Attachment A

State-by-State Maps and Number of Days ≥0.060 ppm

The ambient ozone data in this document were compiled from 

analyses used in support of the proposed rule for the O3 NAAQS: 

Revisions to the Length of the Required O3 Monitoring Seasons

Docket ID No. EPA-HQ-OAR-2008-0699
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Alabama

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

2 of 26 ozone sites operated yearround (8%)

Exceedance days during 2005-2006: 

0 (B), 0(A)

Exceedance days during 2007-2009: 

1 (B), 1 (A): 2/28; 11/5

Exceedance days during 2010-2013:

1 (B), 1 (A)

Period of exceedances: 2/17, 11/12

Notes:

No changes proposed

1

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before 

season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Alaska

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

2 of 5 ozone site operated year-round 

(40%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

0 (B), 0 (A)

Notes:

No changes proposed

2

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Arizona

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

35 of 48 ozone sites operated year-round 

(73%) due to Region 9 granted waivers

Exceedance days during 2005-2006: 

2 (B), 0 (A): 3/5, 3/25

Exceedance days during 2007-2009: 

5 (B), 0 (A): 3/10-3/19

Exceedance days during 2010-2013: 

0 (B), 0 (A)

Period of exceedances: N/A

Notes:

Current analysis did not consider 

waivers

Final rule will moot the current 

waivers

3

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Arkansas

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

9 of 10 ozone sites operated year-round 

(90%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

2 (B), 0 (A): 2/21, 2/28

 Exceedance days during 2010-2013: 

1 (B), 0 (A)

Period of exceedances: 2/13

Notes:

No changes proposed

4

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

California

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

172 of 201 ozone sites operated yearround (85%) due to Region 9 granted 

waivers

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

0 (B), 0 (A)

Period of exceedances: N/A

Notes:

Current analysis did not consider 

waivers

Final rule will revoke the current 

waivers

5

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Colorado

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

34 of 53 ozone sites operated year-round 

(64%)

Exceedance days during 2005-2006: 

3 (B), 0 (A)

Exceedance days during 2007-2009: 

8 (B), 3 (A): 2/16 – 11/27

Exceedance days during 2010-2013:

60 (B), 19 (A)

 Period of exceedances: 1/7 – 2/28, 

10/1 – 12/31

Notes:

Propose year-round monitoring season

Region 8 supported year-round 

monitoring season with waivers in 2009 

proposal

6

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Connecticut

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

3 of 13 ozone sites operated year-round 

(23%)

Exceedance days during 2005-2006: 

2 (B), 2 (A)

Exceedance days during 2007-2009: 

0 (B), 3 (A): 10/4 – 10/6

Exceedance days during 2010-2013:

3 (B), 2 (A)

 Period of exceedances: 3/19 – 3/21, 

10/12 – 10/13

Notes:

Propose adding March 

Year-round data limited

Consistency with RI and MA 

considered

7

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Delaware

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

6 of 7 ozone sites operated year-round 

(86%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

1 (B), 0 (A): 3/14

 Exceedance days during 2010-2013:

4 (B), 0 (A)

 Period of exceedances: 3/10 – 3/25

Notes:

Propose adding March

Areal coverage is small

Consistency with NJ, PA, VA, MD

8

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

District of Columbia

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

3 of 4 ozone sites operated year-round 

(75%)

Exceedance days during 2005-2006: 

2 (B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

3 (B), 0 (A)

 Period of exceedances: 3/19 – 3/21

Notes:

Propose adding March

Areal coverage is small

Consistency with MD, VA, DE

9

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Florida

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

59 of 62 ozone sites operated year-round 

(95%)

Exceedance days during 2005-2006: 

6 (B), 7 (A)

Exceedance days during 2007-2009: 

14 (B), 12(A): 1/4 – 11/28

Exceedance days during 2010-2013: 

13 (B), 5 (A)

 Period of exceedances: 1/24 – 2/28, 

11/1 – 11/23

Notes:

Propose adding 4 months for yearround monitoring season 

Vast majority of “before” exceedances 

occurred in February and no “after” 

exceedances in December

10

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Georgia

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

2 of 21 ozone sites operated year-round 

(10%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 0 (A)

 Exceedance days during 2010-2013:

2 (B), 0 (A)

Period of exceedances: 2/14, 2/17

Notes:

No changes proposed

Year-round data limited

Consistency with AL, SC

11

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Hawaii

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

2 of 2 ozone sites operated year-round 

(100%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 0 (A)

 Exceedance days during 2010-2013:

0 (B), 0 (A)

Period of exceedances: N/A

Notes:

No changes proposed

12

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Idaho

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

2 of 6 ozone sites operated year-round 

(33%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

1 (B), 0 (A): 4/27

 Exceedance days during 2010-2013:

8 (B), 1 (A)

Period of exceedances: 4/4 – 4/24, 10/2

Notes:

Propose adding April

Year-round data limited

Consistency with MT

13

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Illinois

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

26 of 44 ozone sites operated yearround (59%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

1 (B), 0 (A): 3/17

Exceedance days during 2010-2013: 

6 (B), 1 (A)

Period of exceedances: 2/13, 3/15 –

3/31, 11/2

Notes:

Propose adding March

Consistent with surrounding states

14

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Indiana

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

3 of 46 ozone sites operated year-round 

(7%)

Exceedance days during 2005-2006: 

0 (B), 2 (A)

Exceedance days during 2007-2009: 

0 (B), 5 (A): 10/1 – 10/8 

Exceedance days during 2010-2013: 

2 (B), 9 (A)

Period of exceedances: 3/21, 3/31, 10/5 –

10/17

Notes:

Proposed adding March and Oct.

Year-round data limited

Consistent with IL, KY, OH, MI

15

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Iowa

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

1 of 15 ozone sites operated year-round 

(7 %)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

0 (B), 0 (A)

Period of exceedances: N/A

Notes:

Propose adding March

Year-round data limited

Consistent with surrounding states 

16

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Kansas

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

11 of 11 ozone sites operated year-round (100%)

Exceedance days during 2005-2006: 

3 (B), 1 (A)

Exceedance days during 2007-2009: 

5 (B), 0 (A): 3/6 – 3/29

Exceedance days during 2010-2013: 

17 (B), 1 (A)

Period of exceedances: 2/12 – 3/31, 11/1

Notes:

Propose adding March

Before exceedances 4 of 17 in Feb., 13 of 17 

in March

KS commented in last proposal that ozone 

season should be same as MO due to unified 

Kansas City planning area

Proposal maintains consistency with MO

17

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Kentucky

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

5 of 32 ozone sites operated yearround (16%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 5 (A): 11/1 – 11/5 

Exceedance days during 2010-2013: 

0 (B), 3 (A): 11/11 – 11/13

Period of exceedances:

Notes:

No changes proposed

Consistency with IL, IN, OH

18

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Louisiana (northern) AQCR 019, 022

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

3 of 3 ozone sites operated year-round 

(100%) for these AQCR’s 

Exceedance days during 2005-2006: 

1(B), 1(A)

Exceedance days during 2007-2009: 

3 (B), 2(A): 2/6 – 11/25

Exceedance days during 2010-2013: 

0 (B), 1(A): 11/1

Notes:

No changes proposed

19

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Louisiana (southern) AQCR 106

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

21 of 24 ozone sites operated yearround (88%) for these AQCR’s

Exceedance days during 2005-2006: 

0(B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

0 (B), 0 (A)

Period of exceedances: N/A

Notes:

No changes proposed

20

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Maine

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

5 of 19 ozone sites operated year-round 

(26%)

Exceedance days during 2005-2006: 

2(B), 1 (A)

Exceedance days during 2007-2009: 

1 (B), 0 (A): 3/14

 Exceedance days during 2010-2013: 

3 (B), 0 (A)

Period of exceedances: 3/12, 3/19, 3/31

Notes:

No changes proposed

21

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Maryland

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

6 of 21 ozone sites operated yearround (29%)

Exceedance days during 2005-2006: 

2(B), 1 (A)

Exceedance days during 2007-2009: 

5 (B), 0 (A): 3/10 – 3/18 

Exceedance days during 2010-2013: 

10 (B), 0 (A)

Period of exceedances: 2/17, 3/10 – 3/30

Notes:

Propose adding March

1 of 10 exceedances on 2/17, rest 

in March

22

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Massachusetts

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

5 of 19 ozone sites operated year-round 

(26%)

