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Status of Designated Areas for the CO (1971) NAAQS

by Area Name, State
NOTE: As of 03/12/2021, these reports are no longer being updated. For the latest information, see the SIP Status Tools.




CO (1971) Areas    Return to NAAQS selection
 
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Area		 State Status Designation
Date		 Classification 2010
Population
(state portion)		 Meets NAAQS
Basis		 Design Value
Annual
(ppm)
(entire area)		 Meets
NAAQS		 SIP
Requirements
Original/
Approved		 Clean Air
Determination
Citation
Effective Date
Click to view
FR notice 		Redesignation
Request Date		 Redesignation
Citation
Effective Date
Click to view
FR notice
Albuquerque Area NM Maintenance 11/15/1990 Moderate <= 12.7ppm 662,564 2019 1.0 Yes 5 / 5  
 		 05/11/1995 07/15/1996
61 FR 29970
Anchorage Area AK Maintenance 11/15/1990 Serious 286,227 2019 2.7 Yes 7 / 7  
 		 02/18/2004 07/23/2004
69 FR 34935
Atlantic City Area NJ Maintenance 11/15/1990 Not Classified 44,944 2019   No Data 1 / 1  
 		 09/28/1995 02/05/1996
61 FR 33678
Bakersfield Area CA Maintenance 11/15/1990 Not Classified 468,092 2019 1.1 Yes 1 / 0  
 		 07/03/1996 06/01/1998
63 FR 15305
Baltimore Area MD Maintenance 11/15/1990 Moderate <= 12.7ppm 15,455 2019   No Data 4 / 4  
 		 09/20/1995 12/15/1995
60 FR 55321
Billings Area MT Maintenance 11/15/1990 Not Classified 104,360 2019   No Data 1 / 1  
 		 02/09/2001 04/22/2002
67 FR 7966
Boise-Northern Ada County Area ID Maintenance 11/15/1990 Not Classified 257,440 2019 1.6 Yes 1 / 1  
 		 01/17/2002 12/27/2002
67 FR 65713
Boston Area MA Maintenance 11/15/1990 Moderate <= 12.7ppm 1,135,003 2019 1.0 Yes 4 / 4  
 		 12/12/1994 04/01/1996
61 FR 2918
Burlington Area NJ Maintenance 11/15/1990 Not Classified 10,993 2019   No Data 1 / 1  
 		 09/28/1995 02/05/1996
61 FR 33678
Charlotte Area NC Maintenance 11/15/1990 Not Classified 919,628 2019 1.4 Yes 1 / 1  
 		 10/07/1994 09/18/1995
60 FR 39258
Chico Area CA Maintenance 11/15/1990 Moderate <= 12.7ppm 86,963 2019 6.4 Yes 4 / 3  
 		 07/03/1996 06/01/1998
63 FR 15305
Cleveland Area OH Maintenance 11/15/1990 Moderate <= 12.7ppm 1,280,122 2019 3.1 Yes 4 / 4  
 		 10/16/1992 03/07/1994
59 FR 5332
Colorado Springs Area CO Maintenance 11/15/1990 Moderate <= 12.7ppm 555,742 2019 1.6 Yes 4 / 4  
 		 08/19/1998 10/25/1999
64 FR 46279
Denver-Boulder Area CO Maintenance 11/15/1990 Serious 2,610,637 2019 2.9 Yes 7 / 7  
 		 05/10/2000 01/14/2002
66 FR 64751
Detroit Area MI Maintenance 11/15/1990 Not Classified 1,382,239 2019 2.4 Yes 1 / 1  
 		 03/18/1999 08/30/1999
