .1205 0.1318 0.1771 0.0449

0.0530 1 12 0.0000 0.0083 O.OH7 0.0337 0.0587 0.0474 .0728 0.1219 .ll22 0.1205 0.1318 0.1771 0.0449

0.0530 13 0.0000 0.0001 0.0044 0.0012 0.0133 .0118 0.0238 0.0312 0.0561 0.0519 0.1358 .3491 0.1903 0.1310 1 14 0.0000 0.0001 0.0044 0.0012 0.0133 0.0118 0.0238 0.0312 .0561 0.0519 0.1358 0.3491 0.1903

0 .l.HO 1 15 0.0000 0.0000 .0000 0.0000 0.0000 0.0000 0.0023 0.0201 0.0151 .0416 0.0454 .0992 0.6347 0.1414 1 16 0.0000 0.0000 .0000 0.0000 0.0000 0.0000 0.0023 0.0201 0.0151 0.0416 0.0451 .0992 0.6347

0.1414 1 17 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0023 0.0201 .0151 0.0416 0.0454 .0992 0.6347

0.1414 1 18 0.0000 0.0000 .0000 0.0000 0.0000 .0000 0.0023 0.0201 .0151 0.0416 0.0454 .0992 0.6347

0.1414 1 19 0.0000 0.0000 0.0000 0.0000 .0000 0.0000 0.0023 0.0201 .0151 0.0416 0.0454 0.0992 0.6347 0.1414 1 20 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0023 .0201 .0151 0.0416 0.0454 .0992 0.6347

0.1414 1 21 0.0000 0.0000 0.0000 0.0000 .0000 0.0000 .0023 0.0201 0.0151 .0416 0.0454 0.0992 0.6347

0.1414 1 22 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0023 -0201 0.0151 0.0416 0.0451 0.0992 .6347

0.1414 1 23 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0023 0.0201 0.0151 0.0416 0.0454 0.0992 0.6347

0.1414 1 24 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0023 0.0201 0.0151 0.0416 0.0454 .0992 0.6347 0.1414 2 1 0.0000 0.0008 0.0034 0.0102 0.0177 0.0367 0.1027 0.1775 0.1839 0.2465 0.0867 0.1338 0.0000 0.0000 2 2 0.0017 0.0254 .0689 0.0968 0.1127 0.1207 0.1452 0.1356 .1088 .0924 0.0445 .0474 0.0000 0.0000 2 3 0.0017 0.0254 0.0689 0.0968 0.1127 0.1207 0.1452 0.1356 .1088 0.0924 0.0445 .0474 0.0000 0.0000 2 4 0.0050 0.0531 0.1042 0.1302 0.1335 .1256 0.1265 0.1096 .0819 .0645 0.0314 .0345 0.0000 0.0000 2 5 0.0003 0.0070 0.0329 0.0740 .1233 0.1356 0.1577 -1579 0.1184 0.0963 0.0417 .0547 0.0000 0. 0000 2 6 0.0003 0.0070 0.0329 0.0740 0.1233 0.1356 0.1577 0.1579 0.1184 .0963 0.0417 .0547 0.0000 0.0000 2 7 0.0003 0.0070 .0329 0.0740 .1233 0.1356 0.1577 .1579 0.1184 0.0963 0.0417 .0547 0.0000

0. 0000 2 8 0.0003 0.0070 0.0329 0.0740 0.1233 0.1356 0.1577 0.1579 .1184 .0963 0.0417 .0547 0.0000 0.0000 2 9 0.0008 0.0120 0.0470 0.0938 0.1316 0.1388 0.1523 .1449 0.1091 0.0837 0.0382 .0476 0.0000 0.0000 2 10 0.0008 0.0120 0.0470 0.0938 0.1316 0.1388 0.1523 .1449 .1091 0.0837 .0382 .0476 0.0000 0.0000 2 11 0.0032 0.0375 0.0866 0.1239 0.1277 0.1268 0.1365 0.1206 0.0909 0.0680 0.0356 0.0428 0.0000 0.0000

362 12 0.0032 0.0375 0.0866 0.1239 0 .1277 0.1268 0 .l365 0 .1206 0.0909 0 .0680 0 .0356 0 .0428 0 .0000 0.0000 2 l.J 0.0000 0. 0015 0.0097 0

. 02 8 6 0

. 0596 0.0997 0 .1556 0 .1827 0. J. 63 9 0 .1548 0. 0635 0 .0805 0

. 0000

0.0000 2 14 0.0000 0 .0015 0.0097 0 .0286 0

. 0596 0.0997 0.1556 0 .1827 0.1639 0 .1548 0

. 063 5 0 -0805 0

. 0000 0.0000 2 15 0.0000 0 .0000 0.0000 0 .0000 0

. 00 00 0.0003 0.0615 0.1295 0 .1536 0 .3574 0 .0745 0.2231 0.0000 0.0000 2 16 0.0000 0 .0000 o.oooo 0 .0000 0 .0000 0.0003 0.0615 0.1295 0 .1536 0

. 3574 0 .0745 0

. 2231 0 .0000

0.0000 2 17 0.0000 0.0000 0.0000 0.0000 0 .0000 0.0003 0

. 0 615 0 .1295 0.1536 0

. 3574 0

. 0745 0 .2231 0

. 0000 0.1}000 2 18 0.0000 0
. 0000 0.0000 0 .0000 0.0000 0.0003 0.0615 0.1295 0 .1536 0

. 3574 0 .0745 0.2231 0 .0000

0.0000 2 19 0.0000 0 .0000 0.0000 0

. 00 00 0.0000 0.0003 0

. 0615 0 .1295 0 1536 0 .3574 0

. 0745 0

. 22 31 0

. 0000 0.0000 2 20 0.0000 0 0000 0.0000 0 0000 0 .0000 0.0003 0.0615 0 .1295 0 .153 6 0

. 3574 0 .0745 0.2231 0

. 0 00 0 0.0000 2 21 0.0000 0 .0000 0.0000 0.0000 0 .0000 0.0003 0.0615 0

. 1295 0 .1536 0 .3571 0 .0745 0

. 2231 0
. 0000 0.0000 2 22 0.0000 0.0000 o.oooo 0 .0000 0

. 0000 0.0003 0.0615 0 .1295 0 .1.536 0

. 3574 0. 0745 0.2231 0 .0000 0.0000 2 23 0.0000 0.0000 0.0000 0

. 000 0 0

. 00 00 0.0003 0.0615 0.1295 0 .15.% 0

. 3574 0 .0745 0

. 22 31 0

. 0 00 0 0.0000 2 24 0.0000 0 .0000 0.0000 0 0000 0

. 0000 0.0003 0. 0 615 0 .1295 0 .153 6 0 .3574 0 .0745 0.2231 0 .0000

0.0000

Fraction of vehicle miles traveled within an hour within an average speed bins by hour of the day.

The first hour is 6 a.m. Speed Bins: Hr 2.5 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0 65.0+ Speed bins extend 2. 5 mph on either side of the bin name (i.e. , the 30-mph speed bin encompasses speeds from 27 5 to 32.5 mph), except for the first ·(2.5 mph) bin (0 to 2.5 mph) and the last (65+ mph) bin (62.5 mph and above)

. The abovG. data are for the Chicago NAA and for Freeways and Arterials only. Locals and Ramps have a fixed speed i.n built into the M6 model, and therefore are not affected by this file. The first number in each line is roadway type: 1 =Freeways; 2 "'Arterials. The second number i.s the hour of the day, hour 1 being hour beginning at 6 AM, and hour 24 being hour beginning at 5 AM tlle next day. The third and subsequent numbers are the fractions of VMT in that hour that occurs within the specified speed bins. Note that, for Freeways, most VMT is in the 45-50-55-60-mph speed bins, with lower speeds more common during Peak hours. Much the same holds foJ: Arterials, where most VMT is in the 30-35-40-45 mph speed bins. VMT Mix: Theregional VMT mix inputs used for 2008 werebased on Chicago-areaspecific VMT-by-vehicle-type data suppliedby CMAP from transportation model output whichwere adaptedto represent fractions ofthe vehicle types inMOBILE's descriptive output for differentroadtypes. The VMT Mix used inAnnual emission calculations is an aggregated mix for all road types. This information is used in theMOBILE model to compute the average emission factors for certain combined vehicle classes, and the allvehicle emissionrate. Registration Distribution (RD): A Chicago-area-specific vehicleregistration distribution profile based upon 2008 information data developed by Illinois EPA's Division ofMobile Source Programs from dataprovidedbythe Illinois Secretaryof State's Department ofMotorVehicles. The file was generated using U.S.EPA's recommendedmethod from its MOBILE6.2 training material. Emissions Computation: Illinois EPA calculated annual motorvehicle emissions budgets using thebasic formula: Emissions ofa givenpollutant = VMT

