Annex A. Atmospheric Science 

YukonKoyukuk

Alaska

0

0

0

670

1,458

92

6,613

0

19,136

145,340

88,239

23,049

1,697

8,403,258

0 2,000,000 4,000,000 6,000,000 8,000,000 10,000,000

SOLVENT UTILIZATION

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WASTE DISPOSAL & RECYCLING

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FIRES

NON-ROAD EQUIPMENT

ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Yukon-Koyukuk Census Area

0

0

2,494

3,758

406

52

0

0

0

0

8,095,364

0

0

0

0 2,000,000 4,000,000 6,000,000 8,000,000 10,000,000

SOLVENT UTILIZATION

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ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Figure A-1. CO emissions density map and distribution for the state of Alaska and for YukonKoyukuk County in Alaska. 

January 2010 A-1 
Weber

Utah

Grand

Utah

14

91

13

19

1,312

37,877

4,252

2,314

3,733

153

41,697

271,971

183,533

764,676

136,584

0 250,000 500,000 750,000 1,000,000

SOLVENT UTILIZATION

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ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Weber County

2

8

0

0

25

2,038

73

2

37

0

1,521

985

932

11,842

45,690

0 25,000 50,000

SOLVENT UTILIZATION

MISCELLANEOUS

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FIRES

NON-ROAD EQUIPMENT

ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Utah County

0

12

0

1

48

38

1

1,258

369

2

3,599

88,391

20,120

3,019

4,769

0 25,000 50,000 75,000 100,000

SOLVENT UTILIZATION

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ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Grand County

0

0

0

0

0

5

0

0

1

0

992

7,219

2,596

6,596

3,939

0 2,500 5,000 7,500 10,000

SOLVENT UTILIZATION

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NON-ROAD EQUIPMENT

ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Figure A-2. CO emissions density map and distribution for the state of Utah and for selected 

counties in Utah. 

January 2010 A-2 
Suffolk

Middlesex

Norfolk

Massachusetts

11

68

17

78

29

870

11,569

105

21,970

3,861

119,337

703

441,814

960,011

10,807

0 250,000 500,000 750,000 1,000,000

SOLVENT UTILIZATION

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SOILS

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NON-ROAD EQUIPMENT

ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Middlesex County

224,697

92,849

2

10

0

0

1

179

492

31

5,465

321

19,297

73

1,024

0 25,000 50,000 75,000 100,000 125,000 150,000 175,000 200,000 225,000 250,000

SOLVENT UTILIZATION

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NON-ROAD EQUIPMENT

ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Norfolk County

160,676

42,121

54

9,700

285

2,161

0

189

71

18

76

0

4

2

670

0 50,000 100,000 150,000 200,000

SOLVENT UTILIZATION

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Emissions (tons)

Anthropogenic

Biogenic

Suffolk County 

30,901

66,491

0

0

0

0

11

114

225

0

1,295

1

3,022

99

254

0 25,000 50,000 75,000

SOLVENT UTILIZATION

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NON-ROAD EQUIPMENT

ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Figure A-3. CO emissions density map and distribution for the state of Massachusetts and 

for selected counties in Massachusetts. 

January 2010 A-3 
Fulton

Dekalb

Chatham

Liberty

Glynn

Georgia 

11

68

17

960,011

441,814

119,337

3,861

21,970

105

11,569

870

29

78

182,591

703

0 250,000 500,000 750,000 1,000,000 1,250,000

SOLVENT UTILIZATION

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SOILS

FIRES

NON-ROAD EQUIPMENT

ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Fulton County 

0

28

0

0

0

0

233

41

1,384

279

3,729

221,739

65,982

67

825

0 50,000 100,000 150,000 200,000 250,000

SOLVENT UTILIZATION

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SOILS

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NON-ROAD EQUIPMENT

ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Dekalb County 

62,735

141,889

0

0

5

1

0

102

0

988

254

2,938

0

812

1

0 25,000 50,000 75,000 100,000 125,000 150,000 175,000

SOLVENT UTILIZATION

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NON-ROAD EQUIPMENT

ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Figure A-4. CO emissions density map and distribution for the state of Georgia and for 

selected counties in Georgia (Figure 1 of 2). 

January 2010 A-4 
Chatham County

24,908

54,182

0

0

0

18

0

1,831

189

1,635

73

1,168

0

1,315

561

0 25,000 50,000

SOLVENT UTILIZATION

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SOILS

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NON-ROAD EQUIPMENT

ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Liberty County

0

3,423

15,423

11,018

256

55,427

52

0

0

373

0

12

0

0

1,626

0 25,000 50,000

SOLVENT UTILIZATION

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Emissions (tons)

Anthropogenic

Biogenic

` 

Glynn County

0

0

0

0

0

6,619

377

0

3,002

1,129

188

1,504

390

10,619

21,140

0 5,000 10,000 15,000 20,000 25,000

SOLVENT UTILIZATION

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ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Figure A-5. CO emissions distribution for selected counties in Georgia (Figure 2 of 2). 

January 2010 A-5 
Los 

Angeles

San 

Diego

Orange

California

3,436,059

1,170,637

736,797

410,414

321,342

22,261

85,727

498

28,707

16,763

7,225

351

277

14,322

290

0 1,000,000 2,000,000 3,000,000 4,000,000

SOLVENT UTILIZATION

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SOILS

FIRES

NON-ROAD EQUIPMENT

ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Los Angeles County

2

86

1

12

2,425

500

9,814

79

24,537

142

10,927

8,085

63,164

212,892

824,676

0 250,000 500,000 750,000 1,000,000

SOLVENT UTILIZATION

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NON-ROAD EQUIPMENT

ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

San Diego County

0

5,260

0

0

132

98

895

0

4,935

162

25,768

10,580

62,392

101,515

283,597

0 100,000 200,000 300,000 400,000

SOLVENT UTILIZATION

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ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Orange County

1

18

0

0

17

46

655

0

3,761

107

3,593

2,374

1,145

103,377

220,477

0 100,000 200,000

SOLVENT UTILIZATION

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ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Figure A-6. CO emissions density map and distribution for the state of California and for 

selected counties in California. 

January 2010 A-6 
Jefferson

Alabama

216

128

174

5,721

13,619

48,004

11,212

38,247

67,132

104,914

71,052

146,582

308,000

389,081

1,237,459

0 500,000 1,000,000 1,500,000

SOLVENT UTILIZATION

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ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Jefferson County

181,846

47,932

546

2,655

2,888

2,176

38,088

27,010

3,360

13,592

145

5

54

19

8

0 50,000 100,000 150,000 200,000

SOLVENT UTILIZATION

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ON-ROAD VEHICLES

Emissions (tons)

Anthropogenic

Biogenic

Figure A-7. CO emissions density map and distribution for the state of Alabama and for 

Jefferson County in Alabama. 

January 2010 A-7 
Table A-1. Listing of all CO monitors currently in use, along with their limits of detection. 

Method Code Method Description Reference Method Id Fed MDL (ppm) 

008 BENDIX 8501-5CA RFCA-0276-008 0.50000 

012 BECKMAN 866 RFCA-0876-012 0.50000 

018 MSA 202S RFCA-0177-018 0.50000 

033 HORIBA AQM-10--11--12 RFCA-1278-033 0.50000 

041 MONITOR LABS 8310 RFCA-0979-041 0.50000 

048 HORIBA 300E/300SE RFCA-1180-048 0.50000 

050 MASS-CO 1 (MASSACHUSETTS) RFCA-1280-050 0.50000 

051 DASIBI 3003 RFCA-0381-051 0.50000 

054 THERMO ELECTRON 48, 48C RFCA-0981-054 0.50000 

055 Gas Filter Correlation Thermo Electron 48C-TL N/A 0.04000 

066 MONITOR LABS 8830 RFCA-0388-066 0.50000 

067 DASIBI 3008 RFCA-0488-067 0.50000 

088 LEAR SIEGLER MODEL ML 9830 RFCA-0992-088 0.50000 

093 API MODEL 300 GAS FILTER RFCA-1093-093 0.50000 

106 HORIBA INSTR. MODEL APMA-360 RFCA-0895-106 0.50000 

108 ENVIRONMENT SA MODEL CO11M RFCA-0995-108 0.50000 

147 Environnement S.A. Model CO12M Co Analyzer RFCA-0206-147 0.50000 

158 HORIBA INSTR. MODEL APMA-370 RFCA-0506-158 0.50000 

167 DKK-TOA Cork Mode GFC-311E RFCA-0907-167 0.50000 

172 SIR S.A. Model S5006 RFCA-0708-172 0.50000 

554 Gas Filter Correlation Thermo Electron 48C-TLE N/A 0.04000 

588 Ecotech EC9830T RFCA-0992-088 0.04000 

593 API Model 300 EU RFCA-1093-093 0.04000 

January 2010 A-8 
Table A-2. Microscale monitors meeting 75% completeness criteria, 2005-2007. 