64 FR 35017
Duluth Area MN Maintenance 01/06/1992 Moderate <= 12.7ppm 85,857 2019   No Data 4 / 4  
 		 10/30/1992 06/13/1994
59 FR 17708
East Chicago Area IN Maintenance 11/15/1990 Not Classified 5,208 2019 1.6 Yes 1 / 1  
 		 11/10/1999 03/20/2000
65 FR 2883
El Paso TX Maintenance 11/15/1990 Moderate <= 12.7ppm 73,100 2019 2.4 Yes 5 / 5  
 		 02/13/2008 10/03/2008
73 FR 45162
Eugene-Springfield Area OR Maintenance 11/15/1990 Not Classified 234,972 2019   No Data 1 / 1  
 		 12/06/1993 02/04/1994
58 FR 64161
Fairbanks Area AK Maintenance 11/15/1990 Serious 46,211 2019 2.1 Yes 6 / 6  
 		 06/21/2004 09/27/2004
69 FR 44601
Fort Collins Area CO Maintenance 11/15/1990 Moderate <= 12.7ppm 170,639 2019 1.6 Yes 4 / 4  
 		 08/09/2002 09/22/2003
68 FR 43316
Freehold Area NJ Maintenance 11/15/1990 Not Classified 12,734 2019   No Data 1 / 1  
 		 09/28/1995 02/05/1996
61 FR 33678
Fresno Area CA Maintenance 11/15/1990 Moderate > 12.7ppm 631,483 2019 1.8 Yes 6 / 5  
 		 07/03/1996 06/01/1998
63 FR 15305
Grants Pass Area OR Maintenance 11/15/1990 Moderate <= 12.7ppm 22,449 2019   No Data 4 / 4  
 		 11/10/1999 10/30/2000
65 FR 52932
Great Falls Area MT Maintenance 11/15/1990 Not Classified 57,573 2019   No Data 1 / 1  
 		 02/09/2001 07/08/2002
67 FR 31143
Greeley Area CO Maintenance 11/15/1990 Not Classified 138,101 2019 0.9 Yes 1 / 1  
 		 09/22/1997 05/10/1999
64 FR 11775
Hartford-New Britain-Middletown Area CT Maintenance 11/15/1990 Moderate <= 12.7ppm 1,106,678 2019 1.0 Yes 4 / 4  
 		 09/30/1994 01/02/1996
61 FR 24239
Indianapolis Area IN Maintenance 11/15/1990 Not Classified 61,160 2019 2.2 Yes 1 / 1  
 		 11/10/1999 03/20/2000
65 FR 2883
Klamath Falls Area OR Maintenance 01/06/1992 Moderate <= 12.7ppm 20,703 2019   No Data 4 / 4  
 		 11/20/2000 11/19/2001
66 FR 48349
Lake Tahoe Nevada Area NV Maintenance 11/15/1990 Not Classified 33,259 2019   No Data 1 / 0  
 		 10/27/2003 02/13/2004
68 FR 69611
Lake Tahoe North Shore Area CA Maintenance 11/15/1990 Not Classified 16,132 2019   No Data 0 / 0  
 		 07/03/1996 06/01/1998
63 FR 15305
Lake Tahoe South Shore Area CA Maintenance 11/15/1990 Moderate <= 12.7ppm 43,110 2019   No Data 4 / 3  
 		 07/03/1996 06/01/1998
63 FR 15305
Las Vegas Area NV Maintenance 11/15/1990 Serious 679,034 2019 2.8 Yes 6 / 6  
 		 09/18/2008 09/27/2010
75 FR 59090
Longmont Area CO Maintenance 11/15/1990 Moderate <= 12.7ppm 86,558 2019   No Data 5 / 5  
 		 08/19/1998 11/23/1999
64 FR 51694
Los Angeles-South Coast Air Basin Area CA Maintenance 11/15/1990 Serious 15,799,134 2019 3.1 Yes 7 / 7  
 		 02/24/2006 06/11/2007
