# STATE OF 

# COLORI\00 John W . Hicken looper , Governor Larry Wolk , MD , MSPH

Executive Director and Chief Medical Officer Dedicated to protecting and i mproving the health and env i ronment of the people of Colo rado 4300 Cherry Cree k Dr . S . Laboratory Services Divis ion Denver , Colorado 80246-1530 8100 Lowry Blvd . Phone (303) 692 -2000 Denver , Colorado 80230-6928 Located i n G l enda le , Co l orado (303) 692-3090 www.colorado .gov/cdphe 

### January 27, 2014 Shaun McGrath Regional Administrator U.S. Environmental Protection Agency, Region 8 1595 Wynkoop Street Denver, CO 80202-1129 RE: 2013 Colorado Designations for Annual PM2 . 5 NAAQS Dear Mr. McGrath: Colorado Department 

### ofPublic Health and Environment



### Pursuant to the provisions of section 107(d)(1) of the Clean Air Act, the state of Colorado submits to the Environmental Protection Agency the attached area designations for the Annual PM2.5 National Ambient Air Quality Standard (NAAQS) , as revised on December 14, 2012. Federal law requires that the state of Colorado submit the recommended designations for the revised Annual PM2.5 NAAQS to the EPA by December 12 , 2013 , and this letter provides the designations of " attainment" and "attainment/unclassifiable" as applicable for all air quality control regions (AQCRs) in Colorado. The enclosed table and map describes each AQCR and its designation along with an enclosed technical support document that provides supporting analysis. The technical support document makes a strong case that these designation recommendations are accurate and supportable for EPA approval. The attainment designation for six Colorado AQCRs (02 , 03 , 04 , 07 , 09 and 11) and attainment/unclassifiable designations for those areas with limited monitoring are based on actual air quality monitoring data for the 2010-2012 time periods. The attainment/unclassifiable designations for areas lacking representative monitoring are based on the state ' s estimation that Annual PM2.5 levels in these AQCRs are not out of compliance with the Annual PM2.5 NAAQS. RECEIVED U.S. EPA Region 8 RA'sOffice 

## JAN 

# 2 9 2014

### The enclosed area classifications for the 2012 Annual PM2.5 NAAQS were approved by the Colorado Air Quality Control Commission following a public hearing held on October 17, 2013. If you have any questions regarding this submittal, please contact Mike Silverstein, Administrator for the Commission, at (303) 692-3478, or William Allison, Director ofthe Air Pollution Control Division, at (303) 692-3114.

Executive Director cc: Mike Silverstein, Administrator AQCC Garry Kaufman, Deputy Division Director APCD Enclosures Colorado Designations for Annual2012 PM2.5 NAAQS- Table and Map State of Colorado, Technical Support Document, For Recommended Annual PM2.5 Designations

2Colorado Designations for 2012 Annual PM2.5 NAAQS (based on 2010-2012 monitoring data) Air Quality Control Regions (AQCR) PM2 . 5 NAAQS Designation State AQCR 01 AttainmenUUnclassifiable Logan County Morgan County Phillips County Sedgwick County Washington County Yuma County State AQCR 02 Larimer County Weld County State AQCR 03 Adams County Arapahoe County Boulder County (including the portion of Rocky Mountain National Park therein) Broomfield County Clear Creek County Denver County Douglas County Jefferson County Gilpin County State AQCR 04 El Paso County Park County Teller County State AQCR 05 Cheyenne County Elbert County Kit Carson County Lincoln County State AQCR 06 Baca County Bent County Crowley County Kiowa County Otero County Prowers County State AQCR 07 Huerfano County Las Animas County Pueblo County 

### Table of AQCR Designations 24-Hour PM2.5 NAAQS 1 Attainment Attainment

Attainment

AttainmenUUnclassifiable

AttainmenUUnclassifiable

Attainment



### November 6, 2013Colorado Designations for 2012 Annual PM2.5 NAAQS (based on 201 0-2012 monitoring data ) Air Quality Control Regions (AQCR) State AQCR 08 Alamosa County Conejos County Costilla County Mineral County Rio Grande County Saguache County State AQCR 09 Archuleta County (part) excluding Southern Ute Indian Tribe (SUIT) lands Dolores County La Plata County (part) excluding SUIT and Ute Mountain Ute Tribe lands Montezuma County (part) excluding SUIT and Ute Mountain Ute Tribe lands San Juan County State AQCR 10 Delta County Gunnison County Hinsdale County Montrose County Ouray County San Miguel County State AQCR 11 Garfield County Mesa County Moffat County Rio Blanco County State AQCR 12 Eagle County Grand County Jackson County Pitkin County Routt County Summit County State AQCR 13 Chaffee County Custer County Fremont County Lake County



### Table of AQCR Designations 24-Hour PM2 .5 NAAQS 2 PM2 . 5 NAAQS Designation Attainment/Unclassifiable

Attainment

AttainmenUUnclassifiable

Attainment

Attainment/Unclassifiable

AttainmenUUnclassifiable



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## Map of Air Quality Control Regions for Annual PM2.5 Designations in Colorado.