Monitor Code State Name City Name Traffic Count Road Type 

02-090-0002-42101-1 Alaska Fairbanks NR NR 

04-013-0016-42101-1 Arizona Phoenix 50,000 ARTERIAL 

04-019-1014-42101-1 Arizona Tucson 41,200 MAJ ST OR HY 

06-065-1003-42101-1 California Riverside 40,000 FREEWAY 

06-073-0007-42101-1 California San Diego 6,000 THRU ST OR HY 

08-013-0009-42101-1 Colorado Longmont 20,000 MAJ ST OR HY 

08-031-0002-42101-2 Colorado Denver 17,200 MAJ ST OR HY 

08-031-0019-42101-1 Colorado Denver 500 MAJ ST OR HY 

08-041-0015-42101-1 Colorado Colorado Springs 44,200 MAJ ST OR HY 

08-077-0018-42101-1 Colorado Grand Junction 13,525 THRU ST OR HY 

09-003-0017-42101-1 Connecticut Hartford 10,000 THRU ST OR HY 

11-001-023-42101-1 District Of Columbia Washington 30,000 THRU ST OR HY 

12-057-1070-42101-1 Florida Tampa 133,855 ARTERIAL 

12-086-4002-42101-1 Florida Miami 5,000 LOCAL ST OR HY 

12-095-1005-42101-1 Florida Orlando 30,000 MAJ ST OR HY 

12-103-0024-42101-1 Florida Saint Petersburg 35,000 MAJ ST OR HY 

12-103-2008-42101-1 Florida Clearwater 67,751 MAJ ST OR HY 

12-115-1004-42101-1 Florida Sarasota 31,000 MAJ ST OR HY 

13-121-0099-42101-1 Georgia Atlanta 44,000 MAJ ST OR HY 

17-031-0063-42101-1 Illinois Chicago 5,000 LOCAL ST OR HY 

17-031-6004-42101-1 Illinois Maywood NR NR 

17-143-0036-42101-1 Illinois Peoria 18,500 ARTERIAL 

17-167-0008-42101-1 Illinois Springfield 16,400 MAJ ST OR HY 

17-201-0011-42101-1 Illinois Rockford 11,400 ARTERIAL 

18-003-0011-42101-1 Indiana Fort Wayne 30430 MAJ ST OR HY 

18-089-0015-42101-1 Indiana East Chicago NR NR 

18-097-0072-42101-1 Indiana Indianapolis 21,237 MAJ ST OR HY 

18-163-0019-42101-1 Indiana Evansville 24,498 LOCAL ST OR HY 

21-111-1019-42101-1 Kentucky Louisville 22,000 MAJ ST OR HY 

27-053-0954-42101-1 Minnesota Minneapolis 29,352 MAJ ST OR HY 

27-123-0050-42101-1 Minnesota St. Paul NR NR 

27-137-0018-42101-1 Minnesota Duluth 12,000 MAJ ST OR HY 

27-145-3048-42101-1 Minnesota St. Cloud NR NR 

30-029-0010-42101-1 Montana Kalispell NR THRU ST OR HY 

30-031-0013-42101-1 Montana Not in a city 2,000 THRU ST OR HY 

33-011-1009-42101-1 New Hampshire Nashua 40,000 MAJ ST OR HY 

34-005-1001-42101-1 New Jersey Burlington 8,000 THRU ST OR HY 

34-017-1002-42101-1 New Jersey Jersey City 25,000 THRU ST OR HY 

37-067-0023-42101-1 North Carolina Winston-Salem 22,000 MAJ ST OR HY 

39-035-0048-42101-1 Ohio Cleveland 24,300 THRU ST OR HY 

January 2010 A-9 
Monitor Code State Name City Name Traffic Count Road Type 

39-035-0051-42101-1 Ohio Cleveland 16,150 MAJ ST OR HY 

39-035-0053-42101-1 Ohio Cleveland 19,550 MAJ ST OR HY 

39-049-0036-42101-1 Ohio Columbus 16,800 MAJ ST OR HY 

39-061-0021-42101-1 Ohio Cincinnati 17,250 LOCAL ST OR HY 

39-085-0006-42101-1 Ohio Mentor 25,240 MAJ ST OR HY 

39-113-0034-42101-1 Ohio Dayton 7,100 THRU ST OR HY 

39-153-0022-42101-1 Ohio Akron 13,150 MAJ ST OR HY 

41-029-0018-42101-1 Oregon Medford NR NR 

41-039-0013-42101-1 Oregon Eugene 17,500 MAJ ST OR HY 

41-051-0087-42101-1 Oregon Portland 4,150 LOCAL ST OR HY 

45-079-0020-42101-1 South Carolina Columbia 31,500 MAJ ST OR HY 

47-037-0021-42101-1 Tennessee Nashville 15,000 MAJ ST OR HY 

47-157-0036-42101-1 Tennessee Memphis 25,000 THRU ST OR HY 

48-029-0046-42101-1 Texas San Antonio 5,820 MAJ ST OR HY 

48-201-0075-42101-1 Texas Houston 6,576 LOCAL ST OR HY 

53-033-0019-42101-1 Washington Bellevue 100,000 MAJ ST OR HY 

53-063-0049-42101-1 Washington Spokane 10,000 MAJ ST OR HY 

“NR” denotes that the value was not reported. 

January 2010 A-10 
Table A-3. Middle scale monitors meeting 75% completeness criteria, 2005-2007. 

Monitor Code State Name City Name Traffic Count Road Type 

04-013-3010-42101-1 Arizona Phoenix 18,500 ARTERIAL 

06-029-0010-42101-1 California Bakersfield 30,300 ARTERIAL 

06-037-1301-42101-1 California Lynwood 35,000 ARTERIAL 

06-037-9033-42101-1 California Lancaster 2,320 LOCAL ST OR HY 

06-059-1003-42101-1 California Costa Mesa 1,000 LOCAL ST OR HY 

06-071-9004-42101-1 California San Bernardino 21,900 THRU ST OR HY 

06-085-0005-42101-1 California San Jose NR LOCAL ST OR HY 

12-0011-0010-42101-1 Florida Fort Lauderdale 1,000 LOCAL ST OR HY 

12-031-0080-42101-1 Florida Jacksonville 1,000 LOCAL ST OR HY 

12-031-0084-42101-1 Florida Jacksonville 500 LOCAL ST OR HY 

12-099-1004-42101-1 Florida Palm Beach 30,000 MAJ ST OR HY 

12-103-2006-42101-1 Florida Clearwater 23,400 MAJ ST OR HY 

17-031-3103-42101-1 Illinois Schiller Park 47,900 ARTERIAL 

20-209-0021-42101-1 Kansas Kansas City 7,720 MAJ ST OR HY 

24-510-0040-42101-1 Maryland Baltimore 15,300 THRU ST OR HY 

32-031-0022-42101-1 Nevada Reno NR NR 

34-003-0004-42101-1 New Jersey Fort Lee 250,000 ARTERIAL 

36-061-0056-42101-1 New York New York 45,000 MAJ ST OR HY 

39-049-0005-42101-1 Ohio Columbus 36,600 FREEWAY 

39-081-1001-42101-1 Ohio Mingo Junction 2,500 LOCAL ST OR HY 

39-151-0020-42101-1 Ohio Canton 11,000 MAJ ST OR HY 

40-143-0191-42101-1 Oklahoma Tulsa 50,800 FREEWAY 

42-003-0038-42101-1 Pennsylvania Pittsburgh 15,000 MAJ ST OR HY 

42-101-0047-42101-1 Pennsylvania Philadelphia NR NR 

45-019-0046-42101-1 South Carolina Not in a city NR LOCAL ST OR HY 

45-045-0008-42101-1 South Carolina Greenville NR LOCAL ST OR HY 

45-045-0009-42101-1 South Carolina Taylors 9,500 LOCAL ST OR HY 

47-163-0007-42101-1 Tennessee Kingsport NR NR 

48-439-1002-42101-1 Texas Fort Worth 100 LOCAL ST OR HY 

50-007-0014-42101-1 Vermont Burlington NR MAJ ST OR HY 

72-127-0003-42101-1 Puerto Rico San Juan 64,000 MAJ ST OR HY 

“NR” denotes that the value was not reported. 

January 2010 A-11 
Table A-4. Neighborhood scale monitors meeting 75% completeness criteria, 2005-2007. 