72 FR 26718
Lowell Area MA Maintenance 11/15/1990 Not Classified 106,519 2019   No Data 0 / 0  
 		 05/25/2001 04/22/2002
67 FR 7272
Manchester Area NH Maintenance 11/15/1990 Not Classified 109,565 2019   No Data 0 / 0  
 		 02/02/1999 01/29/2001
65 FR 71060
Medford Area OR Maintenance 11/15/1990 Moderate <= 12.7ppm 86,056 2019   No Data 5 / 5  
 		 06/02/2001 09/23/2002
67 FR 48388
Memphis Area TN Maintenance 11/15/1990 Moderate <= 12.7ppm 927,644 2019 0.9 Yes 5 / 5  
 		 10/19/1993 09/26/1994
59 FR 37939
Minneapolis-St. Paul Area MN Maintenance 11/15/1990 Moderate <= 12.7ppm 2,920,178 2019 3.9 Yes 5 / 5  
 		 05/13/1999 11/29/1999
64 FR 58347
Missoula Area MT Maintenance 11/15/1990 Moderate <= 12.7ppm 59,733 2019   No Data 4 / 4  
 		 05/27/2005 09/17/2007
72 FR 46158
Modesto Area CA Maintenance 11/15/1990 Moderate <= 12.7ppm 320,707 2019 1.9 Yes 4 / 3  
 		 07/03/1996 06/01/1998
63 FR 15305
Morristown Area NJ Maintenance 11/15/1990 Not Classified 21,955 2019   No Data 1 / 1  
 		 09/28/1995 02/05/1996
61 FR 33678
Nashua Area NH Maintenance 11/15/1990 Not Classified 86,494 2019   No Data 0 / 0  
 		 02/01/1999 01/29/2001
65 FR 71060
New Haven-Meriden-Waterbury Area CT Maintenance 11/15/1990 Not Classified 945,612 2019 1.2 Yes 0 / 0  
 		 01/22/1997 12/04/1998
63 FR 53282
New York-N. New Jersey-Long Island Area CT Maintenance 11/15/1990 Moderate > 12.7ppm 907,442 2019 2.7 Yes 6 / 6  
 		 05/29/1998 05/10/1999
64 FR 12005
New York-N. New Jersey-Long Island Area NY Maintenance 11/15/1990 Moderate > 12.7ppm 10,463,778 2019 2.7 Yes 7 / 7  
 		 08/30/1999 05/20/2002
67 FR 19337
New York-N. New Jersey-Long Island Area NJ Maintenance 11/15/1990 Moderate > 12.7ppm 3,159,966 2019 2.7 Yes 7 / 7  
 		 01/15/2002 10/22/2002
67 FR 54574
Ogden Area UT Maintenance 11/15/1990 Moderate <= 12.7ppm 82,825 2019 1.3 Yes 4 / 4  
 		 01/14/1997 05/08/2001
66 FR 14078
Oshkosh Area; Winnebago County (part); City of Oshkosh WI Maintenance 01/06/1992 Not Classified         0 / 0  
 		 04/07/1994 10/17/1994
59 FR 42168
Penns Grove Area NJ Maintenance 11/15/1990 Not Classified 5,201 2019   No Data 1 / 1  
 		 09/28/1995 02/05/1996
61 FR 33678
Perth Amboy Area NJ Maintenance 11/15/1990 Not Classified 49,645 2019   No Data 1 / 1  
 		 09/28/1995 02/05/1996
61 FR 33678
Philadelphia-Camden County Area NJ Maintenance 11/15/1990 Moderate <= 12.7ppm 513,657 2019 1.7 Yes 4 / 4  
 		 09/28/1995 02/05/1996
61 FR 33678
Philadelphia-Camden County Area PA Maintenance 11/15/1990 Moderate <= 12.7ppm 673,750 2019 1.7 Yes 4 / 4  
 		 09/08/1995 03/15/1996
61 FR 2926