## * Emission Factor (EF) for thatpollutant. The VMT inthat formula is further broken down into VMT by vehicle type, wbich, for a specific vehicle type, equals Total VMT 

## * VMT Mix

37for that vehicle type, such that Emissions ofa givenpollutant for a specific vehicletype= Total VMT 

## * VMT Mix for that vehicle type 

## * EF for that pollutant and vehicle type. For each county or county subdivision in the Chicago NAA, emissions for eachpollutant are calculated bymonth and vehicle type, and summedto give emissions bymonth for all vehicle types. Those monthlytotals are further summed to give annual emissions by county for eachpollutant. In those counties or sub-county areas where there is IIM, 

### IIM benefits were calculated usingthe same formula except that EF was replacedby "I/M Benefit EF" (IMBEF), where IMBEF = EF assuming no I/M- EF assuming I/M program), and the

### IIM coverage factor was included. For I/M counties, No-IIM Emissions were calculated, thenIIM Benefits; and NetEmissions were simplyNo-IM Emissions minus 

### IIM Benefits

.. Attachment A ofthis sectionprovides additional details onthe MOBILE6 model inputs used in the development ofthe 2008 and 2025 Chicago NAA motor vehicle emissions budgets. Following is a discussion ofhow the data for the spreadsheet are generated and used: Annual VMT by county and by month. 1. Aggregate each cotrnty's average daily (ADVMT) byHighwayPerfonnance Monitoring System (HPMS) functional class (FC) into ADVMT bythe four road types (Rural Interstate, Rural Other Functional Classes, Urban Interstate, and Urban Other Functional Classes).
2. Estimate monthlycountyVMT for Januarybymultiplying the ADVMT for each offour roadtypes by the nrnnber ofdays in the month (31) and the appropriate month-long cotrnt division factors (e.g., 0.8572 for Rural Interstates in the Chicago area) from Tablebelow (i.e., bytheMonthlyFactors inthe columns on the right side ofthat Table-25.57 for January Chicago Rural Interstates), and summing the resulting MonthlyVMTs byroad type to get total MonthlyVMT for that month and that county. 3. Do the same for each ofthe other months, and sum the 12 monthlyresults to get total annual VMT for the county. As a check, multiplythe actual or forecast ADVMT by 365 and compare to thetotal from Step 2. The two Annual estimates shouldbe very close-usuallywithin 0.05%. The difference is due to rounding. 

## Factors for Estimating MonthlyVMT from ADVMT Based on lOOT 2002-2005 Count Data and representative of 2005 and future years (Source: IDOT Office ofPlanning & Programming, Sept 2006) Normalized Month-long Count MonthlyVMT Factors (MVFs) Division Factors (MCDFs) = MCDF x days in month

Rural Urban 

### Days Rural Urban Inter- Other Inter- Other 

### in Inter- Other Inter- Other Month states FCs states FCs Month states FCs states FCs 

### CHICAGO AREA (IDOT District 

### l) January 0.8572 0.9643 0.9192 0.9267 31 26.57 29.89 28.50 28.73

38February 0.8789 0.8560 0.9291 0.9379 28 24.61 23.97 26.01 26.26 March 0.9585 0.9461 0.9519 0.9736 31 29.71 29.33 29.51 30.18 April 0.9861 1.0107 0.9981 1.0177 30 29.58 30.32 29.94 30.53 May 1.0323 1.0114 1.0047 1.0280 31 32.00 31.35 31.15 31.87 June 1.1064 1.0688 1.0395 1.0417 30 33.19 32.06 31.19 31.25 July 1.1177 1.0619 1.0538 1.0114 31 34.65 32.92 32.67 31.35 August 1.1050 1.0509 1.0669 1.0183 31 34.26 32.58 33.07 31.57
-· September 1.0210 1.0192 1.0396 1.0143 30 30.63 30.58 31.19 30.43 October 0.9931 1.0124 1.0203 0.9923 31 30.79 31.38 31.63 30.76 November 0.9844 0.9899 1.0207 1.0195 30 29.53 29.70 30.62 30.59 December 0.9594 1.0084 0.9562 1.0186 31 29.74 31.26 29.64 31.58 Jun-Jui-Aug Sum 3.3291 3.1816 3.1602 3.0714 92 102.10 97.56 96.93 94.17
Emission factors by vehicle type representative ofeach month were obtainedby running the MOBILE6.2 model twelve times, once for each monthusing average monthlytemperature and fuel inputs as noted above. All twelve monthlyruns for an area canbe on a single input file. All-Facility-Type EFs were calculated assuming the default distribution ofVMT among facility types; this is a reasonablebecause the Statewide M6 FacilityType fractions (Freeway 31%, Arterial 58%, Local 8%, Ramp 3%) are reasonably close to MOBILE6's default fractions (Freeway 34%; Arterial 50%, Locall3%, Ramp 3%). For fi.tture-year estimates, one woulduse monthly climatological temperature and absolute humidity averages available from the National Weather Service's National Climatic Data Center (NCDC) in the form ofLocal Climatological Datapublications, as described above. Most ofthe otherMOBILE inputs are "fixed", that is, they don't change from month to month. Examples are: Activity Inputs such as VMT byHour, VMT by SpeedBin, and VMTbyFacilityType, and VMTFractions. Onewould l)se the same ones here as in the SummerWeekdayEF calculations. The MOBILE monthly inputs for Year and Month ofOutput EFs in a given year shouldbe for evaluation months ofJanuary [Year], July [Year], or January [Year+ 1]. See the table below for 2008. U.S.EPA's MOBILE6.2 Technical Guidance Document (August 2004), recommends that the resulting emission factor outputs be used as is (i.e., without interpolation) for the monthly EFs. 

### Year and MonthInput Settings for MOBILE6.2 for Monthly 2008 Emission Factors MOBILE InputValues for Months for Which Evaluation Month M6.2 EFs Are Desired & CalendarYear January, February, orMarch 2008 1 (January) and 2008

April through September 2008 7 (July) and 2008

39[9ctober, November, orDecember2008 1 (January) and 2009 Emission factor results from the MOBILE runs are extracted from the MOBILE output files (*OUT or *,TXT for VOC, CO, and NOx; *,PM for S02, ammonia, and the particulate species) and placed in a page ofan Excel spreadsheet. The "pivot table" commands in Excel allow the userto take those emission factors andput them into the tabular form used iuthe emission calculation spreadsheet, to which they are copied. At thispoint, the emission calculation spreadsheet has VMT by county and month on one page, and emission factors by vehicle type and month (and I/M status) on another. A third page contains All-Facility-Type Vehicle Mix bymonth and vehicle type. The same mix is used for all months. Subsequentpages contain the results ofemission calculations by c01mty, which arc evaluated as follows. 