Monitor Code State Name City Name Traffic Count Road Type 

01-073-1003-42101-1 Alabama Fairfield 5,000 LOCAL ST OR HY 

01-073-6004-42101-1 Alabama Birmingham NR NR 

02-020-0018-42101-1 Alaska Anchorage NR NR 

02-020-0048-42101-1 Alaska Anchorage 5,000 LOCAL ST OR HY 

02-090-0020-42101-1 Alaska Fairbanks NR NR 

04-013-0019-42101-1 Arizona Phoenix NR LOCAL ST OR HY 

04-013-3002-42101-1 Arizona Phoenix 24,000 ARTERIAL 

04-019-0002-42101-1 Arizona Tucson 37,400 MAJ ST OR HY 

04-019-1011-42101-1 Arizona Tucson 47,000 MAJ ST OR HY 

04-019-1028-42101-1 Arizona Tucson 52,900 MAJ ST OR HY 

06-001-1001-42101-1 California Fremont (Centerville) 500 LOCAL ST OR HY 

06-013-0002-42101-1 California Concord 41,218 MAJ ST OR HY 

06-037-5005-42101-1 California Los Angeles 1,252 LOCAL ST OR HY 

06-053-1003-42101-1 California Salinas 33,193 THRU ST OR HY 

06-065-9001-42101-1 California Lake Elsinore NR NR 

06-067-0007-42101-1 California Sacramento 20,000 THRU ST OR HY 

06-073-0001-42101-1 California Chula Vista 5,000 LOCAL ST OR HY 

06-073-1002-42101-1 California Escondido NR NR 

06-073-2007-42101-1 California Otay Mesa 18,000 LOCAL ST OR HY 

06-083-1025-42101-1 California Capitan NR NR 

06-083-2004-42101-1 California Lompoc NR NR 

06-083-2011-42101-1 California Goleta 5,000 THRU ST OR HY 

06-083-4003-42101-1 California Vandenberg Air Force Base NR NR 

08-01-3001-42101-1 Colorado Welby 500 EXPRESSWAY 

08-067-7001-42101-1 Colorado Not in a city 2,436 LOCAL ST OR HY 

08-069-1004-42101-1 Colorado Fort Collins 5,000 THRU ST OR HY 

08-123-0010-42101-1 Colorado Greeley 6,650 THRU ST OR HY 

11-001-0041-42101-1 District Of Columbia Washington 540 LOCAL ST OR HY 

12-011-2004-42101-1 Florida Pompano Beach 1,000 LOCAL ST OR HY 

12-011-3002-42101-1 Florida Hollywood 1,000 LOCAL ST OR HY 

12-031-0083-42101-1 Florida Jacksonville 10,000 LOCAL ST OR HY 

12-086-0031-42101-1 Florida Miami 62,000 MAJ ST OR HY 

12-086-1019-42101-1 Florida Miami 8,000 MAJ ST OR HY 

12-095-2002-42101-1 Florida Winter Park 7,000 MAJ ST OR HY 

12-103-0018-42101-1 Florida Saint Petersburg 2,000 MAJ ST OR HY 

17-031-4002-42101-1 Illinois Cicero NR NR 

17-163-0010-42101-1 Illinois East Saint Louis 8,900 LOCAL ST OR HY 

18-097-0073-42101-1 Indiana Indianapolis (Remainder) 11,261 THRU ST OR HY 

20-173-0010-42101-1 Kansas Wichita 6,884 LOCAL ST OR HY 

21-111-0046-42101-1 Kentucky Louisville 6,500 THRU ST OR HY 

January 2010 A-12 
Monitor Code State Name City Name Traffic Count Road Type 

22-033-0009-42101-1 Louisiana Baton Rouge 5,000 LOCAL ST OR HY 

25-013-0016-42101-1 Massachusetts Springfield 5,000 LOCAL ST OR HY 

25-017-0007-42101-1 Massachusetts Lowell 15,000 THRU ST OR HY 

25-025-0042-42101-1 Massachusetts Boston 12,785 LOCAL ST OR HY 

27-03-0600-42101-1 Minnesota Fridley 1,400 LOCAL ST OR HY 

27-037-0020-42101-1 Minnesota Rosemount NR NR 

27-037-0423-42101-1 Minnesota Inver Grove Heights (RR name Inver 

Grove) NR NR 

29-510-0086-42101-1 Missouri St. Louis 81,850 MAJ ST OR HY 

30-111-0085-42101-1 Montana Billings 5,700 THRU ST OR HY 

31-055-0035-42101-1 Nebraska Omaha 2,900 LOCAL ST OR HY 

32-003-0538-42101-1 Nevada Las Vegas 20,000 LOCAL ST OR HY 

32-003-0539-42101-1 Nevada Las Vegas 21,000 MAJ ST OR HY 

32-003-0561-42101-1 Nevada Las Vegas 28,400 MAJ ST OR HY 

32-003-1021-42101-1 Nevada Las Vegas NR NR 

32-003-2002-42101-1 Nevada Las Vegas 6,750 THRU ST OR HY 

32-031-0016-42101-1 Nevada Reno 22,700 LOCAL ST OR HY 

32-031-0020-42101-1 Nevada Reno NR NR 

32-031-0025-42101-1 Nevada Reno NR NR 

32-031-1005-42101-1 Nevada Sparks 2,600 LOCAL ST OR HY 

32-031-2009-42101-1 Nevada Lemmon Valley-Golden Valley NR NR 

32-510-0004-42101-1 Nevada Carson City 1 LOCAL ST OR HY 

33-011-0020-42101-1 New Hampshire Manchester 500 LOCAL ST OR HY 

34-003-5001-42101-1 New Jersey Hackensack 15,000 THRU ST OR HY 

34-007-0003-42101-1 New Jersey Camden 45,000 MAJ ST OR HY 

35-001-019-42101-1 New Mexico Albuquerque 1 ARTERIAL 

35-001-0023-42101-1 New Mexico Albuquerque 41,200 MAJ ST OR HY 

35-001-0024-42101-1 New Mexico Albuquerque 15,500 MAJ ST OR HY 

35-001-0028-42101-1 New Mexico Albuquerque 2,0600 THRU ST OR HY 

35-001-1014-42101-1 New Mexico Albuquerque 8,000 THRU ST OR HY 

35-043-9004-42101-1 New Mexico Not in a city 100 LOCAL ST OR HY 

36-063-2008-42101-1 New York Niagara Falls 5,000 LOCAL ST OR HY 

37-119-0041-42101-1 North Carolina Charlotte 16,400 MAJ ST OR HY 

37-119-0041-42101-3 North Carolina Charlotte 16,400 MAJ ST OR HY 

39-035-0070-42101-1 Ohio Cleveland 100 LOCAL ST OR HY 

39-113-0028-42101-1 Ohio Dayton 5,100 LOCAL ST OR HY 

39-153-0020-42101-1 Ohio Akron 200 LOCAL ST OR HY 

40-021-9002-42101-1 Oklahoma Park Hill 10,300 LOCAL ST OR HY 

40-071-9010-42101-1 Oklahoma Not in a city 300 LOCAL ST OR HY 

40-109-0047-42101-1 Oklahoma Oklahoma City 27,000 MAJ ST OR HY 

41-051-0080-42101-1 Oregon Portland 5,000 LOCAL ST OR HY 

42-003-0031-42101-1 Pennsylvania Pittsburgh 4,562 THRU ST OR HY 

42-013-0801-42101-1 Pennsylvania Altoona 100 LOCAL ST OR HY 

January 2010 A-13 
Monitor Code State Name City Name Traffic Count Road Type 

42-017-0012-42101-1 Pennsylvania Bristol 500 LOCAL ST OR HY 

42-021-0011-42101-1 Pennsylvania Johnstown 6,000 LOCAL ST OR HY 

42-049-0003-42101-1 Pennsylvania Erie 1,000 LOCAL ST OR HY 

42-071-0007-42101-1 Pennsylvania Lancaster 2,000 THRU ST OR HY 

42-073-0015-42101-1 Pennsylvania New Castle 4,500 LOCAL ST OR HY 

42-091-0013-42101-1 Pennsylvania Norristown 8,500 MAJ ST OR HY 

42-095-0025-42101-1 Pennsylvania Freemansburg 100 LOCAL ST OR HY 

42-101-0004-42101-1 Pennsylvania Philadelphia 13800 MAJ ST OR HY 

42-101-0027-42101-1 Pennsylvania Philadelphia 46000 MAJ ST OR HY 

42-107-0003-42101-1 Pennsylvania Shenandoah 100 LOCAL ST OR HY 

42-125-0005-42101-1 Pennsylvania Charleroi NR NR 

44-007-1010-42101-1 Rhode Island East Providence 100,000 FREEWAY 

48-061-0006-42101-1 Texas Brownsville 30 LOCAL ST OR HY 

48-113-0069-42101-2 Texas Dallas 1,000 LOCAL ST OR HY 

48-141-0002-42101-1 Texas El Paso 7,270 THRU ST OR HY 

48-141-0029-42101-1 Texas El Paso 2,790 LOCAL ST OR HY 

48-141-0037-42101-1 Texas El Paso 5,000 LOCAL ST OR HY 

48-141-0044-42101-1 Texas El Paso 15,200 ARTERIAL 

48-141-0053-42101-1 Texas El Paso 1,992 FREEWAY 

48-141-0057-42101-1 Texas Socorro 500 LOCAL ST OR HY 

48-141-0058-42101-1 Texas El Paso 1,080 LOCAL ST OR HY 

48-201-0024-42101-1 Texas Not in a city 5,300 MAJ ST OR HY 

48-201-0047-42101-1 Texas Houston 5,860 MAJ ST OR HY 

48-201-1035-42101-1 Texas Houston 13,440 MAJ ST OR HY 

48-201-1039-42101-1 Texas Deer Park 16010 MAJ ST OR HY 

48-439-3011-42101-1 Texas Arlington 10,573 LOCAL ST OR HY 

48-453-0014-42101-1 Texas Austin 3,420 LOCAL ST OR HY 

48-479-0017-42101-1 Texas Laredo 30,380 ARTERIAL 

49-035-0003-42101-1 Utah Not in a city 16,500 THRU ST OR HY 

50-021-0002-42101-1 Vermont Rutland NR NR 

51-059-0005-42101-1 Virginia Not in a city 25 LOCAL ST OR HY 

51-650-0004-42101-2 Virginia Hampton 2,000 LOCAL ST OR HY 

51-760-0024-42101-1 Virginia Richmond 7,591 THRU ST OR HY 

51-770-0015-42101-1 Virginia Roanoke NR NR 

54-009-0011-42101-1 West Virginia Weirton NR NR 

54-029-0009-42101-1 West Virginia Weirton NR NR 

54-029-1004-42101-1 West Virginia Weirton 50 LOCAL ST OR HY 

“NR” denotes that the value was not reported. 

January 2010 A-14 
Table A-5. Urban scale monitors meeting 75% completeness criteria, 2005-2007. 