# State of Colorado

Technical Support Document For 2012 Annual PM2.5 Standard Attainment In Colorado

November 6, 2013 Colorado Department of Public Health and Environment Air Pollution Control Division 4300 Cherry Creek Drive South Denver, Colorado 80246

## Contents Des ignation Recommendation ........................... . . .. . .. ..... ... . .. ........................... .. ................ . ......... 3 Overview ................ . .. . ...................................... . . ... ........ ... . . ............................... .. ...... . ................. 3 Air Quality Data ...... . .... . ..................... .... . . .... ... ..... . .. ........ . .. ............... . ..... . ................. .. ...... .. ... . .... 3 Figure 1. Map of PM2.5 Ambient Air Monitoring Sites 2013. .......... . ...... . . ... ........... ... . ..... . ... . .... .... . . . . .... . . ..... . .... .4 Figure 2. Colorado Annual PM2.5 Ambient Air Concentration Trends. ............................................................ 

### 5 Table 1. Colorado 3 year average Annual PM2. 5 Monitoring Data Summary. . ....... . . .. . ... ...... . .... . ...... . .... ... ..... . .5 Table 2. Den ver-Boulder Area 3-year average Annual PM2.5 Monitoring Data Summary............................... 6 Table 3. North Front Range Area 3-year average Annual PM2.5 Monitoring Data Summary ..... ..................... 6 Table 4. South Front Range Area 3-year average Annual PM2.5 Monitoring Data Summary. ......................... 

### 7 Table 5. Western Colorado 3-year average Annual PM2.5 Monitoring Data Summary. .......... ............ .. ........ ... 7 

### Summary Conclusions . . . . .. .............. .......... . . .... ............................................................. . .............. 8 Table 6. Recommended Annual PM2 . 5 Designations byAreafor Colorado .................................................... .. 8 Figure 3. Map of Air Quality Control Regions for Annual PM2.5 Designations in Colorado ................ ...... .. .. 11



### Colorado Recommended PM2.5 Designations Technica l Support Document November 6 2013 Page 2 of 11

## Colorado Analysis for Annual PM2.5 Attainment Designation Recommendation The State recommends that the entire state of Colorado be designated as attainment or attainment/unclassifiable for the 2012 revised Annual PM 2.5 standard. This recommendation is based on monitoring information that indicates the region is in compliance with the revised Annual PM2.5 standard. Overview On December 14 , 2012 , the U.S. Environmental Protection Agency (EPA) signed final rulemaking that revises the Primary Annual Particulate Matter (PM2.5) National Ambient Air Quality Standard (NAAQS). The PM2.5 level has been lowered to 12 Jlg/m 3 

### annual mean, averaged over 3 years. States are required to submit area designations to EPA by December 12, 2013. The Air Pollution Control Division (APCD) currently operates 16 PM2.5 monitors in Colorado, (8 sites in the Denver Metro Area, 3 sites in the North Front Range, 3 sites in the South Front Range , and 2 sites on the West Slope). All PM2.5 monitoring for the most recent 3-year period shows annual values well below the level ofthe NAAQS. Thus , the APCD is proposing that Colorado be designated as attainment/unclassifiable for the entire state (excluding tribal lands over which the APCD has no jurisdiction) . The EPA requires states base their designations on monitoring data results over a three year period for calendar years 2010-2012. Based on the 2010-2012 results , Colorado is in attainment of the new standard. The following analysis discusses air quality data as necessary to demonstrate that Colorado should be designated as attainment or attainment/unclassifiable for the new Annual PM2.5 NAAQS. It 

### must also be noted that this attainment demonstration applies only to non-tribal lands over which the State of Colorado has direct air quality jurisdiction. Air Quality Data The air quality analysis looked at all known monitoring sites for the annual PM2.5 standard in Colorado for 2010 through 2012. A map ofthe 16 APCD PM2 .5 monitoring sites is shown in Figure 1. Other, non-APCD sites are also shown in Figure 1. Figure 2 presents long term trends for the APCD PM2 .5 sites . It 

### is evident that ambient annual PM2.5 levels have decreased over time. Much of this decrease is likely due to emissions reductions in vehicles and major stationary sources as well as local constraints on wood burning stoves. The 3-year average Annual PM2.5 data for 2010 to 2012 are presented in Table 1. 