### 1. No-liM County Emissionsbyvehicle type (VT) and month= (COlmty ADVMT by month* (VMT Mix byVT and month) 

## * No-I/M EFbypollutant, VT, and month)* 1.102 x 10·6 (grams-to-ton conversion factor). For areas without I/M, this is the only calculation. 2. liM CreditsbyVT and month for counties with liM= CountyVMTbymonth 

## * VMTmix as above 

## * liM Credit EF bymonth (i.e., No-liM EF- liM EF by month, bypollutant andvehicle type) 

## * I/M Coverage factor* 1.102 x 10"6). liM Credits will exist for VOC, CO, and NOx, but not for any S02, NH3, or any PM species. 3. Net Co1mty Emissions byVT and month for counties withliM= (No-I/M Com1ty Emissions byVT and month)- (liM Credits byVT and month). 4. For Gnmdy and Kendall Counties, which are only partlyintheNAA, No-I/M emissions were calculated for the NAAtownships and Attainmenttownships separately using NAA-township VMT data and Attainment Township VMT data; then the liMbenefits for the NAAtownships, then the NetEmissions for the NAA townships as in 3 above, and finally All-County emissions, which are the smn ofthe emissions for the Attainment townships andthe Net Emissions for the NAAtownships Once each county's or county subdivision's emissions for all pollutants have been calculated, the spreadsheet canbe commanded to aggregate them into NAA totals by pollutant.



### MotorVehicle Emissions Budgets Using the above VMT and controlprogram assumptions and methodology, following are 2008 and 2025 the proposed Chicago PM2
.5 Maintenance Planmotorvehicle emissions budgets (rounded to the nearest ton/year) for use in determining transportation conformity.



### 40Proposed 2008 and 2025 Motor VehicleEmissions Budgets Chicago PM2.s Maintenance Plan (tons per year)
Year PMz.s NOx 2008 1,816 99,627 2025 1,064 23,687

External MOBILE6.2 Inputs: Inthe examples ofexternal files shownhelow, the actual command lines are boldfaced; the unbolded lines represent comments. The actual text files have no such distinction in typefaces. The unbolded lineshave been "commented out" and have no effect onthe MOBILE model. Theymaythereforebe omitted, but it is suggestedthat they remainin the files for documentation, andto make the files easier for the user to read and understand.
The comments and othertext in the ExternalFiles havebeen shown in the Courier Newtypeface. Actual command lines-the inputs that MOBILE actually uses-are shown in Courier New Bold


### Vehicle Inspection and Maintenance (l/M) Program
The external IIM files giving the inputs usedby theMOBILE6 model to generate year 2008 emissions factors is describedbelow. The first is thepost-2007 IIM programthat went into effectin early2007. Since it is a biennial program, about 

### Y. ofvehicles subject to IIM hadbeen testedunderthis program bymid 2008; but Y, ofthem hadbeen tested underthe pre-2007 program and were still generatingbenefits from the oldprogram. Thus the actual IIM benefits in 2008 are the weighted average ofthe benefits ofthe two programs, the weighting factors being 75% for the post-'07 program and 25% for the pre- '07 program. Belowis the post-'07 IIM program description, representedbythe external input file IM070N.D. This program is expected to continue into the foreseeable future. It represents an IIM program with four components, chiefofwhich is an OBD (on-board diagnostics) test for vehicles ofmodel year (MY) 1996 and newer. The order inwhich the components appear inthe external file is not significant, but they mustbe numbered consecutively. Illinois EPA begins the external file with identifying comments and adds other comment lines orblank lines to make the file easier to read and understand.

* ILLINOIS**ENRhl~CED** I/M DESCRIPTION

41* Filename: IM070N.D * External input file for Illinois 1 OBD-only I/M program * from 2007 on. * OBD-only applies to light-duty vehicles only; HDVs still get * an Idle Test & Gas Cap Check. * All program start years set to 1986 per U.S. EPA guidance in * 11 Frequently Asked Questions on MOBILE6 11 from U.S. EPA/OTAQ. * This represents the NEW I/M program in which only 1996 & newer vehicles are tested with an OBD test; and the OBD test applies only to LDVs. * *

. 

### , This program came into effect in February 2007

.
*------------------------------------------------- * Program description for post MY 1 96 LDV OBD I/M***=~~=====~=========~==============================** * FIRST I/M program-- 11 Evaporative] 11 OED for MY 1996+ LDVs *------------------------------------------------- I/M PROGRAM 1 1986 2050 2 T/0 EVAP OBD I/M MODEL YEARS 1 1996 2050 I/M VEHICLES 1 22222 11111111 1 I/M STRINGENCY 1 20.0 I/M COMPLIANCE 1 95.0 I/M WAIVER RATES 1 0.5 2.2 '01 data I/M EXEMPTION AGE 1 25 I/M GRACE PERIOD 1 4 In each case, the first number after the colonrefers to the liMprogram's component number. I/M PROGRAM : 1 1986 2050 2 T/0 EVAP OBD

Testingbegan in 1986 and mns into the indefinite future (2050). The program is abiennial test-only (2 T/0, here and in otherprogram components) program, in this case an Evaporative OED test. The vehicle engine computerrecords information from sensors in the engine and fuel system. Indications of malfunctions or out-of-specification operations ofthe engine or fuel and evaporative emission control systems are stored inthe engine computer as "fault codes". An OED test consists ofplugging a special scanner into an outputjack from vehicle's engine computer. The scanner queries the computer and records any fault codes that the computer's OED system has saved. OBD tests are quick, dependable, and clean, and, ifa vehicle fails an OBD test, the fault codes that the scanner displays help mechanics diagnose the problem. I/M MODEL YEARS : 1 1996 2050

This program component covers only vehicles manufactured between model year (MY) 1996 (start year) and the indefinite future (MY 2050, the end year). Anincreasingpercentage ofvehicles are becoming subject to this test as new vehicles are purchased and older (pre-MY-1996) vehicles areretired. I/M VEHICLES : 1 22222 11111111 1



### 42Onlythe five light-duty vehicle types only light-duty gasoline vehicles (LDGVs) and light-duty gasoline tmcks (LDGTs l, 2, 3, and 4) are coveredbythis program component (22222). Heavy-duty gasoline tmcks (eight types) and gasoline buses are not covered bythis program component (11111111 1), but ratherbyPrograms 3 and 4, described below. I/M STRINGENCY : 1 20.0

Stringency (exhaust inspection failure rate) is 20%. A Stringency entry is necessary for an exhaust test, but not an evaporative test, so this entry can be omitted or "commented out". Inthis Evap test case, it will be ignoredbythe model, but is included for reference. I/M COMPLIANCE : 1 95.0

Compliance rate (tested vehicles as percent ofall vehicles subject to I/M) is 95% I/M WAIVER RATES : 1 0.5 2.2 '01 data

The Waiver Rate is the fraction oftested vehicles that get a waiver-i.e., do not pass the IIM test but, because repairs costmore than a specified amount, get a certificate ofcompliance. Waiverrate is 0.5% for MY 1980 and earlier vehicles (irrelevant now that pre-MY-96 vehicles are not tested), and 2.2% for MY 1981 and later vehicles. These figures are from VlM's actual2001 waiver statistics, and have beenrepresentative ofthe last few years, so arc deemed representative of2009. lnthis case the comment stating that fact is allowed in the same line as the data. I/M EXEMPTION AGE : 1 25

Vehicles olderthan 25 years are not subject to this program. This will not happen until at least 2021. The default is 25, and the model does not calculate benefits for vehicles older than 25 years, so in essence this commandhas no effect. It couldbe omitted, but is included for completeness. I/M GRACE PERIOD : 1 4

Vehicles less than 4 model years old-inthis case MY2006, '07, '08, and '09- are exempt from I/M testing. Most ofthe inputs to the second and subsequentprogram components are the same as those for the first program, so the description ofthe components will be abbreviated and summarized as below, rather than after each command line as above. 