Monitor Code State Name City Name Traffic Count Road Type 

06-059-0007-42101-1 California Anaheim 1,000 LOCAL ST OR HY 

13-089-0002-42101-1 Georgia Decatur 9,250 LOCAL ST OR HY 

13-223-0003-42101-1 Georgia Not in a city 6 LOCAL ST OR HY 

25-027-0023-42101-1 Massachusetts Worcester NR LOCAL ST OR HY 

34-007-1001-42101-1 New Jersey Not in a city 4,000 THRU ST OR HY 

42-003-0010-42101-1 Pennsylvania Pittsburgh 1,000 MAJ ST OR HY 

42-007-0014-42101-1 Pennsylvania Beaver Falls NR NR 

42-129-0008-42101-1 Pennsylvania Greensburg 100 THRU ST OR HY 

42-133-0008-42101-1 Pennsylvania York 8,400 THRU ST OR HY 

48-141-0055-42101-1 Texas El Paso 2450 LOCAL ST OR HY 

51-059-0030-42101-1 Virginia Franconia 200 LOCAL ST OR HY 

“NR” denotes that the value was not reported. 

Table A-6. Regional scale monitors meeting 75% completeness criteria, 2005-2007. 

Monitor Code State Name City Name Traffic Count Road Type 

23-009-0103-42101-1 Maine Not in a city 3,500 LOCAL ST OR HY 

35-001-0029-42101-1 New Mexico South Valley 8,800 LOCAL ST OR HY 

“NR” denotes that the value was not reported. 

January 2010 A-15 
Table A-7. Monitors meeting 75% completeness criteria, 2005-2007 with no scale delared. 

Monitor Code State Name City Name Traffic Count Road Type 

04-013-9997-42101-1 Arizona Phoenix 250 LOCAL ST OR HY 

06-001-0007-42101-1 California Livermore 2,400 LOCAL ST OR HY 

06-007-0002-42101-1 California Chico 44,000 LOCAL ST OR HY 

06-013-1002-42101-1 California Bethel Island NR NR 

06-013-1004-42101-1 California San Pablo NR THRU ST OR HY 

06-013-3001-42101-1 California Pittsburg 9,600 THRU ST OR HY 

06-019-0007-42101-1 California Fresno 500 LOCAL ST OR HY 

06-019-0008-42101-1 California Fresno 20,000 MAJ ST OR HY 

06-019-0242-42101-1 California Fresno 500 LOCAL ST OR HY 

06-019-5001-42101-1 California Clovis 16,461 THRU ST OR HY 

06-025-0005-42101-1 California Calexico 7,000 LOCAL ST OR HY 

06-025-0006-42101-1 California Calexico 10 THRU ST OR HY 

06-025-1003-42101-1 California El Centro NR NR 

06-037-0002-42101-1 California Azusa 600 THRU ST OR HY 

06-037-0113-42101-1 California West Los Angeles NR NR 

06-037-1002-42101-1 California Burbank 2,400 LOCAL ST OR HY 

06-037-1103-42101-1 California Los Angeles 9,000 THRU ST OR HY 

06-037-1201-42101-1 California Reseda NR NR 

06-037-1701-42101-1 California Pomona NR NR 

06-037-2005-42101-1 California Pasadena 18,000 THRU ST OR HY 

06-037-4002-42101-1 California Long Beach 24,000 LOCAL ST OR HY 

06-037-6012-42101-1 California Santa Clarita 4,395 LOCAL ST OR HY 

06-041-0001-42101-1 California San Rafael 15,000 MAJ ST OR HY 

06-045-0008-42101-1 California Ukiah 12,000 LOCAL ST OR HY 

06-045-0009-42101-1 California Willits 18,000 MAJ ST OR HY 

06-055-0003-42101-1 California Napa NR NR 

06-059-2022-42101-1 California Mission Viejo 42,400 MAJ ST OR HY 

06-059-5001-42101-1 California La Habra NR NR 

06-065-5001-42101-1 California Palm Springs NR NR 

06-065-8001-42101-1 California Rubidoux (West Riverside) 18,000 THRU ST OR HY 

06-067-0002-42101-1 California North Highlands NR NR 

06-067-0006-42101-1 California Sacramento 10,000 LOCAL ST OR HY 

06-067-0013-42101-1 California Sacramento 100 LOCAL ST OR HY 

06-071-0001-42101-1 California Barstow NR NR 

06-071-0306-42101-1 California Victorville 454 LOCAL ST OR HY 

06-071-1004-42101-1 California Upland 15,000 THRU ST OR HY 

06-075-0005-42101-1 California San Francisco 240,700 FREEWAY 

06-077-1002-42101-1 California Stockton 6,000 LOCAL ST OR HY 

06-081-1001-42101-1 California Redwood City 1,000 LOCAL ST OR HY 

06-087-0003-42101-1 California Davenport NR NR 

January 2010 A-16 
Monitor Code State Name City Name Traffic Count Road Type 

06-095-0004-42101-1 California Vallejo 9,350 THRU ST OR HY 

06-097-0003-42101-1 California Santa Rosa 2,608 THRU ST OR HY 

06-099-0005-42101-1 California Modesto NR NR 

06-099-0006-42101-1 California Turlock 500 LOCAL ST OR HY 

09-003-1003-42101-1 Connecticut East Hartford 800 LOCAL ST OR HY 

10-003-1008-42101-1 Delaware Not in a city NR NR 

10-003-2004-42101-1 Delaware Wilmington 28,046 MAJ ST OR HY 

15-003-0010-42101-1 Hawaii Ewa Beach NR NR 

18-063-0002-42101-1 Indiana Pittsboro 500 LOCAL ST OR HY 

25-025-0002-42101-1 Massachusetts Boston 35,000 MAJ ST OR HY 

29-077-0032-42101-1 Missouri Springfield 1,000 LOCAL ST OR HY 

29-189-0004-42101-1 Missouri Sunset Hills 33,300 MAJ ST OR HY 

30-013-0001-42101-1 Montana Great Falls 26,155 MAJ ST OR HY 

31-109-0018-42101-1 Nebraska Lincoln NR NR 

34-023-2003-42101-1 New Jersey Perth Amboy 14,000 LOCAL ST OR HY 

34-025-2001-42101-1 New Jersey Freehold NR NR 

34-027-0003-42101-1 New Jersey Morristown NR NR 

36-001-0012-42101-1 New York Albany 12,000 MAJ ST OR HY 

36-029-0005-42101-1 New York Buffalo 26,000 ARTERIAL 

36-055-1007-42101-1 New York Rochester NR NR 

36-067-0017-42101-1 New York Syracuse NR NR 

36-081-0124-42101-1 New York New York 10,000 EXPRESSWAY 

36-093-0003-42101-1 New York Schenectady 37,000 EXPRESSWAY 

36-103-0009-42101-2 New York Holtsville 10,000 THRU ST OR HY 

48-479-0016-42101-1 Texas Laredo 16,180 MAJ ST OR HY 

49-057-0006-42101-1 Utah Ogden 38,000 ARTERIAL 

51-013-0020-42101-1 Virginia Not in a city 6,000 MAJ ST OR HY 

51-059-1005-42101-1 Virginia Annandale 24,000 MAJ ST OR HY 

51-059-5001-42101-1 Virginia McLean 36,845 MAJ ST OR HY 

51-510-0009-42101-1 Virginia Alexandria 3,974 LOCAL ST OR HY 

56-039-1012-42101-1 Wyoming Not in a city NR NR 

“NR” denotes that the value was not reported. 

January 2010 A-17 
Table A-8. Numbers of high LOD and trace-level monitors in each state that met completeness 

criteria for 2005-2007. 

State Number of high LOD monitors Number of trace-level monitors 

Alabama 2 0 

Alaska 4 0 

Arizona 9 0 

Arkansas 0 0 

California 65 0 

Colorado 9 0 

Connecticut 2 0 

Delaware 2 0 

District of Columbia 2 0 

Florida 18 0 

Georgia 3 0 

Hawaii 1 0 

Idaho 0 0 

Illinois 8 0 

Indiana 6 0 

Iowa 0 0 

Kansas 2 0 

Kentucky 2 0 

Louisiana 0 1 

Maine 0 1 

Maryland 1 0 

Massachusetts 4 1 

Michigan 0 0 

Minnesota 7 0 

Mississippi 0 0 

Missouri 3 0 

Montana 4 0 

Nebraska 2 0 

Nevada 12 0 

New Hampshire 2 0 

New Jersey 9 0 

New Mexico 7 0 

New York 9 0 

North Carolina 2 1 

North Dakota 0 0 

Ohio 14 0 

Oklahoma 4 0 

Oregon 3 1 

Pennsylvania 19 0 

Puerto Rico 1 0 

January 2010 A-18 
State Number of high LOD monitors Number of trace-level monitors 

Rhode Island 1 0 

South Carolina 3 1 

South Dakota 0 0 

Tennessee 3 0 

Texas 19 2 

Utah 2 0 

Vermont 2 0 

Virginia 9 0 

Washington 2 0 

West Virginia 3 0 

Wisconsin 0 0 

Wyoming 1 0 

January 2010 A-19 
Figure A-8. Map of CO monitor locations with respect to population density in the Anchorage 

CBSA, total population. 

Figure A-9. Map of CO monitor locations with respect to population density in the Anchorage 

CBSA, ages 65 yr and older. 

January 2010 A-20 
Figure A-10. Map of CO monitor locations with respect to population density in the Atlanta 

CSA, total population. 

Figure A-11. Map of CO monitor locations with respect to population density in the Atlanta 

CSA, ages 65 yr and older. 

January 2010 A-21 
Figure A-12. Map of CO monitor locations with respect to population density in the Boston 

CSA, total population. 

Figure A-13. Map of CO monitor locations with respect to population density in the Boston 

CSA, ages 65 yr and older. 

January 2010 A-22 
Figure A-14. Map of CO monitor locations with respect to population density in the Houston 

CSA, total population. 

Figure A-15. Map of CO monitor locations with respect to population density in the Houston 

CSA, ages 65 yr and older. 