Exceedance days during 2005-2006: 

2 (B), 0 (A)

Exceedance days during 2007-2009: 

2 (B), 3 (A): 3/14 – 10/27

Exceedance days during 2010-2013: 

5 (B), 2 (A)

Period of exceedances: 3/7 – 3/31, 10/9 –

10/10

Notes:

Propose adding March

Consistency with CT and RI

23

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Michigan

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

7 of 30 ozone sites operated year-round 

(23%)

Exceedance days during 2005-2006: 

2 (B), 3 (A): 3/28 – 10/5 

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

5 (B), 6 (A)

Period of exceedances: 3/9 – 3/31, 10/6 –

10/11

Notes:

Propose adding March and Oct.

Consistency with surrounding IL, 

OH, IN, WI

24

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Minnesota

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

2 of 18 ozone sites operated year-round 

(11%)

Exceedance days during 2005-2006: 

1 (B), 0 (A): 3/29

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

5 (B), 0 (A)

Period of exceedances: 3/7, 3/10, 3/29-

3/30

Notes:

Propose adding March

Year-round data limited

Regional consistency considered

25

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Mississippi

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

2 of 12 ozone sites operated yearround (17%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

1 (B), 1 (A)

Period of exceedances: 2/13, 11/2

Notes:

No changes proposed

26

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Missouri

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

2 of 25 ozone sites operated year-round (8%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

2 (B), 0 (A)

Period of exceedances: 3/3, 3/11

Notes:

Propose adding March

Consistency with KS which has had 

numerous March exceedances (11) and IL 

where also propose adding March

Year-round data limited

27

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Montana

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

7 of 9 ozone sites operated year-round 

(78%)

Exceedance days during 2005-2006: 

4 (B), 0 (A)

Exceedance days during 2007-2009: 

2 (B), 0 (A): 5/25, 5/26

Exceedance days during 2010-2013: 

9 (B), 0 (A)

Period of exceedances: 4/20-5/17

Notes:

Propose adding April and May

4 exceedance days in April and 5 in 

May

28

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Nebraska

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

2 of 7 ozone sites operated year-round 

(29%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

4 (B), 0 (A)

Period of exceedances: 3/24, 3/25, 3/26, 

3/29

Notes:

Propose adding March

Year-round data limited

Consistency with SD, KS, IA, MO

29

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Nevada

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

16 of 37 ozone sites operated yearround (43%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

0 (B), 0 (A)

Period of exceedances: N/A

Notes:

Current analysis did not consider 

waivers

Final rule will moot current waivers 

30

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

New Hampshire

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

7 of 13 ozone sites operated year-round 

(54%)

Exceedance days during 2005-2006: 

1 (B), 0 (A): 3/31

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

13 (B), 6 (A)

Period of exceedances: 2/17, 2/18, 3/11 

– 3/31, 10/1 – 10/25

Notes:

Propose adding March

Consistency with other New 

England states

31

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

New Jersey

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

14 of 17 ozone sites operated yearround (82%)

Exceedance days during 2005-2006: 

4 (B), 0 (A)

Exceedance days during 2007-2009: 

1 (B), 0 (A): 3/11

Exceedance days during 2010-2013: 

3 (B), 0 (A)

Period of exceedances: 3/19, 3/20, 3/21

Notes:

Propose adding March

Consistency with surrounding PA, 

NY, MD, DE

32

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

New Mexico

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

24 of 27 ozone sites operated yearround (92%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

0 (B), 0 (A)

Period of exceedances: N/A

Notes:

Analysis did not consider waivers

Final rule will moot current waivers

33

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

New York

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

34 of 38 ozone sites operated year-round 

(89%)

Exceedance days during 2005-2006: 

4 (B), 0 (A)

Exceedance days during 2007-2009: 

7 (B), 0 (A): 3/3 – 3/22 

Exceedance days during 2010-2013: 

16 (B), 0 (A)

Period of exceedances: 2/17, 3/7 – 3/30

Notes:

Propose adding March

Consistent with PA, CT, NJ proposal

State commented on last proposal that 

northern states should have shorter 

season (already permissible through RA 

waiver process)

34

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

North Carolina

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

7 of 49 ozone sites operated year-round 

(14%)