### * Second I/M program--"Exhaust" OBD for MY 1996+ LDVs *---------------------------------------------------- I/M PROGRAM I/M MODEL YEARS I/M VEHICLES I/M STRINGENCY 2 1986 2050 2 T/0 OBD I/M 2 1996 2050 2 22222 11111111 1 2 20.0

43I/M COMPLIANCE 2 95.0 I/M WAIVER RATES 2 0.5 2 . 2 '01 data I/M EXEMPTION AGE 2 25 I/M GRACE PERIOD 2 4 

### *The second program component is abiennial, test-onlyExhaust OBD test for

MY 1996 and later LDGVs and LDGTs. In this OBD test, the scanner queries the vehicle's computer for fault codes concerning exhaust emissions. Stringency, Compliance, Waiver Rates, Exemption Age, and Grace Period are the same as inthe first program. An entry for I/M STRINGENCY (20%) is required for an Exhaust IIM program.
*------------------------------------------------------- 

### * Program description for post MY'96 HDV Idle & GC I/M***============================================~=========** 

### * Third I/M program--HDV IDLE for MY 1996+ HDVs *------------------------------------------------ I/M PROGRAM 3 1986 2050 2 T/0 IDLE I/M MODEL YEARS 3 1996 2050 I/M VEHICLES 3 11111 22222222 2 I/M STRINGENCY 3 20.0 I/M COMPLIANCE 3 95.0 I/M WAIVER RATES 3 1.2 1.5 '01 data I/M EXEMPTION AGE 3 25 I/M GRACE PERIOD 3 4



### The third program component is abiennial, test-onlyIdle test for MY 1996 and laterHDGVs and Gas Buses (22222222 2). Light-duty vehicles are not subject to this component (11111), but rather to components 1 and 2. Stringency, Compliance, Exemption Age, and Grace Period are the same as in component 1, but the pre- andpost-MY 1981 Waiver Rates (1.2% and 1.5%, respectively), are slightly different from those in components 1 and 2. HDGVs are few in number, and most ofthem are commercial vehicles. 

## * Fourth I/M program--Gas Cap Check for MY 1996+ HDVs *---------------------------------------------------- I/M PROGRAM 4 1986 2050 2 T/0 GC I/M MODEL YEARS 4 1996 2050 I/M VEHICLES 4 11111 22222222 2 I/M COMPLIANCE 4 95.0 I/M WAIVER RATES 4 1.2 1.5 '01 data I/M EXEMPTION AGE 4 25 I/M GRACE PERIOD 4 4



### The fourth program component is abiennial, test-only Gas Cap Check for MY 1996 and laterHDVs. Compliance, Waiver Rates, Exemption Age, and Grace Period are the same as in the third program. Since a Gas Cap Check is an



### 44evaporative IIM test, the IIM STRINGENCY command is not necessary and is not included here. Below is the pre-'07 IIM program ILLOBDIM.D * ILLINOIS ENHANCED I/M DESCRIPTION Filenameo ILLOBDIM.D 

### * OED EXH AND GAS CAP 1996+ BEGINNING IN 2002 * The Illinois I/M is Biennial Test Only (2 T/0) program * that applies to LDGVs, LDGTs, and, in slightly different * fashion, to HDGVs. Exhaust & Evaporative OBD is for * MY 1 96+ vehicles; IM240 and simple Idle tests remain for * pre- 1 96 LDVs pre- 1 81 LDVs respectively. * R.ef to MYCUTS in 2nd program changed to Fo\ONROAD\AREASPEC\MYCUTS.D * by SL on 31.j.05 from Fo\ONROAD\MOBILE62\RUN\EXAMPLES\MYCUTS.D
*
------------------------------------------------- 

### * Program Description for older LDVs' I/M programs *
--------------------------------------------- * First I/M program- ·-IDLE test for MY 1968+ LDVs I/M PROGRAM 1 1986 2050 2 T/0 IDLE I/M MODEL YEARS 1 1968 1980 I/M VEHICLES 1 22222 11111111 1 I/M STRINGENCY 1 20.0 I/M COMPLIANCE 1 95.0 I/M WAIVER RATES 1 0.5 2.2 '01 data I/M GRACE PERIOD 1 4 * Program 1is for vehicle ofMY1968 to MY 1980. It consists ofabiem1ial testonly Idle Test for light-duty cars aud trucks (22222), with stringency of20%, Compliance of90%, and a4-year graceperiod (which is irrelevant, since 1980 is long in the past. Waiver rates are 0.5% and 2.2% for pre-MY1981 and MY1981- and-after The 1M240 cutpoints are givenbythe MYCUTS.D file. See the MOBILE6 User's Guide, Section 2.8.9.4.g

.. * Second I/M program--IM240 for MY 1981 to 1995 LDVs I/M PROGRAM 2 1999 2050 2 T/0 IM240 I/M MODEL YEARS 2 1981 1995 1/M VEHICLES 2 22222 11111111 1 I/M STRINGENCY 2 20.0 I/M CUTPOINTS 2 Fo\ONROAD\AREASPEC\MYCUTS.D I/M COMPLIANCE 2 95.0 I/M WAIVER RATES 2 0.5 2.2 '01 data I/M GRACE PERIOD 2 4 * * Third I/M program Gas Cap Check for MY 1968 to 1995 LDVs I/M PROGRAM 3 1992 2050 2 T/0 GC I/M MODEL YEARS 3 1968 1995 I/M VEHICLES 3 22222 11111111 1 * I/M STRINGENCY not required in evaporative I/M program input

45I/M COMPLIANCE I/M WAIVER RATES I/M GRACE PERIOD 3 95. 0 3 0.5 2.2 3 4 1 01 data

The second and third 

### VM programs also apply to light-cars and trucks and consists ofa biennial IM240 test and a Gas Cap Check for vehicles ofMYl98l through MY 1995. Stringency, Compliance, WaiverRates, and Grace Period are as above, The fourth and fifth liM programs apply to light-duty vehicles (22222) of MY1996 on. Program 4 is a biennial Test-OnlyEvaporative OBD Test+ Gas Cap Check; and Program 5 is 

### abiennial Test-Only "Exhaust" OBD test, as described below. There is a 4-year grace period; thus in 2008 the OBD tests have been applied onlyto light-duty vehicles from MY1996 to MY2004, *
-------------------------------------------------------- * Program description for LDV Evaporative and Exhaust OED *
-------------------------------------------------------- * Fourth I/M program--EVAP OBD & Gas Cap Check for 1996+ LDV I/M PROGRAM 4 2002 2050 2 T/0 EVAP OBD & GC I/M MODEL YEARS 4 1996 2050 I/M VEHICLES 4 22222 11111111 1 * I/M STRINGENCY not required in evaporative I/M program input I/M COMPLIANCE 4 95.0 I/M WAIVER RATES , 4 0.5 2.2 '01 data I/M GRACE PERIOD 4 4 * Fifth I/M program-- 11Exhaust 11 OBD for MY 1996+ LDVs I/M PROGRAM 5 2002 2050 2 T/0 OBD I/M I/M MODEL YEARS 5 1996 2050 I/M VEHICLES 5 22222 11111111 1 I/M STRINGENCY 5 20.0 I/M COMPLIANCE 5 95.0 I/M WAIVER RATES 5 0.5 2.2 '01 data I/M GRACE PERIOD 5 4 The final two programs in the ILLOBDIM file applyto heavy-duty vehicles (HDVs) only (22222222 2), and consist ofan Idle Test and a Gas Cap check for all HDVs ofMY1968 and later, with a 4-year graceperiod *
----------------------------------------------- * Program description for Heavy-Duty Vehicle I/M *
----------------------------------------------- * Sixth I/M program--HDV IDLE for MY 1968+ HDVs I/M PROGRAM 6 1986 2050 2 T/0 IDLE I/M MODEL YEARS 6 1968 2050 I/M VEHICLES 6 11111 22222222 2 I/M STRINGENCY 6 20.0 I/M COMPLIANCE 6 95.0 I/M WAIVER RATES 6 1.2 1.5 '01 data I/M GRACE PERIOD 6 4