January 2010 A-23 
Figure A-16. Map of CO monitor locations with respect to population density in the New York 

City CSA, total population. 

Figure A-17. Map of CO monitor locations with respect to population density in the New York 

City CSA, ages 65 yr and older. 

January 2010 A-24 
Figure A-18. Map of CO monitor locations with respect to population density in the Phoenix 

CSA, total population. 

Figure A-19. Map of CO monitor locations with respect to population density in the Phoenix 

CSA, ages 65 yr and older. 

January 2010 A-25 
Figure A-20. Map of CO monitor locations with respect to population density in the Pittsburgh 

CSA, total population. 

Figure A-21. Map of CO monitor locations with respect to population density in the Pittsburgh 

CSA, ages 65 yr and older. 

January 2010 A-26 
Figure A-22. Map of CO monitor locations with respect to population density in the Seattle 

CSA, total population. 

Figure A-23. Map of CO monitor locations with respect to population density in the Seattle 

CSA, ages 65 yr and older. 

January 2010 A-27 
Figure A-24. Map of CO monitor locations with respect to population density in the St. Louis 

CSA, total population. 

Figure A-25. Map of CO monitor locations with respect to population density in the St. Louis 

CSA, ages 65 yr and older. 

January 2010 A-28 
Figure A-26. Map of CO monitor locations with AQS Site IDs for Anchorage, AK. 

January 2010 A-29 
Table A-9. Table of inter-sampler comparison statistics, including Pearson r, P90 (ppm), COD, and d 

(km), as defined in the text, for each pair of hourly CO monitors reporting to AQS in 

Anchorage, AK. 

 Neighborhood 

 A B 

A 1.00 0.73 

 0.0 1.1 

 0.00 0.32 

 0 9.0 

B Legend 1.00 

 r 0.0 

 P90 0.00 

Neighborhood 

 COD 0 

 d 

 

January 2010 A-30 
A B 

Site ID 02-020-0018 02-020-0048 

Mean 1.04 1.10 

SD 0.94 1.04 

Obs 12969 12703 

Figure A-27. Box plots illustrating the seasonal distribution of hourly CO concentrations in 

Anchorage, AK. Note: 1 = winter, 2 = spring, 3 = summer, and 4 = fall on the 

x-axis. 

January 2010 A-31 
Figure A-28. Map of CO monitor locations with AQS Site IDs for Atlanta, GA. 

January 2010 A-32 
Table A-10. Table of inter-sampler comparison statistics, including Pearson r, P90 (ppm), COD, and d 

(km), as defined in the text, for each pair of hourly CO monitors reporting to AQS in 

Atlanta, GA. 

 Micro Urban 

 A B C 

A 1.00 0.60 0.10 

 0.0 0.5 0.7 

Micro 

 0.00 0.27 0.38 

 0 22.5 61.7 

B 1.00 0.12 

 0.0 0.7 

 0.00 0.37 

 0 74.7 

C Legend 1.00 

 r 0.0 

 P90 0.00 

Urban 

 COD 0 

d 

 

January 2010 A-33 
1 

A B C 

Site ID 13-121- 0099 

13-089- 0002 13-223- 0003 

Mean 0.58 0.53 0.30 

SD 0.30 0.35 0.13 

Obs 25440 25531 25712 concentration (ppm)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

1.7

season

1234 1234 1234

Figure A-29. Box plots illustrating the seasonal distribution of hourly CO concentrations in 

Atlanta, GA. Note: 1 = winter, 2 = spring, 3 = summer, and 4 = fall on the x-axis. 

January 2010 A-34 
Figure A-30. Map of CO monitor locations with AQS Site IDs for Boston, MA. 

January 2010 A-35 
Table A-11. Table of inter-sampler comparison statistics, including Pearson r, P90 (ppm), COD, and d 

(km), as defined in the text, for each pair of hourly CO monitors reporting to AQS in 

Boston, MA. 

 Micro Neighborhood Urban Null 

 A B C D E F G 

A 1.00 0.50 0.38 0.49 0.43 0.46 0.35 

 0.0 0.6 0.6 0.5 0.6 0.5 0.7 

Micro 

 0.00 0.44 0.46 0.30 0.39 0.25 0.60 

 0 18.3 57.5 26.1 102.6 61.5 55.1 

B 1.00 0.50 0.41 0.40 0.49 0.35 

 0.0 0.4 0.4 0.4 0.5 0.4 

 0.00 0.48 0.41 0.40 0.42 0.58 

 0 39.7 41.3 89.1 57.9 37.2 

C 1.00 0.26 0.36 0.37 0.52 

 0.0 0.5 0.4 0.5 0.4 

 0.00 0.45 0.47 0.45 0.56 

 0 80.7 58.7 58.9 2.5 

D 1.00 0.29 0.40 0.27 

 0.0 0.4 0.4 0.5 

 0.00 0.37 0.28 0.58 

 Legend 0 128.6 85.8 78.2 

E r 1.00 0.34 0.34 

 P90 0.0 0.5 0.4 

 COD 0.00 0.39 0.55 

Neighborhood 

 d 0 58.9 60.2 

F 1.00 0.34 

 0.0 0.6 

Urban 

 0.00 0.59 

 0 58.0 

G 1.00 

 0.0 

 0.00 

Null 

 0 

January 2010 A-36 
A B C D E F G 

Site ID 33-011- 1009 

25-017- 0007 25-025- 0042 33-011- 0020 44-007- 1010 25-027- 0023 25-025- 0002 

Mean 0.60 0.33 0.36 0.45 0.34 0.53 0.26 

SD 0.37 0.22 0.26 0.27 0.22 0.23 0.24 

Obs 25869 24362 24260 25197 23707 24446 24134 concentration (ppm)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

1.9

season

1234 1234 1234 1234 1234 1234 1234

Figure A-31. Box plots illustrating the seasonal distribution of hourly CO concentrations in 

Boston, MA. Note: 1 = winter, 2 = spring, 3 = summer, and 4 = fall on the x-axis. 

 

January 2010 A-37 
Figure A-32. Map of CO monitor locations with AQS Site IDs for Houston, TX. 

January 2010 A-38 
Table A-12. Table of inter-sampler comparison statistics, including Pearson r, P90 (ppm), COD, and d 

(km), as defined in the text, for each pair of hourly CO monitors reporting to AQS in 

Houston, TX. 

 Micro Neighborhood 

 A B C D E 

 1.00 0.45 0.56 0.53 0.43 

A 0.0 0.4 0.4 0.5 0.4 

 0.00 0.47 0.47 0.74 0.47 

Micro 

 0.0 16.7 16.3 9.3 23.5 

 1.00 0.72 0.56 0.68 

B 0.0 0.3 0.5 0.3 

 0.00 0.29 0.73 0.24 

 0.0 17.5 19.8 32.2 

 1.00 0.65 0.63 

C 0.0 0.5 0.4 

 0.00 0.73 0.29 

 0.0 25.2 39.7 

 1.00 0.57 

D 0.0 0.4 

 0.00 0.72 

 Legend 0.0 14.5 

 r 1.00 

E P90 0.0 

 COD 0.00 

Neighborhood 

 d 0.0 

January 2010 A-39 
1 

A B C D E 

Site ID 48-201- 0075 

48-201- 0024 48-201- 0047 48-201- 1035 48-201- 1039 

Mean 0.35 0.42 0.39 0.14 0.33 

SD 0.26 0.27 0.33 0.22 0.16 

Obs 24922 23997 25241 25285 24480 concentration (ppm)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

season

1234 1234 1234 1234 1234

Figure A-33. Box plots illustrating the seasonal distribution of hourly CO concentrations in 

Houston, TX. Note: 1 = winter, 2 = spring, 3 = summer, and 4 = fall on the x-axis. 

 

January 2010 A-40 
Figure A-34. Map of CO monitor locations with AQS Site IDs for New York City, NY. 

January 2010 A-41 
Table A-13. Table of inter-sampler comparison statistics, including Pearson r, P90 (ppm), COD, and d 

(km), as defined in the text, for each pair of hourly CO monitors reporting to AQS in New 

York City, NY. 

 Micro Middle Neighborhood Null 

 A B C D E F G H I 

A 1.00 0.65 0.52 0.64 0.54 0.32 0.48 0.43 0.31 

 0.0 0.7 0.7 0.8 0.9 0.9 0.9 0.9 1.3 

Micro 

 0.00 0.28 0.24 0.29 0.35 0.34 0.34 0.35 0.81 

 0 15.9 8.9 16.8 29.9 55.0 35.7 20.5 85.5 

B 1.00 0.56 0.58 0.55 0.40 0.56 0.41 0.30 

 0.0 0.4 0.4 0.4 0.4 0.4 0.5 0.8 

 0.00 0.23 0.22 0.25 0.25 0.24 0.28 0.75 

 0 10.5 7.0 45.8 70.6 43.7 17.8 76.5 

C 1.00 0.54 0.41 0.33 0.41 0.46 0.29 

 0.0 0.4 0.4 0.4 0.4 0.4 0.7 

 0.00 0.23 0.28 0.25 0.26 0.26 0.77 

Middle 0 15.0 37.5 61.0 43.6 12.3 76.8 

D 1.00 0.55 0.35 0.54 0.59 0.49 

 0.0 0.4 0.5 0.4 0.4 0.7 

 0.00 0.23 0.26 0.23 0.23 0.74 

Neighborhood 

 0 45.4 71.5 38.1 24.5 82.9 

E 1.00 0.50 0.57 0.46 0.33 

 0.0 0.4 0.4 0.4 0.7 

 0.00 0.24 0.23 0.27 0.72 

 0 27.5 36.7 45.1 107.8 

F 1.00 0.47 0.33 0.32 

 0.0 0.4 0.4 0.6 

 0.00 0.23 0.27 0.73 

 0 61.9 65.0 120.3 

G Legend 1.00 0.34 0.31 

 r 0.0 0.4 0.7 

 P90 0.00 0.27 0.72 

 COD 0 55.8 119.7 

H d 1.00 0.43 

 0.0 0.6 

 0.00 0.73 

 0 65.1 

I 1.00 

 0.0

 0.00 

Null 0

 

January 2010 A-42 
A B C D E F G H I 

Site ID 34-017- 1002 

34-003- 0004 36-061- 0056 34-003- 5001 34-023- 2003 34-025- 2001 34-027- 0003 36-081- 0124 36-103- 0009 

Mean 0.85 0.55 0.62 0.52 0.48 0.50 0.49 0.47 0.12 

SD 0.43 0.27 0.21 0.30 0.27 0.24 0.25 0.23 0.17 

Obs 25646 23113 25547 25150 25028 25727 25691 25022 25749 concentration (ppm)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

1.9

2.0

season

1234 1234 1234 1234 1234 1234 1234 1234 1234

Figure A-35. Box plots illustrating the seasonal distribution of hourly CO concentrations in 

New York City, NY. Note: 1 = winter, 2 = spring, 3 = summer, and 4 = fall on the xaxis. 