Exceedance days during 2005-2006: 

3 (B), 0 (A)

Exceedance days during 2007-2009: 

16 (B), 0 (A): 3/10 – 3/28 

Exceedance days during 2010-2013: 

17 (B), 0 (A)

Period of exceedances: 2/17, 3/8 – 3/30

Notes:

Propose adding March

Exceedance day count significant 

given low number of year-round 

monitors

Consistency with VA, SC

35

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

North Dakota

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

8 of 9 ozone sites operated year-round 

(89%)

Exceedance days during 2005-2006: 

5 (B), 0 (A)

Exceedance days during 2007-2009: 

4 (B), 0 (A): 3/13 – 4/29 

Exceedance days during 2010-2013: 

12 (B), 1 (A)

Period of exceedances: 3/8 – 4/23, 

10/5

Notes:

Propose adding March and April

36

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Ohio

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

6 of 53 ozone sites operated year-round 

(11%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

1 (B), 2 (A): 3/3, 11/1, 11/8

Exceedance days during 2010-2013: 

13 (B), 2 (A)

Period of exceedances: 2/17, 3/7 –

3/31, 11/10, 11/13

Notes:

Propose adding March

Consistency with IN, MI, and PA 

proposal

37

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Oklahoma

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

16 of 33 ozone sites operated yearround (48%)

Exceedance days during 2005-2006: 

2 (B), 0 (A)

Exceedance days during 2007-2009: 

1 (B), 0 (A): 2/14

Exceedance days during 2010-2013: 

1 (B), 0 (A)

Period of exceedances: 1/29

Notes:

No changes proposed

Extensive year-round network

Consistency with northern TX

38

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Oregon

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

1 of 10 ozone sites operated year-round 

(10%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

0 (B), 0 (A)

Period of exceedances: N/A

Notes:

No changes proposed

Year-round data limited

Consistency with WA

39

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Pennsylvania

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

50 of 59 ozone sites operated yearround (85%)

Exceedance days during 2005-2006: 

2 (B), 0 (A)

Exceedance days during 2007-2009: 

1 (B), 0 (A): 3/18

Exceedance days during 2010-2013: 

14 (B), 0 (A)

Period of exceedances: 3/7 – 3/31

Notes:

Propose adding March

Consistency with NY, NJ, OH, 

MD, DE proposal

40

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Rhode Island

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

1 of 3 ozone sites operated year-round 

(33%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

3 (B), 0 (A)

Period of exceedances: 3/19, 3/20, 3/31

Notes:

Propose adding March

Consistency with CT and MA proposal

Limited year-round monitors

41

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

South Carolina

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

9 of 24 ozone sites operated yearround (38%)

Exceedance days during 2005-2006: 

18 (B), 0 (A)

Exceedance days during 2007-2009: 

29 (B), 1 (A): 2/16 – 11/2

Exceedance days during 2010-2013: 

23 (B), 0 (A)

Period of exceedances: 2/21, 3/3 –

3/31

Notes:

Propose adding March

Consistent with rest of Southeast

42

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

South Dakota

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

7 of 7 ozone sites operated year-round 

(100%)

Exceedance days during 2005-2006: 

16 (B), 0 (A)

Exceedance days during 2007-2009: 

24 (B), 0 (A): 4/18 – 5/31

Exceedance days during 2010-2013: 

31 (B), 6 (A)

Period of exceedances: 3/5 – 5/30, 

10/3 – 10/6

Notes:

Propose adding 4 months

 4 exceedance days in March, 

rest April-May, 5 in Oct.

43

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Tennessee

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

5 of 27 ozone sites operated year-round 

(19%)

Exceedance days during 2005-2006: 

1 (B), 0 (A)

Exceedance days during 2007-2009: 

2 (B), 4 (A): 2/24, 2/28, 11 – 11/5

Exceedance days during 2010-2013: 

6 (B), 4 (A)

Period of exceedances: 2/13 – 2/21, 11/1 –

11/13

Notes:

No changes proposed

Regional consistency considered

State comment on last proposal 

opposed change, would affect 

agreements with AR, KY, GA 

Proposal maintains consistency with 

AR, KY, GA

44

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Texas (northern) AQCR 022,210, 211, 212, 215, 217, 218

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

31 of 36 ozone sites operated yearround (86%) for these AQCR’s

Exceedance days during 2005-2006: 

0 (B), 3 (A)

Exceedance days during 2007-2009: 

2 (B), 6 (A): 2/22, 2/28, 11/2 – 11/8

Exceedance days during 2010-2013: 

1 (B), 3 (A) Period of exceedances: 2/27, 

11/1 - 11/8

Notes:

Propose adding Nov.