46* * Seventh I/M program--Gas Cap Check for MY 1968+ HDVs I/M PROGRAM 7 1992 2050 2 T/0 GC I/M MODEL YEARS 7 1968 2050 I/M VEHICLES 7 11111 22222222 2 * I/M STRINGENCY not required in evaporative I/M program input I/M COMPLIANCE 7 95.0 I/M WAIVER RATES 7 1.2 1. 5 '01 data I/M GRACE PERIOD 7 4 * *
---------------- * * NOTES: * This is the standard Illinois I/M input, describing * the I/M program with OBD as it exists after early * March 2002. The MYCUTS file mentioned above is as follows: * This file was created automatically by a Mobile6 conversion utility. * The same cutpoints are used for each model year and vehicle type. I/M CUTPOINTS , CUTP015.D * * * Block 0.800 0. 800 1 (LDGV, LDGT1) 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 * * Block 2 (LDGT2, LDGT3) 0.800 0.800 0.800 15.000 0.800 0.800 0.800 15.000 0.800 0.800 0.800 15.000 0.800 0.800 0.800 15.000 0.800 0.800 0.800 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 0.800 0.800
15.000 15.000 0.800 0.800
15.000 15.000 0.800 0.800
15.000 15.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 * * Block 3 (LDGT4) 0.800 0.800 0.800 0.800 15.000 15.000 0.800 0.800 15.000 15.000 0.800 0.800 0.800 15.000 0.800 0.800 0.800 15.000 0.800 0.800 0.800 15.000 15.000 15.000 15.000 15.000 15.000 15.000 0.800 0.800
15.000 15.000 0.800 0.800
15.000 15.000 0.800 0.800
15.000 15.000 0.800 0.800 15.000 15.000 0.800 0.800 15.000 15.000
999.000 999.000 999.000 999.000

0.800 0.800
15.000 15.000 0.800 0.800
15.000 15.000 15.000 15.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 

### ., * Block 4 (HDGV) 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800



### 47 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.8000.800 0 .800 0.800 0.800 0.800 15.000 15. 000 15.000 15.000 15.000 15. 000 15.000 15.000 15.000 15.000 15.000 15. 000 15.000 15.000 15.000 15. 000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 999.000 999.000 999.000 999.000 999. 000 999 .000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999. 000 999 .000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000 999.000



### The Registration Distribution TheRegistration Distribution (RD) for a vehicle type is an indication ofthe fraction of the vehicle fleet ofthat type that is made up ofvehicles ofa given age. The following is based on 2008 registration data from the Illinois Secretary ofState's office (ISOS). It and its contents are describedbelow. The file is named CHRD08AA.D.
REGISTRATION DISTRIBUTION * CNAA M6 LDV RD = SOSLDV (Light-duty Vehicles--passenger cars) RD from * 08VADbyCounty.xls for Chicago omitting '09 counts & '08 = 75% of '07

1 0.0550 0.0733 0.0675 0.0656 0.0649 0.0666 0.0698 0.0665 0.0680 0.0598 0.0524 0.0500 0.0415 0.0421 0.0325 0.0263 0.0218 0.0166 0.0134 0.0103 0.0074 0.0057 0.0043 0.0033 0.0154 * CNAA M6 LDTl RD = SOSLDTl (ISOS "light" or type 1 LD trucks) RD from * 08VADbyCounty.xls for Chicago omitting '09 counts & '08 = 75% of '07

2 0.0526 0.0702 0.0769 0.0872 0.0796 0.0729 0.0835 0.0670 0.0669 0.0586 0.0583 0.0478 0.0385 0.0342 0.0294 0.0219 0.0148 0.0118 0.0076 0.0065 0.0051 0.0031 0.0020 0.0012 0.0024
* CNAA M6 LDT2 RD = Same as M6 LDT1 RD; see above.

3 0.0526 0.0702 0.0769 0.0872 0.0796 0.0729 0.0835 0.0670 0.0669 0.0586 0.0583 0.0478 0.0385 0.0342 0.0294 0.0219 0. 0148 0. 0118 0.0076 0.0065 0.0051 0.0031 0.0020 0.0012 0.0024 * CNAA M6 LDT3 = SOSLDT21 (ISOS 11 heavy" or type 2 LD trucks) RD from * OBVADbyCounty.xls for Chicago omitting '09 counts & '08 = 75% of •07

4 0.0457 0.0609 0.0635 0.0720 0.0854 0.0843 0.0729 0.0689 0.0705 0.0800 0.0517 0. 0472 0.0349 0.0375 0.0294 0.0203 0. 0162 0.0095 0.0104 0.0099 0.0075 0.0049 0.0041 0.003 0.0094
* CNAA M6 LDT4 = same as LDT3 RDs; see above.

5 0.0457 0.0609 0.0635 0.0720 0.0854 0.0843 0. 0729 0.0689 0.0705 0.0800 0.0517 0.0472 0.0349 0.0375 0.0294 0.0203 0.0162 0.0095 0.0104 0.0099 0.0075 0.0049 0.0041 0.003 0.0094

48* Heavy-Duty & MC RDs below are all assumed same as M6 default RD. * HDV2B (Heavy-duty vehicles 2B--M6 Default RDs)

6 0.0503 0.0916 0.0833 0.0758 0.0690 0.0627 0.0571 0.0519 0.0472 0.0430 0.0391 0.0356 0.0324 0.0294 0.0268 0.0244 0.0222 0.0202 0.0184 0.0167 0.0152 0.0138 0.0126 0.0114 0.0499 * HDV3 (Heavy-duty vehicles3, same RD as HDV2B, M6 Default RDs)

7 0.0503 0.0916 0.0833 0.0758 0.0690 0.0627 0.0571 0.0519 0.0472 0.0430 0.0391 0.0356 0.0324 0.0294 0.0268 0.0244 0.0222 0.0202 0.0184 0.0167 0.0152 0.0138 0.0126 0.0114 0.0499 * HDV4 (Heavy-duty vehicles 4, M6 default RDs)

8 0.0388 0.0726 0.0679 0.0635 0.0594 0.0556 0.0520 0.0486 0.0455 0.0425 0.0398 0.0372 0.0348 0.0326 0.0304 0.0285 0.0266 0.0249 0.0233 0.0218 0.0204 0.0191 0.0178 0.0167 0.0797 * HDVS (Heavy-duty vehicles 5, same RD as HDV4, M6 Default)

9 0.0388 0.0726 0.0679 0.0635 0.0594 0.0556 0.0520 0.0486 0.0455 0.0425 0.0398 0.0372 0.0348 0.0326 0.0304 0.0285 0.0266 0.0249 0.0233 0.0218 0.0204 0.0191 0.0178 0.0167 0.0797 * HDV6 (Heavy-duty vehicles 6, same RD as HDV4, M6 Default) 10 0.0388 0.0726 0.0679 0.0635 0.0594 0.0556 0.0520 0.0486 0.0455 0.0425 0.0398 0.0372 0.0348 0.0326 0.0304 0.0285 0.0266 0.0249 0.0233 0.0218 0.0204 0.0191 0.0178 0.0167 0.0797 * HDV7 (Heavy-duty vehicles 7, same RD as HDV4, M6 Default) 11 0.0388 0.0726 0.0679 0.0635 0.0594 0.0556 0.0520 0.0486 0.0455 0.0425 0.0398 0.0372 0.0348 0.0326 0.0304 0.0285 0.0266 0.0249 0.0233 0.0218 0.0204 0.0191 0.0178 0.0167 0.0797

_,.. HDVSA {Heavy-duty vehicles SA same RD as HDV4, M6 Default) 12 0.0388 0.0726 0.0679 0.0635 0.0594 0.0556 0.0520 0.0486 0.0455 0.0425 0.0398 0.0372 0.0348 0.0326 0.0304 0.0285 0.0266 0.0249 0.0233 0.0218 0.0204 0.0191 0.0178 0.0167 0.0797 * HDVSB (Heavy-duty vehicles SB,same RD as HDV4, M6 Default) 13 0.0388 0.0726 0.0679 0.0635 0.0594 0.0556 0.0520 0.0486 0.0455 0.0425 0.0398 0.0372 0.0348 0.0326 0.0304 0.0285 0.0266 0.0249 0.0233 0.0218 0.0204 0.0191 0.0178 0.0167 0.0797 * HDBS (HDV School buses; this M6 RD default is assumed) 14 0.0393 0.0734 0.0686 0.0641 0.0599 0.0559 0.0522 0.0488 0.0456 0.0426 0.0398 0.0372 0.0347 0.0324 0.0303 0.0283 0.0264 0.0247 0.0231 0.0216 0.0201 0.0188 0.0176 0.0165 0.0781 * HDBT (HDV Transit buses; this M6 RD default is assumed) 15 0.0307 0. 0614 0.0614 0. 0614 0.0614 0.0614 0. 0614 0.0614 0.0614 0. 0613 0.0611 0.0607 0.0595 0.0568 0.0511 0.0406 0.0254 0.0121 0.0099 0.0081 0.0066 0.0054 0.0044 0.0037 0. 0114 * MC (Motorcycles; this M6 default RD is assumed) 16 0.1440 0.1680 0.1350 0.1090 0.0880 0.0700 0.0560 0.0450 0.0360 0.0290 0.0230 0.0970 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 o.oooo 0.0000 0.0000 0.0000 0.0000