January 2010 A-43 
Figure A-36. Map of CO monitor locations with AQS Site IDs for Phoenix, AZ. 

January 2010 A-44 
Table A-14. Table of inter-sampler comparison statistics, including Pearson r, P90 (ppm), COD, and d 

(km), as defined in the text, for each pair of hourly CO monitors reporting to AQS in 

Phoenix, AZ. 

 Micro Middle Neighborhood Null 

 A B C D E 

A 1.00 0.86 0.89 0.80 0.84 

 0.0 0.8 0.7 1.1 0.9 

Micro 

 0.00 0.39 0.37 0.43 0.37 

 0.0 3.9 1.6 8.9 3.5 

B 1.00 0.88 0.81 0.83 

 0.0 0.6 0.7 0.6 

Middle 

 0.00 0.34 0.41 0.33 

 0.0 3.4 6.6 5.2 

C 1.00 0.81 0.89 

 0.0 0.9 0.7 

 0.00 0.38 0.24 

 Legend 0.0 9.4 4.9 

D r 1.00 0.85 

 P90 0.0 0.6 

 COD 0.00 0.36 

Neighborhood 

 d 0.0 6.8 

E 1.00 

 0.0 

 0.00 

Null 

 0.0 

January 2010 A-45 
A B C D E 

Site ID 04-013- 0016 

04-013- 3010 04-013- 0019 04-013- 3002 04-013- 9997 

Mean 0.93 0.76 0.84 0.58 0.79 

SD 0.95 0.72 0.88 0.64 0.64 

Obs 25382 25414 25589 25657 25435 concentration (ppm)

0

1

2

3

4

5

season

1234 1234 1234 1234 1234

Figure A-37. Box plots illustrating the seasonal distribution of hourly CO concentrations in 

Phoenix, AZ. Note: 1 = winter, 2 = spring, 3 = summer, and 4 = fall on the x-axis. 

January 2010 A-46 
Figure A-38. Map of CO monitor locations with AQS Site IDs for Pittsburgh, PA. 

January 2010 A-47 
Table A-15. Table of inter-sampler comparison statistics, including Pearson r, P90 (ppm), COD, and d 

(km), as defined in the text, for each pair of hourly CO monitors reporting to AQS in 

Pittsburgh, PA. 

 Middle Neighborhood Urban 

 A B C D E F G 

A 1.00 0.25 0.39 0.73 0.20 0.30 0.43 

 0.0 0.7 0.6 0.4 0.7 0.8 0.6 

Middle 

 0.00 0.65 0.51 0.39 0.56 0.88 0.68 

 0 33.3 68.2 0.7 43.4 44.1 1.8 

B 1.00 0.26 0.29 0.09 0.09 0.42 

 0.0 0.5 0.5 0.6 0.5 0.5 

 0.00 0.68 0.62 0.69 0.90 0.73 

 0 101.0 33.6 75.0 37.8 34.4 

C 1.00 0.42 0.16 0.21 0.11 

 0.0 0.4 0.6 0.6 0.6 

 0.00 0.51 0.57 0.87 0.72 

 0 68.0 27.5 104.1 66.8 

D 1.00 0.30 0.35 0.52 

 0.0 0.5 0.5 0.5 

 0.00 0.54 0.86 0.69 

Neighborhood 

 0 43.4 43.7 2.2 

E 1.00 0.02 0.05 

 0.0 0.7 0.7 

 0.00 0.87 0.74 

 0 84.1 41.9 

F 1.00 0.18 

 0.0 0.7 

 0.00 0.88 

 Legend 0 45.8 

G r 1.00 

 P90 0.0 

 COD 0.00 

Urban 

 d 0 

January 2010 A-48 
A B C D E F G 

SiteID 42-003- 0038 

42-125- 0005 42-073- 0015 42-003- 0031 42-007- 0014 42-129- 0008 42-003- 0010 

Mean 0.47 0.21 0.32 0.32 0.28 0.07 0.28 

SD 0.33 0.23 0.26 0.26 0.27 0.15 0.32 

Obs 25818 25319 25745 25936 25500 25785 25655 concentration (ppm)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

season

1234 1234 1234 1234 1234 1234 1234

Figure A-39. Box plots illustrating the seasonal distribution of hourly CO concentrations in 

Pittsburgh, PA. Note: 1 = winter, 2 = spring, 3 = summer, and 4 = fall on the x-axis. 

January 2010 A-49 
Figure A-40. Map of CO monitor locations with AQS Site IDs for Seattle, WA. 

January 2010 A-50 
A 

Site ID 53-033-0019 

Mean 0.75 

SD 0.49 

Obs 25818 

Figure A-41. Box plots illustrating the seasonal distribution of hourly CO concentrations in 

Seattle, WA. Note: 1 = winter, 2 = spring, 3 = summer, and 4 = fall on the x-axis. 

January 2010 A-51 
Figure A-42. Map of CO monitor locations with AQS Site IDs for St. Louis, MO. 

January 2010 A-52 
Table A-16. Table of inter-sampler comparison statistics, including Pearson r, P90 (ppm), COD, and d 

(km), as defined in the text, for each pair of hourly CO monitors reporting to AQS in St. 

Louis, MO. 

 Neighborhood Null 

 A B C 

A 1.00 0.60 0.19 

 0.0 0.3 0.5 

 0.00 0.24 0.40 

 0 9.5 21.2 

B 1.00 0.19 

 0.0 0.5 

 0.00 0.42 

Neighborhood 

 0 19.8 

C Legend 1.00 

 r 0.0 

 P90 0.00 

Null 

 COD 0 

 d 

 

January 2010 A-53 
A B C 

Site ID 17-163- 0010 

29-510- 0086 29-189-0004

Mean 0.44 0.42 0.43 

SD 0.25 0.29 0.25 

Obs 25325 25938 25879 concentration (ppm)

-0.1

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

season

1234 1234 1234

Figure A-43. Box plots illustrating the seasonal distribution of hourly CO concentrations in St. 

Louis, MO. Note: 1 = winter, 2 = spring, 3 = summer, and 4 = fall on the x-axis. 

January 2010 A-54 
Table A-17. Comparison of distributional data at different monitoring scales for hourly, 1-h daily 

max, 24-h avg, and 8-h daily max data for Atlanta, GA. 

PERCENTILES 

Time Scale N Mean Min 1 5 10 25 50 75 90 95 99 max 

ALL HOURLY 

Microscale 25,440 0.6 0.0 0.2 0.2 0.3 0.4 0.4 0.5 0.7 0.7 1.0 1.2 

Urban Scale 51,243 0.4 0.0 0.0 0.1 0.2 0.3 0.3 0.3 0.4 0.5 0.7 1.0 

1-H DAILY MAX 

Microscale 1,075 1.0 0.2 0.3 0.4 0.6 0.7 0.8 1.0 1.2 1.2 1.6 1.9 

Urban Scale 2,154 0.7 0.0 0.2 0.2 0.3 0.3 0.4 0.5 0.8 0.9 1.3 1.5 

1-H DAILY AVG 

Microscale 1,075 0.6 0.2 0.2 0.3 0.3 0.4 0.5 0.5 0.6 0.7 0.8 1.0 

Urban Scale 2,154 0.4 0.0 0.1 0.2 0.2 0.3 0.3 0.4 0.5 0.5 0.7 0.9 

8-H DAILY MAX 

Microscale 1,075 0.8 0.3 0.3 0.3 0.4 0.5 0.6 0.7 0.9 0.9 1.2 1.3 

Urban Scale 2,154 0.5 0.0 0.1 0.2 0.3 0.3 0.3 0.4 0.6 0.7 1.0 1.3 

 

Table A-18. Comparison of distributional data at different monitoring scales for hourly, 1-h daily 

max, 24-h avg, and 8-h daily max data for Boston, MA. 