Consistency with OK, AR

45

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Texas (southern) AQCR 106, 153, 213, 214, 216

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

44 of 47 ozone sites operated yearround (94%) for these AQCR’s

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

0 (B), 0 (A)

Period of exceedances: N/A

Notes:

No changes proposed

46

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Utah

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

13 of 30 ozone sites operated year-round 

(43%)

Exceedance days during 2005-2006: 

26 (B), 1 (A)

Exceedance days during 2007-2009: 

55 (B), 11 (A): 3/4 - 12/30

Exceedance days during 2010-2013: 

230 (B), 19 (A)

Period of exceedances: 1/1 - 4/30, 10/1 -

12/31

Notes:

Propose adding 7 months for year 

round season

Exceedances > 100 ppb Dec. - March

Consistent with proposed CO season 

and current NV, AZ seasons

47

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Vermont

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

2 of 2 ozone sites operated year-round 

(100%)

Exceedance days during 2005-2006: 

2 (B), 3 (A)

Exceedance days during 2007-2009: 

2 (B), 0 (A): 3/17, 3/22

Exceedance days during 2010-2013: 

1 (B), 0 (A)

Period of exceedances: 3/31

Notes:

No changes proposed

48

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Virginia

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

4 of 30 ozone sites operated year-round 

(13%)

Exceedance days during 2005-2006: 

4 (B), 1 (A)

Exceedance days during 2007-2009: 

8 (B), 1 (A): 3/3 – 3/27, 11/11

Exceedance days during 2010-2013: 

13 (B), 0 (A)

 Period of exceedances: 2/17, 3/8 –

3/30

Notes:

Propose adding March

Year-round data limited

Consistency with NC, SC proposal; 

existing KY seasons

49

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Washington

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

5 of 18 ozone sites operated year-round 

(28%)

Exceedance days during 2005-2006: 

0 (B), 1 (A)

Exceedance days during 2007-2009: 

1 (B), 0 (A): 4/6

Exceedance days during 2010-2013: 

0 (B), 2 (A)

Period of exceedances: 10/27, 10/28 

Notes:

No changes proposed

50

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

West Virginia

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

2 of 10 ozone sites operated year-round 

(20%)

Exceedance days during 2005-2006: 

0 (B), 0 (A)

Exceedance days during 2007-2009: 

0 (B), 0 (A)

Exceedance days during 2010-2013: 

2 (B), 0 (A)

Period of exceedances: 3/20, 3/21

Notes:

Propose adding March

Regionally consistent with OH, MD, 

PA, VA, and KY

51

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Wisconsin

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

5 of 37 ozone sites operated year-round 

(14%)

Exceedance days during 2005-2006: 

7 (B), 0 (A)

Exceedance days during 2007-2009: 

2 (B), 0 (A): 4/5, 4/6

Exceedance days during 2010-2013: 

8 (B), 0 (A)

 Period of exceedances: 3/5 – 3/31

Notes:

Propose adding March to April 15

Net season: March 1 – Oct. 15

52

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season
Year-round monitor Season-only monitor

[Based on data completeness during 2010 – 2013]

Wyoming

CURRENT Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

PROPOSED Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

24 of 34 ozone sites operated year-round 

(71%)

Exceedance days during 2005-2006: 

46 (B), 0 (A)

Exceedance days during 2007-2009: 

51 (B), 0 (A): 1/25 – 3/30 

Exceedance days during 2010-2013: 

55 (B), 0 (A)

Period of exceedances: 1/29 – 3/31

Notes:

Propose adding Jan., Feb., March and 

removing Oct.

Two exceedance days in Jan., rest in 

Feb. and March

Consistent with start month of UT, CO 

53

Exceedances: Days >= 8-hour 0.060 ppm, (B) = Before season, (A)=After season