### Colorado Recommended PM2.5 Designations Technical Support Document November 6 2013 Page 3 of 11

### Figure 1. 

### Map of Colorado PM2.5 AmbientAir Monitoring Sites 2013.

Colorado Recommended PM2 . 5 Designations Technical Support Document November 6 2013 

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### Figure 2. Colorado Annual PM2.5AmbientAir Concentration Trends. 

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### Table 1. Colorado 3 year average Annual PM2.5 Monitoring Data Summary. Statewide Year Maximum (!Jg/m3) 1999-2001 10 .53 2000-2002 10.93 2001-2003 10.83 2002-2004 11.71 2003-2005 10 .51 2004-2006 10 .29 2005 -20 07 9.60 2006-2008 10 .02 2007-2009 9.44 2008-2010 9.28 2009-2011 8.61 2010-2012 8.21



### Colorado Recommended PM 2.5 Designations T

echnical Support Document No vember 6 2013 Locatio n ity AMP Adams C Denver- ( Denver-C Grand Jct-P Grand Jct-P Denver- Sw Commerce Commerce Grand Jct- P Grand Jct-P Grand Jct-P AMP owell owell an sea

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### Page 5 of 11

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a ummary. Boulder Denver Denver Denver Adams Commerce Arapahoe Chamber CAMP Swansea DMAS Chatfield City Alsup Comm . Coli. Year 08-013-0012 08-031-0002 08-031-0023 08 -031 -0025 08-035-0004 08-001-0001 08-001 -0006 08-005-0005 1999-2001 7.83 10 .37 10 .5 3 8 .77 2000 -2002 8 .27 10.93 8.83 2001 -2003 8 .03 1 0.83 10.67 8 .77 2002 -2004 7.47 9.99 10.47 8 . 35 2003 -2005 7.07 9 .72 9 .84 8 . 65 2004-2006 6.81 9 .04 10 .29 5.24 9 . 34 8 . 36 2005-2007 7.04 9 .05 8.85 6 . 25 9 . 60 8 .51 2006-2008 6.87 8.63 8 . 22 6 . 32 10.02 7.64 2007-2009 6 .77 8 . 32 8.71 8 . 37 6.16 9.43 7 .24 2008 -2010 6.49 7.80 7 .90 7.64 5.75 8 .72 6.71 2009-2011 6.27 7.62 7 .51 7.25 5 .68 8 .08 6.29 2010 -2012 6 . 30 7.80 7.59 7.57 8.21 6.40 

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# . om ortnf? Data Summar y . Longmont Ft Collins 

## csu Year 08 -013-0003 08-069-0009 1999 -2001 9 .20 8 . 10 2000 -2002 9 .50 8.20 2001-2003 9 . 37 7.87 2002 -2004 8 .92 7.56 2003 -2005 8 .52 7.32 2004-2006 8.14 7 . 32 2005-2007 8 .25 7.42 2006 -2008 8.19 7.31 2007-2009 7.96 7 . 13 2008 -2010 7 . 37 6 . 64 2009 -2011 6 .92 6.32 2010 -2012 6 . 89 6 .57



### Co lorado Recommend ed P M2. 5 Des i g nations T

echn ica l Supp ort Do cument November 6 2 013 Greeley Plateville Hospital 08- 123-0006 08- 123-0008 8.67 9 . 23 9 . 10 9 .57 9.03 9.60 8 .51 8 .82 8 . 15 8.49 8 .08 8 . 61 8.36 9 . 29 8 . 36 9.30 8 . 24 8.68 7 . 61 7 .79 7 . 26 7.50 7.35 7.80



### Page 6 o f 11

### Table4. e Annual PM2.5 Monitoring_ Data Summarv. Colo Spg Colo Spg Colo Spgs Pueblo Pueblo Colorado Public Fountain Magnet Meadow RBD College Works School Elbert Year 08-041-Q008 08-041-0011 08-041-0017 08 - 101-0012 08-101-0015 08-039-0001 1999 -2001 7 .03 7.40 7.70 4.03 2000-2002 6.97 7.70 8 .03 4.27 2001-2003 6 .97 7.83 7.97 4.43 2002 -2004 6 .76 8 .08 7.39 4.36 2003 -2005 6 .76 8.05 7.19 4.46 2004-2006 6 .73 8.10 7 .56 4.29 2005 -2007 7.77 7.79 4 .55 2006-2008 7.80 7 .82 4.42 2007 -2009 7.40 4.35 2008-2010 5.97 4.17 2009 -2011 5.88 5 . 65 4 .00 2010 -2012 6.40 6.29 4 .05 