PERCENTILES 

Time Scale N Mean Min 1 5 10 25 50 75 90 95 99 max 

ALL HOURLY 

Microscale 25,869 0.6 0.0 0.1 0.2 0.3 0.4 0.4 0.5 0.7 0.7 1.0 1.2 

Neighborhood Scale 97,526 0.4 0.0 0.0 0.0 0.1 0.2 0.3 0.3 0.4 0.5 0.6 0.8 

Urban Scale 24,446 0.5 0.0 0.1 0.3 0.3 0.4 0.4 0.5 0.6 0.6 0.8 0.9 

1-H DAILY MAX 

Microscale 1,080 1.2 0.2 0.4 0.5 0.6 0.7 0.8 0.9 1.2 1.4 2.0 2.5 

Neighborhood Scale 4,212 0.6 0.0 0.1 0.2 0.3 0.4 0.4 0.5 0.7 0.7 1.1 1.4 

Urban Scale 1,086 0.8 0.0 0.3 0.4 0.5 0.6 0.6 0.8 0.9 1.0 1.2 1.4 

1-H DAILY AVG 

Microscale 1,080 0.6 0.1 0.2 0.3 0.3 0.4 0.5 0.6 0.7 0.7 0.9 1.1 

Neighborhood Scale 4,212 0.4 0.0 0.0 0.1 0.1 0.2 0.3 0.4 0.4 0.5 0.6 0.7 

Urban Scale 1,086 0.5 0.0 0.1 0.3 0.4 0.4 0.5 0.5 0.6 0.6 0.7 0.8 

8-H DAILY MAX 

Microscale 1,080 0.8 0.3 0.3 0.3 0.4 0.6 0.6 0.7 0.9 1.0 1.4 1.7 

Neighborhood Scale 4,212 0.5 0.3 0.3 0.3 0.3 0.3 0.3 0.4 0.6 0.6 0.8 1.0 

Urban Scale 1,086 0.7 0.3 0.3 0.3 0.3 0.5 0.5 0.6 0.8 0.8 1.0 1.1 

 

January 2010 A-55 
Table A-19. Comparison of distributional data at different monitoring scales for hourly, 1-h daily 

max, 24-h avg, and 8-h daily max data for Denver, CO. 

PERCENTILES 

Time Scale N Mean Min 1 5 10 25 50 75 90 95 99 max 

ALL HOURLY 

Microscale 77,070 0.5 0.0 0.0 0.1 0.1 0.3 0.3 0.4 0.6 0.7 1.0 1.3 

Neighborhood Scale 51,968 0.5 0.0 0.0 0.1 0.2 0.3 0.3 0.4 0.6 0.6 1.0 1.3 

1-H DAILY MAX 

Microscale 3,190 1.2 0.1 0.3 0.4 0.5 0.7 0.8 1.0 1.4 1.5 2.2 2.7 

Neighborhood Scale 2,173 1.1 0.1 0.2 0.3 0.4 0.6 0.6 0.9 1.3 1.5 2.1 2.6 

1-H DAILY AVG 

Microscale 3,190 0.5 0.0 0.1 0.2 0.2 0.3 0.4 0.5 0.6 0.6 0.9 1.0 

Neighborhood Scale 2,173 0.5 0.0 0.1 0.2 0.3 0.3 0.4 0.5 0.6 0.6 0.9 1.1 

8-H DAILY MAX 

Microscale 3,190 0.8 0.3 0.3 0.3 0.4 0.5 0.5 0.7 0.9 1.0 1.4 1.8 

Neighborhood Scale 2,173 0.8 0.3 0.3 0.3 0.3 0.4 0.5 0.7 0.9 1.0 1.5 1.8 

 

Table A-20. Comparison of distributional data at different monitoring scales for hourly, 1-h daily 

max, 24-h avg, and 8-h daily max data for Houston, TX. 

PERCENTILES 

Time Scale N Mean Min 1 5 10 25 50 75 90 95 99 max 

ALL HOURLY 

Microscale 24,922 0.3 0.0 0.0 0.0 0.0 0.2 0.2 0.3 0.4 0.5 0.6 0.8 

Neighborhood Scale 99,003 0.3 0.0 0.0 0.0 0.0 0.2 0.2 0.3 0.4 0.4 0.6 0.8 

1-H DAILY MAX 

Microscale 1,043 0.7 0.0 0.0 0.2 0.3 0.4 0.5 0.6 0.8 0.9 1.2 1.4 

Neighborhood Scale 4,145 0.7 0.0 0.0 0.1 0.2 0.4 0.4 0.5 0.8 0.8 1.3 1.7 

1-H DAILY AVG 

Microscale 1,043 0.3 0.0 0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.5 0.6 0.6 

Neighborhood Scale 4,145 0.3 0.0 0.0 0.0 0.1 0.2 0.2 0.3 0.4 0.4 0.5 0.6 

8-H DAILY MAX 

Microscale 1,043 0.5 0.3 0.3 0.3 0.3 0.3 0.3 0.4 0.6 0.6 0.8 1.0 

Neighborhood Scale 4,145 0.5 0.3 0.3 0.3 0.3 0.3 0.3 0.4 0.5 0.6 0.9 1.1 

 

January 2010 A-56 
Table A-21. Comparison of distributional data at different monitoring scales for hourly, 1-h daily 

max, 24-h avg, and 8-h daily max data for Los Angeles, CA. 

PERCENTILES 

Time Scale N Mean Min 1 5 10 25 50 75 90 95 99 max 

ALL HOURLY 

Microscale 24,885 0.7 0.0 0.2 0.3 0.3 0.4 0.4 0.5 0.7 0.8 1.2 1.6 

Middle Scale 98,564 0.5 0.0 0.0 0.0 0.0 0.1 0.2 0.4 0.6 0.7 1.1 1.6 

Neighborhood Scale 49,757 0.3 0.0 0.0 0.0 0.0 0.1 0.1 0.2 0.3 0.3 0.6 0.8 

Urban Scale 24,264 0.4 0.0 0.0 0.1 0.1 0.1 0.2 0.3 0.4 0.5 1.0 1.4 

1-H DAILY MAX 

Microscale 1,080 1.3 0.2 0.4 0.5 0.6 0.8 0.8 1.1 1.6 1.7 2.3 2.7 

Middle Scale 4,299 1.2 0.0 0.1 0.1 0.2 0.5 0.6 0.9 1.3 1.5 2.5 3.7 

Neighborhood Scale 2,164 0.7 0.0 0.0 0.0 0.1 0.3 0.3 0.5 0.8 0.9 1.3 1.7 

Urban Scale 1,053 1.0 0.0 0.1 0.2 0.3 0.4 0.4 0.7 1.3 1.5 2.2 2.6 

1-H DAILY AVG 

Microscale 1,080 0.7 0.2 0.3 0.3 0.4 0.5 0.5 0.6 0.7 0.8 1.1 1.2 

Middle Scale 4,299 0.5 0.0 0.0 0.0 0.1 0.2 0.2 0.4 0.6 0.7 1.1 1.5 

Neighborhood Scale 2,164 0.3 0.0 0.0 0.0 0.0 0.1 0.2 0.2 0.3 0.4 0.5 0.6 

Urban Scale 1,053 0.4 0.0 0.0 0.1 0.1 0.2 0.2 0.3 0.5 0.6 0.9 1.1 

8-H DAILY MAX 

Microscale 1,080 0.9 0.3 0.3 0.4 0.4 0.6 0.6 0.8 1.1 1.2 1.6 1.8 

Middle Scale 4,299 0.8 0.3 0.3 0.3 0.3 0.3 0.3 0.6 0.9 1.0 1.8 2.4 

Neighborhood Scale 2,164 0.5 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.5 0.6 0.9 1.2 

Urban Scale 1,053 0.7 0.3 0.3 0.3 0.3 0.3 0.3 0.5 0.8 0.9 1.5 1.8 

 

January 2010 A-57 
Table A-22. Comparison of distributional data at different monitoring scales for hourly, 1-h daily 

max, 24-h avg, and 8-h daily max data for New York City, NY. 

PERCENTILES 

Time Scale N Mean Min 1 5 10 25 50 75 90 95 99 max 

ALL HOURLY 

Microscale 25,646 0.8 0.0 0.2 0.3 0.4 0.5 0.6 0.8 1.0 1.1 1.4 1.6 

Middle Scale 48,660 0.6 0.0 0.1 0.3 0.3 0.4 0.5 0.6 0.7 0.7 0.9 1.0 

Neighborhood Scale 25,150 0.5 0.0 0.2 0.2 0.3 0.3 0.4 0.4 0.6 0.6 0.9 1.1 

1-H DAILY MAX 

Microscale 1,077 1.4 0.3 0.4 0.6 0.8 1.0 1.1 1.4 1.7 1.8 2.1 2.4 

Middle Scale 2,053 0.9 0.2 0.4 0.5 0.6 0.7 0.7 0.8 1.0 1.1 1.3 1.5 

Neighborhood Scale 1,053 0.9 0.2 0.3 0.4 0.4 0.6 0.6 0.8 1.0 1.1 1.5 1.9 

1-H DAILY AVG 

Microscale 1,077 0.8 0.2 0.3 0.4 0.5 0.6 0.7 0.8 1.0 1.0 1.3 1.4 

Middle Scale 2,053 0.6 0.0 0.2 0.3 0.4 0.5 0.5 0.6 0.7 0.7 0.8 0.9 

Neighborhood Scale 1,053 0.5 0.1 0.2 0.3 0.3 0.4 0.4 0.5 0.6 0.6 0.8 1.0 

8-H DAILY MAX 

Microscale 1,077 1.2 0.3 0.4 0.6 0.7 0.9 0.9 1.1 1.4 1.4 1.7 1.9 

Middle Scale 2,053 0.7 0.3 0.3 0.4 0.4 0.6 0.6 0.7 0.8 0.9 1.0 1.2 

Neighborhood Scale 1,053 0.7 0.3 0.3 0.3 0.3 0.4 0.5 0.6 0.8 0.8 1.2 1.5 

 

January 2010 A-58 
Table A-23. Comparison of distributional data at different monitoring scales for hourly, 1-h daily 

max, 24-h avg, and 8-h daily max data for Phoenix, AZ. 