This Chicago area-specific data is derived from ISOS registration data for LDVs subject to I/M inthe Chicago-area counties. Since more than 90% ofthe light-duty gasoline vehicles in the Chicago NAA are subjectto I/M, we assume the RD for Chicago-area LDVs subject to IIM is representative ofthat for all Chicago-area LDVs. The ISOS datawere counts for what ISOS calls "LDVs", LDTls", and "LDT2s" by model year (MY). Those appearbelow as SLDV, SLDTl, and SLDT2 to distinguish them from M6 vehicle types. • SLDVs correspond to passenger cars, so SLDVs = M6 LDVs.

49• SLDTls correspond to M6 LDTls and LDT2s. ISOS data do not distinguish between the two M6 categories. For this reason, the RDs for M6 LDTl and LDT2 are assumed to be the same. • Similarly, SLDT2s correspond to M6 LDT3s and LDT4s, and ISOS data don't distinguishbetween those two M6 categories either. Therefore, the RDs for M6 LDT3 and LDT4 are also assumed to be the same. The age distribution fractions have been rounded to 4 decimal places, and where the rounded fractions do not add up to 1.0000 exactly, RD fractions for old (age 22 to 24 years) have at times beenmodified by+/- 0.0001 so as to make the RDs add up to 1.0000, a requirement ofthcMOBILE6.2 model. In this RD file, the first number in each distribution is an integer that indicates which of the 16 M6 vehicle classes are represented bythe RD in question. That number is followed by25 age fractions arranged in two rows of 10 values followed by a third row with the last 5 values. Itis assumed that the RDs for diesel vehicles are the same as the RDs for the corresponding gasoline vehicles; in particular, LDDV and LDDT RDs are assumed the same as LDGV and LDGT RDs. Since the (default) HDV RDs are basedmore on diesel vehicles to start with, and HDGVs are many fewer thanHDDVs, especiallyinthe higher weight classes, we feel the default HDV RDs representbothHDGV and HDDV reasonably well. Default RDs are assumed for the various HDV classes. Good area-specific HDV age distribution data are lacking-theISOS data covered onlylight-duty vehicles subject to liM-andbesides, much Chicago-area HDV VMT is from vehicles registered outside the Chicago area andjustpassingthrough. The best choice, then, was to go with the HDV defaults. Similarly, accurate local-arearegistration data for motorcycles are lacking, so the default MC RD is used.


### External MOBILE6.2 Activity FileInputs: VMT by Facility Type,VMT byHour, VMT by SpeedBin. The following files were used in the 2002 base year and the 2009 future year estimates. VMTby FacilityType The M6.2 default file is FVMT.D, provided with the MOBILE6model. The Chicagoarea-specific VMT-by-facility-type file is FVMTCH07.D, shown below. Itbased on the most recent complete data from CMAP on VMT byhourbyvehicle class. This is a very long file ---about 750 lines-so for the purposes ofthis Attachment, onlythe data for vehicle types 1, 6, 11, 13,24 (LDGV, HDGV2b, HDGV7, HDGV13, and MC) are shown; the others are omitted. See the secondparagraph ofthe introduction to the file.

50VMT BY FACILITY * * * VMT fractions are listed for 28 vehicle classes for each hour of * the day starting at 6AM, as follows * Classes 1-5 (LDGV, LDGTl, LDGT2, LDGT3, and LDGT4}, and * Classes 14, 15, and 28 (LDDV, LDDT12, LDDT34} were all assumed**-~<** to have the 11 Light-duty Vehiclen distribution on page "SL VMT * by vtype reedited 11 of the MF13 file. * Classes 6-10 and 16-20 (HDGV2b-HDGV6 and HDDV2b-HDDV6} were assumed * to have the "LTRK 11 (light HDV} distribution on that page. * Classes 11 & 12 and 21 & 22 (HDGV7 & HDGVSa, and HDDV7 & HDDVSa} were * assumed to have the "MTRK 11 (medium HDV} distribution on that page. * Classes 13 and 23 (HDGVBb and HDDVBb} were assumed to have the * 11 HTRK 11 (heavy HDV) distribution on that page * Classes 24 and 25-27 (Motorcycles and the three bus classes [HDGB,
'!.- HDDBT and HDDBS]} were assumed to have the default distribution * for those types in FVMT.DEF. * * The four values in each line represent the VMT distribution on * freeway, arterial, local and ramps--in that order--as shown. * * See M6UG 2. 8. 5 .1. f., p. 49, or CLASJ.JIST.TXT for further info. * (The CLASLIST file describes the vehicle classes.) * -1< Veh Int& *Class Fwys Arts& Calls Local Rd/St Ramps *----- * 1 0.3341 0.5393 0.1105 0.0161 0.2604 0.6106 0.1160 0.0130 0.2604 0.6106 0.1160 0.0130 0.2669 0.5831 0.1365 0.0135 0.2576 0.5823 0.1468 0.0133 0.2576 0.5823 0.1468 0.0133 0.2576 0.5823 0.1468 0.0133 0.2576 0.5823 0.1468 0.0133 0.2683 0.5830 0.1354 0.0133 0.2683 0.5830 0.1354 0.0133 0.2646 0.5911 0.1315 0.0128 0.2646 0.5911 0.1315 0.0128 0.2825 0.5568 0.1468 0.0139 0.2825 0.5568 0.1468 0.0139 0.3363 0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 0.3363 0.5122 0.1358 0.0157 [Data for Vehicle Types 2 through 5 omitted]
6 0.3836 0.5157 0.0827 0.0180 0.3045 0.5985 0.0822 0.0148 0.3045 0.5985 0.0822 0.0148 0.3589 0.5412 0.0829 0.0170 0.3791 0.5203 0.0826 0.0180

510.3791 0.5203 0.0826 0.0180 0.3791 0.5203 0.0826 0.0180 0.3791 0.5203 0. 0 82 6 0.0180 0.3606 0.5397 0.0827 0.0170 0.3606 0.5397 0. 0827 0.0170 0.3581 0.5432 0.0816 0.0171 0.3581 0.5432 0.0816 0.0171 0.4101 0.4884 0.0815 0.0200 0.4101 0.4884 0.0815 0.0200 0.4312 0.4663 0.0818 0.0207 0.4312 0.4663 0.0818 0.0207 0.4312 0.4663 0.0818 0.0207 0. 4312 0.4663 0.0818 0.0207 0.4312 0.4663 0.0818 0.0207 0. 4312 0.4663 0.0818 0.0207 0.4312 0.4663 0.0818 0.0207 0. 4312 0.4663 0.0818 0.0207 0.4312 0.4663 0.0818 0.0207 0.4312 0.4663 0.0818 0.020'1 [Data for Vehicle Types 7 through 11 omitted]