### Table 

### 5. Western Colorado 3- ear avera e Annual PM2.5 Monitoring Data Summary. Mt Cr Butte Durango Grand Jet Town Ctr School MCHD Year 08-051-0005 08-067-0008 08-077-0003 1999-2001 6.25 4.85 7.33 2000-2002 6.50 5.23 7.73 2001-2003 6.93 5.70 7 . 83 2002-2004 6 . 64 2003-2005 6 . 34 2004-2006 2005-2007 2006-2008 2007-2009 2008-2010 2009-2011 2010-2012



### Colo rado Recommend ed PM 2 .5 D es ignations T

echnical Suppo rt Do c ument Nove mb e r 6 2 013 Grand Jet Powell Cortez Telluride 08-o77-0017 08-083-Q006 08-113-0004 5 . 80 5.67 11.71 5 .05 10 .51 4.82 9 .51 8 .55 9 .20 9 .43 9.44 9 .28 6 . 25 8.61 6.29 7.80 5.91



### Page 

### 7 of 11

.......

### Summary Conclusions The data and analysis presented provide documentation and compelling evidence supporting a finding that Colorado should be designated as attainment or attainment/unclassifiable for the 2012 Annual PM2.5 NAAQS. 

### It is important to note that only areas over which Colorado has direct air quality jurisdiction are included in this attainment attainment/unclassifiable finding and recommendation. The Southern Ute Indian Tribe, and the Southern Ute Indian Tribe/State of Colorado Environmental Commission , as well as the Ute Mountain Ute Indian Tribe, are distinct nations or entities and consequently such Tribal lands are specifically excluded from this designation recommendation. Table 6 provides a complete listing ofthe recommended designations, by area. Figure 3 provides a map of the Air Quality Control Regions for the Annual PM2.5 Designations in Colorado. These recommendations are based on monitoring information that indicates compliance with the revised standard. 

### Table 6. RecommendedAnnual PM2.5 Designations by Area for Colorado 2013 Colorado Designations for Annual PM2.5 NAAQS (based on 201 0-2012 monitoring data ) Air Quality Control Regions (AQCR) PM2.5 NAAQS Designation State AQCR 01 Logan County Morgan County Phillips County Sedgwick County Washington County Yuma County State AQCR 02 Larimer County Weld County State AQCR 03 Adams County Arapahoe County Boulder County (including the portion of Rocky Mountain National Park therein) Broomfield County Clear Creek County Denver County Douglas County Jefferson County Gilpin County State AQCR 04 El Paso County Park County Teller County 

### Colorado Recommended PM2.5 Designations Technical Support Document November 6 2013 AttainmenUUnclassifiable

Attainment Attainment

Attainment


### Page 8 of 112013 Colorado Designations for Annual PM2 . 5 NAAQS (based on 2010-2012 monitoring data) Air Quality Control Regions (AQCR) PM2.5 NAAQS Designation State AQCR 05 AttainmenUUnclassifiable Cheyenne County Elbert County Kit Carson County Lincoln County State AQCR 06 Baca County Bent County Crowley County Kiowa County Otero County Prowers County State AQCR 07 Huerfano County Las Animas County Pueblo County State AQCR 08 Alamosa County Conejos County Costilla County Mineral County Rio Grande County Saguache County State AQCR 09 Archuleta County (part) excluding Southern Ute Indian Tribe (SUIT) lands Dolores County La Plata County (part) excluding SUIT and Ute Mountain Ute Tribe lands Montezuma County (part) excluding SUIT and Ute Mountain Ute Tribe lands San Juan County State AQCR 10 Delta County Gunnison County Hinsdale County Montrose County Ouray County San Miguel County State AQCR 11 Garfield County Mesa County Moffat County Rio Blanco County 

### Colorado Recommended PM2.5 Designations Technical Support Document November 6 2013 AttainmenUUnclassifiable

Attainment
AttainmenUUnclassifiable

Attainment

AttainmenUUnclassifiable

Attainment


### Page 9of 112013 Colorado Designations for Annual PM2.5 NAAQS (based on 2010-2012 monitoring data) Air Quality Control Regions (AQCR) State AQCR 12 Eagle County Grand County Jackson County Pitkin County Routt County Summit County State AQCR 13 Chaffee County Custer County Fremont County Lake County



### Colorado Recommended PM2.5 Designations Technical Support Document November 6 2013 PM2.5 NAAQS Designation Attainment/Unclassifiable

Attainment/Unclassifiable



### Page 10 of 11

### Figure 3. Map of Air Quality Control Regions for AnnualPM2.5 Designations in Colorado

A CR S

AQCR 6

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### Colorado Recommended PM2 . 5 Des ignations Technical Support Document Novemb er 6 2013 Page 11 of 11