PERCENTILES 

Time Scale N Mean Min 1 5 10 25 50 75 90 95 99 max 

ALL HOURLY 

Microscale 25,382 0.9 0.0 0.0 0.1 0.1 0.3 0.3 0.6 1.1 1.3 2.3 3.0 

Middle Scale 25,414 0.8 0.0 0.0 0.1 0.1 0.3 0.3 0.5 0.9 1.0 1.8 2.3 

Neighborhood Scale 51,246 0.7 0.0 0.0 0.1 0.1 0.2 0.3 0.4 0.7 0.8 1.8 2.4 

1-H DAILY MAX 

Microscale 1,063 2.2 0.0 0.2 0.5 0.7 1.1 1.2 1.9 2.8 3.1 4.2 4.7 

Middle Scale 1,066 1.8 0.1 0.3 0.5 0.7 1.0 1.1 1.6 2.2 2.4 3.2 3.8 

Neighborhood Scale 2,156 1.8 0.1 0.2 0.4 0.5 0.8 0.9 1.5 2.3 2.6 3.6 4.2 

1-H DAILY AVG 

Microscale 1,063 0.9 0.0 0.0 0.2 0.2 0.4 0.4 0.7 1.2 1.3 2.0 2.3 

Middle Scale 1,066 0.8 0.0 0.1 0.2 0.3 0.4 0.5 0.7 0.9 1.0 1.5 1.7 

Neighborhood Scale 2,156 0.7 0.0 0.1 0.2 0.2 0.3 0.4 0.5 0.9 0.9 1.5 1.8 

8-H DAILY MAX 

Microscale 1,063 1.5 0.3 0.3 0.3 0.4 0.6 0.7 1.2 2.0 2.2 3.1 3.5 

Middle Scale 1,066 1.2 0.3 0.3 0.3 0.4 0.7 0.7 1.0 1.5 1.7 2.3 2.7 

Neighborhood Scale 2,156 1.2 0.3 0.3 0.3 0.3 0.5 0.6 0.9 1.5 1.7 2.5 3.0 

 

January 2010 A-59 
Table A-24. Comparison of distributional data at different monitoring scales for hourly, 1-h daily 

max, 24-h avg, and 8-h daily max data for Pittsburgh, PA. 

PERCENTILES 

Time Scale N Mean Min 1 5 10 25 50 75 90 95 99 max 

ALL HOURLY 

Middle Scale 25,818 0.5 0.0 0.0 0.1 0.1 0.3 0.3 0.4 0.5 0.6 0.8 1.1 

Neighborhood Scale 77,000 0.3 0.0 0.0 0.0 0.0 0.1 0.1 0.2 0.3 0.4 0.6 0.8 

Urban Scale 76,940 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.3 0.3 0.6 0.8 

1-H DAILY MAX 

Middle Scale 1,079 0.9 0.0 0.2 0.4 0.4 0.6 0.6 0.8 1.1 1.1 1.6 1.9 

Neighborhood Scale 3,210 0.6 0.0 0.0 0.1 0.2 0.3 0.3 0.5 0.7 0.7 1.1 1.3 

Urban Scale 3,208 0.4 0.0 0.0 0.0 0.0 0.1 0.2 0.4 0.6 0.7 1.0 1.2 

1-H DAILY AVG 

Middle Scale 1,079 0.5 0.0 0.1 0.2 0.2 0.3 0.3 0.4 0.5 0.6 0.8 0.9 

Neighborhood Scale 3,210 0.3 0.0 0.0 0.0 0.0 0.1 0.2 0.3 0.3 0.4 0.6 0.7 

Urban Scale 3,208 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.3 0.3 0.6 0.7 

8-H DAILY MAX 

Middle Scale 1,079 0.7 0.3 0.3 0.3 0.3 0.4 0.4 0.6 0.7 0.8 1.1 1.3 

Neighborhood Scale 3,210 0.5 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.5 0.5 0.8 1.0 

Urban Scale 3,208 0.4 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.4 0.5 0.8 1.0 

 

Table A-25. Comparison of distributional data for hourly, 1-h daily max, 24-h avg, and 8-h daily max 

data for Seattle, WA. Microscale was the only scale at which monitoring was 

performed in Seattle, WA. 

PERCENTILES 

Time Scale N Mean Min 1 5 10 25 50 75 90 95 99 max 

ALL HOURLY 

Microscale 25,818 0.8 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.9 0.9 1.3 1.6 

1-H DAILY MAX 

Microscale 1,079 1.5 0.2 0.4 0.5 0.7 0.9 1.0 1.3 1.7 1.8 2.4 2.9 

1-H DAILY AVG 

Microscale 1,079 0.8 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.9 0.9 1.2 1.4 

8-H DAILY MAX 

Microscale 1,079 1.1 0.3 0.3 0.4 0.5 0.7 0.8 1.0 1.3 1.4 1.8 2.2 

 

January 2010 A-60 
Table A-26. Comparison of distributional data for hourly, 1-h daily max, 24-h avg, and 8-h daily max 

data for St. Louis, MO. Neighborhood scale was the only scale at which monitoring 

was performed in St. Louis, MO. 

PERCENTILES 

Time Scale N Mean Min 1 5 10 25 50 75 90 95 99 max 

ALL HOURLY 

Neighborhood Scale 51,263 0.4 0.0 0.1 0.2 0.2 0.3 0.3 0.4 0.5 0.5 0.6 0.8 

1-H DAILY MAX 

Neighborhood Scale 2,138 0.8 0.1 0.2 0.3 0.4 0.5 0.5 0.6 0.9 1.0 1.5 2.0 

1-H DAILY AVG 

Neighborhood Scale 2,138 0.4 0.0 0.1 0.2 0.3 0.3 0.3 0.4 0.5 0.5 0.6 0.7 

8-H DAILY MAX 

Neighborhood Scale 2,138 0.6 0.3 0.3 0.3 0.3 0.3 0.3 0.5 0.6 0.7 1.0 1.3 

 

January 2010 A-61 
Figure A-44. Seasonal plots of correlations between hourly CO concentration with hourly (1) 

SO2, (2) NO2, (3) O3, (4) PM10, and (5) PM2.5 concentrations for Anchorage, AK. Also 

shown are correlations between 24-h avg CO concentration with (6) daily max 1-h 

and (7) daily max 8-h CO concentrations and (8) between daily max 1-h and daily 

max 8-h CO concentrations. Refer the numbers in this caption to those on the yaxis of each seasonal plot. Note that the data are not obtained for Anchorage 

during the summer, and so are not presented here. 

January 2010 A-62 
Figure A-45. Seasonal plots of correlations between hourly CO concentration with hourly (1) 

SO2, (2) NO2, (3) O3, (4) PM10, and (5) PM2.5 concentrations for Atlanta, GA. Also 

shown are correlations between 24-h avg CO concentration with (6) daily max 1-h 

and (7) daily max 8-h CO concentrations and (8) between daily max 1-h and daily 

max 8-h CO concentrations. Refer the numbers in this caption to those on the yaxis of each seasonal plot. 

January 2010 A-63 
Figure A-46. Seasonal plots of correlations between hourly CO concentration with hourly (1) 

SO2, (2) NO2, (3) O3, (4) PM10, and (5) PM2.5 concentrations for Boston, MA. Also 

shown are correlations between 24-h avg CO concentration with (6) daily max 1-h 

and (7) daily max 8-h CO concentrations and (8) between daily max 1-h and daily 

max 8-h CO concentrations. Refer the numbers in this caption to those on the 

y-axis of each seasonal plot. 

January 2010 A-64 
Figure A-47. Seasonal plots of correlations between hourly CO concentration with hourly (1) 

SO2, (2) NO2, (3) O3, (4) PM10, and (5) PM2.5 concentrations for New York City, NY. 

Also shown are correlations between 24-h avg CO concentration with (6) daily 

max 1-h and (7) daily max 8-h CO concentrations and (8) between daily max 1-h 

and daily max 8-h CO concentrations. Refer the numbers in this caption to those 

on the y-axis of each seasonal plot. 

January 2010 A-65 
Figure A-48. Seasonal plots of correlations between hourly CO concentration with hourly (1) 

SO2, (2) NO2, (3) O3, (4) PM10, and (5) PM2.5 concentrations for Phoenix, AZ. Also 

shown are correlations between 24-h avg CO concentration with (6) daily max 1-h 

and (7) daily max 8-h CO concentrations and (8) between daily max 1-h and daily 

max 8-h CO concentrations. Refer the numbers in this caption to those on the 

y-axis of each seasonal plot. 

January 2010 A-66 
Figure A-49. Seasonal plots of correlations between hourly CO concentration with hourly (1) 

SO2, (2) NO2, (3) O3, (4) PM10, and (5) PM2.5 concentrations for Seattle, WA. Also 

shown are correlations between 24-h avg CO concentration with (6) daily max 1-h 

and (7) daily max 8-h CO concentrations and (8) between daily max 1-h and daily 

max 8-h CO concentrations. Refer the numbers in this caption to those on the 

y-axis of each seasonal plot. 

January 2010 A-67 
Figure A-50. Cross-correlation functions for each season combined across sites where CO 

and O3 monitors were co-located in Atlanta, Boston, Denver, Los Angeles, New 

York City, and Phoenix. 

January 2010 A-68