11 0.4158 0.4904 0.0752 0.0186 0.3337 0.5763 0. 0749 0.0151 0.3337 0.5763 0.0749 0.0151 0.3905 0.5165 0.0755 0.0175 0. 4111 0.4952 0.0752 0.0185 0.4111 0.4952 0.0752 0.0185 0. 4111 0.4952 0.0752 0.0185 0. 4111 0.4952 0.0752 0.0185 0.3928 0. 5144 0.0753 0.0175 0.3928 0. 5144 0.0753 0.0175 0. 3 896 0.5185 0.0742 0.0177 0.3896 0.5185 0.0742 0.0177 0.4423 0.4630 0.0743 0.0204 0.4423 0.4630 0.0743 0.0204 0.4619 0.4425 0.0745 0. 0211 0.4619 0.4425 0.0745 0. 0211 0.4619 0.4425 0.0745 0.0211 0.4619 0.4425 0. 0745 0.0211 0.4619 0.4425 0.0745 0. 0211 0.4619 0.4425 0.0745 0. 0211 0.4619 0.4425 0.0745 0. 0211 0.4619 0.4425 0.0745 0.0211 0.4619 0. 4425 0.0745 0.0211 0.4619 0. 4425 0.0745 0. 0211 [Data for Vehicle Types 7 through 12 omitted]
13 0.6106 0.3299 0.0430 0.0165 0.5563 0.3937 0.0367 0.0133 0.5563 0.3937 0.0367 0.0133 0.6241 0.3235 0.0376 0. 0148 0.6260 0.3178 0.0403 0.0159 0.6260 0.3178 0.0403 0.0159 0.6260 0.3178 0.0403 0.0159 0.6260 0.3178 0.0403 0.0159 0.6561 0.2957 0.0340 0.0142 0.6561 0.2957 0.0340 0.0142 0.6029 0.3414 0.0401 0.0156 0.6029 0. 3414 0.0401 0.0156 0.5776 0.3523 0.0508 0.0193

520.5776 0.3523 0.0508 0.0193 0.5737 0. 3512 0.0547 0.0204 0.5737 0. 3512 0.0547 0. 0204 0.5737 0. 3512 0.0547 0.0204 0.5737 0. 3512 0.0547 0.0204 0.5737 0. 3512 0.0547 0.0204 0.5737 0. 3512 0.0547 0.0204 0.5737 0. 3512 0.0547 0.0204 0.5737 0. 3512 0.0547 0.0204 0.5737 0.3512 0.0547 0.0204 0.5737 0.3512 0.0547 0.0204 [Data for Vehicle Types 14 through 23 omitted]
24 0. 392 0.457 0.117 0.034 0.344 0.497 0.129 0.030 0.338 0.497 0.135 0.029 0.349 0.492 0.129 0.030 0.346 0. 497 0.127 0. 030 0.333 0.509 0.129 0.029 0.324 0.516 0.132 0.028 0.334 0.506 0.131 0.029 0.334 0.506 0.131 0.029 0.320 0.519 0.134 0.028 0.330 0.506 0.135 0.029 0. 312 0.521 0.140 0.027 0.295 0.538 0.141 0. 026 0.310 0.527 0.137 0.027 0.329 0.510 0.133 0.029 0.343 0.497 0.131 0.030 0.381 0.460 0.126 0.033 0.405 0.437 0.123 0.035 0.426 0.418 0.118 0.037 0.443 0.403 0.115 0.039 0.457 0.394 0.110 0.040 0.461 0. 391 0 .107 0.040 0.453 0.400 0.108 0. 039 0.418 0.434 0.112 0.036 [Data for Vehicle Types 25 through 28 omitted; the file ends after Vehicle Type 28.]

VMT by Hour ofthe Day TheMOBILE6.2 default file is HVMT.D. Themost current Chicago-area-specific file, derived from 2007 modeling output from CMAP, is shownbelow. Again, this file contains "commented-out" data from previous files for comparisonpurposes.
VMT BY HOUR * Fraction of all vehicle miles traveled by hour of the day. * First hour is 6 a.m. These data are for the Chicago NAA for * 2007, derived from CMAP VbyHr07.def file based * upon his run iepa07 300_20070830, VMT for 2007. * * IEPA estimates are based on CMAP data, but assume VMT in multi-hour * modeling periods is distributed as the default is distributed across * the hours in q1..1estion. Calculations made from VbyHr07. def ] * in accordance with USEPAU.S.EPA guidance on the subject. See M6 Technical Guidance * Document (Jan 1 02) Section 4.3.3 for details.

530.03358 0.07039 0.06240 0.07658 0.05870 0.06327 0.06609 0.06207 0.06693 0.07118 0.07991 0.07507 0.05924 0.04599 0.02160 0.01851 0.01360 0.01010 0.00757 0.00603 0.00568 0.00561 0.00687 0.01304 * Here are RP's original fractions from VbyHr07.def * 0.033579 0.066392 0.066392 0.076578 0.062532 0.062532 * 0.062532 0.062532 0.069056 0.069056 0.077490 0.077490 * 0.052616 0.052616 0.010861 0.010861 0.010861 0.010861 * 0.010861 0.010861 0.010861 0.010861 0.010861 0.010861 * These following are the default values from HVMT.DEF * * * * * * * * * * supplied for comparison. 0.0569 0.0740 0.0655 0.0555 0.0636 0.0264 0.0080 0.0540 0.0777 0.0194 0.0098 0.0582 0.0730 0.0144 0.0186 0.0608 0.0501 0.0108 0.0571 0.0389 0.0086 Following are SL's

runs made in 2002 0.0443 0.0851 0.0609 0.0572 0.0598 0.0308 0.0081 original HVMTCH07 fractions based upon DE's '07 model (for information) 0.0755 0.0577 0.0541 0.0583 0.0659 0.0701 0.0818 0.0769 * 0.0576 0.0447 0.0219 0.0188 0.0138 0.0102 * 0.0077 0.0061 0.0058 0.0057 0.0070 0.0132 All these Hourly-VMT files show similar profiles, withmorning and afternoonpeaks, a noontime dip, and aminimum about 3AM- 4AM. VMT by Speed Bin TheMOBILE6.2 default file is SVMT.D. The Chicago-area-specific Speed-bin file is VbySpd07.DEF, shown below. It represents 2007 CMAP transportation model output, deemedrepresentative for 2008 and 2009 as welL Since it is a "wide" file (at least 90 columns), it is shown here in a smaller-than-usual typeface to make it easier to read

SPEED VMT

1 1 0.0001 0.0000 0.0050 0.0075 0.0043 0.0103 0.0253 0.0254 0.0452 0.0638 0.1040 0.3767 0.1943

0.1383 1 2 0.0001 0.0080 0.0148 0.0466 0.0625 0.0859 0.0908 0.1456 0.1013 0.1130 0.1416 0.1285 0.0299

0.0316 1 3 0.0001 0.0080 0.0148 0.0466 0.0625 0.0859 0.0908 0.1456 0.1013 0.1130 0.1416 0.1285 0.0299

0. 0316 1 4 0.0001 0.0048 0.0307 0 0799 0.0662 0.0918 0.1283 0.1232 0.0962 0.1322 0.1209 0 0715 0.0286

0.0256 1 5 o.oooo 0.0002 0.0012 0.0103 0.0282 0.0531 0.0824 0.0971 0.1819 0.1460 0.1768 0.1341 0 0358

0.0529 6 o.oooo 0.0002 0.0012 0.0103 0.0282 0.0531 0.0824 0.0971 0.1819 0.1460 0.1768 0.1341 0.0358 0.0529 1 7 0.0000 0.0002 0.0012 0.0103 0.0282 0.0531 0.0824 0.0971 0.1819 0.1460 0.1768 0 1341 0.0358

0.0529 1 8 0.0000 0.0002 0.0012 0.0103 0.0282 0.0531 0.0824 0.0971 0.1819 0.1460 0.1768 0.1341 0.0358

0.0529 1 9 0.0000 0.0002 0.0044 0.0256 0.0476 0.0554 0.0941 0.1110 0.1631 0.1493 0.1555 0.1277 0.0264

0.0395 1 10 o.oooo 0.0002 0.0044 0.0256 0.0476 0.0554 0.0941 0.1110 0.1631 0.1493 0.1555 0 1277 0.0264

0.0395 1 11 0.0000 0.0083 0.0147 0.0337 0.0587 0.0474 0.0728 0.1249 0.1122 0.1205 0.1318 0.1771 0 0449

0.0530 1 12 0.0000 0.0083 0.0147 0.0337 0.0587 0.0474 0.0728 0.1249 0.1122 0.1205 0.1318 0.1771 0.0449

0.0530 1 13 o.oooo 0.0001 0.0044 0.0012 0.0133 0.0118 0.0238 0.0312 0.0561 0.0519 0.1358 0.3491 0.1903

0.1310 1 14 o.oooo 0.0001 0.0044 0.0012 0.0133 0.0118 0.0238 0.0312 0.0561 0.0519 0.1358 0.3491 0.1903

0.1310

5415 0.0000 0.0000 0.0000 0.0000 .0000 .0000 0.0023 0.0201 .0151 0.0416 .0454 0.0992 0.6347 0.1414 16 0.0000 .0000 0.0000 0.0000 0.0000 .0000 .0023 .0201 .0151 .0416 0.0454 0.0992 0.6347 0 .1414 1 17 0.0000 .0000 .oooo 0.0000 0.0000 .0000 .0023 .0201 .0151 .0416 0.0454 0.0992 0.6347

0.1414 1 18 0.0000 .0000 .0000 0.0000 0.0000 .0000 0.0023 0.0201 .0151 0.0416 .0454 0.0992 0.6347

0.1414 1 19 0.0000 0.0000 0.0000 0.0000 .0000 0.0000 0.0023 0.0201 .0151 0.0416 0.0454 0.0992 0.6347

0.1414 1 20 0.0000 .0000 0.0000 0.0000 0.0000 0.0000 .0023 .0201 .0151 .0416 0.0454 0.0992 0.6347

0.1414 1 21 0.0000 .0000 .0000 0.0000 0.0000 .0000 0.0023 0.0201 .0151 0.0416 .0454 0.0992 0.6347

0.1414 1 22 0.0000 0.0000 0.0000 0.0000 .0000 0.0000 0.0023 .0201 .0151 0.0416 0.0454 0.0992 0.6347

0.1414 1 23 0.0000 .0000 0.0000 0.0000 0.0000 .0000 .0023 .0201 0.0151 0.0416 .0454 0.0992 0.6347

0.1414 24 0.0000 .0000 .0000 0.0000 0.0000 .0000 0.0023 0.0201 .0151 0.0416 0.0454 0.0992 0.6347 0.1414 2 1 0.0000 .0008 .0034 0.0102 .0177 .0367 0.1027 0.1775 .1839 .2465 0.0867 0.1338 0.0000

0.0000 2 2 0.0017 0.0254 0.0689 0.0968 0.1127 0.1207 .14'52 .1356 .1088 .0924 .0445 0.0474 0.0000 0.0000 2 3 0.0017 0.0254 0.0689 0.0968 0.1127 .1207 0.1452 0.1356 .1088 0.0924 0.0445 0.0474 0.0000 0.0000 2 4 0.0050 .OS31 .1042 0.1302 0.1335 .1256 0.1265 0.1096 .0819 .0645 0.0314 0.0345 0.0000

0.0000 2 5 0.0003 .0070 0.03?.9 0.0740 .1233 0.1356 .1577 .1579 .1184 0.0963 .0417 0.0547 0.0000

0.0000 2 6 0.0003 .0070 0.0329 0.0740 0.1233 0.1356 .1577 0.1579 .1184 0.0963 0.0417 0.0547 0.0000 0.0000 2 7 0.0003 0.0070 0.0329 0.0740 0.1233 .1356 0.1577 0.1579 .1184 .0963 .0417 0.0547 0.0000 0.0000 2 8 0.0003 .0070 0.0329**0.07~0** 0.1233 0.1356 .1577 0.1579 0.1184 0.0963 0.0417 0.0547 0.0000

0.0000 2 9 0.0008 0.0120 0.0470 0.0938 0.1316 .1388 0.1523 0.1449 .1091 0.0837 0.0382 0.0476 .0000 0.0000 10 0.0008 0.0120 0.0470 0.0938 .1316 .1388 .1523 0.1449 0.1091 0.0837 0.0382 0.0476 0.0000 0.0000 2 11 0.0032 .0375 0.0866 0.1239 .1277 0.1268 0.1365 0.1206 .0909 .0680 0.0356 0.0428 0.0000 0.0000 2 12 0.0032 .0375 0.0866 0.1239 0.1277 .1268 0.1365 0.1206 .0909 .0680 .0356 0.0428 0.0000

0. 0000 2 13 0.0000 0.0015 0.0097 0.0286 0.0596 .0997 0.1556 .1827 0.1639 0.1548 0.0635 0.0805 0.0000

0.0000 2 14 0.0000 0.0015 0.0097 0.0286 .0596 .0997 .1556 0.1827 .1639 0.1548 0.0635 0.0805 0.0000 0.0000 2 15 0.0000 0.0000 0.0000 0.0000 .0000 0.0003 .0615 0.1295 .1536 .3574 0.0745 0.2231 0.0000 0.0000 2 16 0.0000 .0000 0.0000 0.0000 0.0000 .0003 0.0615 0.1295 .1536 0.3574 0.0745 0.2231 0.0000

0. 0000 2 17 0.0000 0.0000 0.0000 0.0000 0.0000 0.0003 0.0615 .1295 .1536 0.3574 0.0745 0.2231 0.0000

0.0000 2 18 0.0000 0.0000 0.0000 0.0000 .0000 0.0003 .0615 0.1295 .1536 .3574 0.0745 0.2231 0.0000

0. 0000 2 19 0.0000 0.0000 0.0000 0.0000 0.0000 .0003 0.0615 .1295 0.1536 0.3574 0.0745 0.2231 0.0000 0. 0000 2 20 0.0000 .0000 0.0000 0.0000 0.0000 .0003 0.0615 0.1295 0.1536 0.3574 .0745 0.2231 .0000 0.0000 2 21 0.0000 .0000 0.0000 0.0000 .0000 0.0003 0.0615 0.1295 .1536 .3574 0.0745 0.2231 0.0000

0. 0000 2 22 0.0000 0.0000 .0000 0.0000 0.0000 .0003 0.0615 0.1295 .1536 0.3574 0.0745 0.2231 0.0000 0.0000 2 23 0.0000 0.0000 0.0000 0.0000 0.0000 .0003 0.0615 0.1295 0.1536 0.3574 0.0745 0.2231 0.0000 0.0000 2 24 o.oooo 0.0000 0.0000 0.0000 0.0000 0.0003 .0615 0.1295 .1536 .3574 0.0745 0.2231 0.0000 0.0000
* Comments are not allowed before the end of the data!

Fraction of vehicle miles traveled within an hour within an average speed bins by hour of the day. The first- hour is 6 a.m. Speed Bins: Hr 2.5 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0 65. 0+

These values developed from run iepa07 300 20070830 by CMAP, and were calculated in December 2007.



### 55Speed bins extend 2.5 mph on either side ofthe bin name (i.e., the 30-mph speed bin encompasses speeds from 27.5 to 32.5 mph), except for the first (2.5 mph) bin (0 to 2.5 mph) and the last (65+ mph) bin (62.5 mph and above). The information in this file strictly speaking represents a speed distribution for 2007, but is assumed (after discussion with CMAP) to be reasonably valid throughout the 2000- 2010+ period. The above data are for the Chicago NAA and for Freeways and Arterials only. See M6 User's Guide Sec. 2.8.8.2.c and Appendix B, Table 5: "Average SpeedRanges for Speed Bins (SPEED VMT Command)" for further information about this file and its use. See also the default VMT-by-speed file SVMT.DEF for more infom1ation and comments. The first numberin each line is roadway type: 1 =Freeways; 2 =Arterials. Locals and Ramps have a fixed speed inbuilt into theM6 model, and therefore are not affected by this file. The second number is the hour ofthe day, hour I being [hour begillling at] 6 AM, andhonr24 being [hour beginning at] 5 AM the next day. The third and subsequent numbers are the fractions ofVMT in that hour that occur within the specified speedbins. Note that, for Freeways, most VMTis in the 45-50-55-60-mph speedbins, with lower speeds more common during Peak hours. Much the same holds for Arterials, where most VMT is in the 30-35-40-45 mph speed bins.

56