Phoenix Area AZ Maintenance 11/15/1990 Serious 3,763,324 2019 2.9 Yes 6 / 5  
 		 06/16/2003 04/08/2005
70 FR 11553
Pittsburgh Area PA Maintenance 11/15/1990 Not Classified 320,395 2019 1.4 Yes 1 / 1  
 		 08/17/2001 01/13/2003
67 FR 68521
Portland Area: Portland Metro Service District Boundary OR Maintenance 11/15/1990 Moderate <= 12.7ppm 1,330,473 2019   No Data 5 / 5  
 		 09/09/1996 10/02/1997
62 FR 46208
Provo Area UT Maintenance 11/15/1990 Moderate > 12.7ppm 166,596 2019   No Data 6 / 6  
 		 04/01/2004 01/03/2006
70 FR 66264
Raleigh-Durham Area NC Maintenance 01/06/1992 Moderate <= 12.7ppm 1,168,580 2019 1.2 Yes 4 / 4  
 		 10/07/1994 09/18/1995
60 FR 39258
Reno Area NV Maintenance 11/15/1990 Moderate <= 12.7ppm 221,743 2019 1.6 Yes 4 / 3  
 		   08/04/2008
73 FR 38124
Sacramento Area CA Maintenance 11/15/1990 Moderate <= 12.7ppm 1,530,116 2019 3.6 Yes 4 / 3  
 		 07/03/1996 06/01/1998
63 FR 15305
Salem Area OR Maintenance 11/15/1990 Not Classified 156,100 2019   No Data 1 / 1  
 		 08/09/2007 03/02/2009
73 FR 79655
Salt Lake City Area UT Maintenance 11/15/1990 Not Classified 186,440 2019 2.8 Yes 2 / 2  
 		 11/24/1995 03/22/1999
64 FR 3216
San Diego Area CA Maintenance 11/15/1990 Moderate <= 12.7ppm 2,909,194 2019 1.7 Yes 4 / 3  
 		 07/03/1996 06/01/1998
63 FR 15305
San Francisco-Oakland-San Jose Area CA Maintenance 11/15/1990 Moderate <= 12.7ppm 4,296,499 2019 3.0 Yes 4 / 3  
 		 07/03/1996 06/01/1998
63 FR 15305
Seattle-Tacoma Area WA Maintenance 11/15/1990 Moderate > 12.7ppm 3,016,710 2019 1.2 Yes 7 / 7  
 		 03/04/1996 10/11/1996
61 FR 53323
Somerville Area NJ Maintenance 11/15/1990 Not Classified 15,557 2019   No Data 1 / 1  
 		 09/28/1995 02/05/1996
61 FR 33678
Spokane Area WA Maintenance 11/15/1990 Serious 363,834 2019   No Data 7 / 7  
 		 11/29/2004 08/29/2005
70 FR 37269
Springfield Area MA Maintenance 11/15/1990 Not Classified 153,060 2019 1.2 Yes 0 / 0  
 		 05/25/2001 04/22/2002
67 FR 7272
St. Louis Area MO Maintenance 11/15/1990 Not Classified 1,227,527 2019 1.7 Yes 1 / 1  
 		 06/13/1997 03/29/1999
64 FR 3855
Stockton Area CA Maintenance 11/15/1990 Moderate <= 12.7ppm 373,545 2019 2.4 Yes 4 / 3  
 		 07/03/1996 06/01/1998
63 FR 15305
Syracuse Area; Onondaga County NY Maintenance 11/15/1990 Moderate <= 12.7ppm 467,026 2019   No Data 0 / 0  
 		 11/12/1992 09/29/1993
58 FR 50851
Toms River Area NJ Maintenance 11/15/1990 Not Classified 10,667       1 / 1  
 		 09/28/1995 02/05/1996
61 FR 33678
Trenton Area NJ Maintenance 11/15/1990 Not Classified 97,712 2019   No Data 1 / 1  
 		 09/28/1995 02/05/1996
61 FR 33678
Tucson Area AZ Maintenance 11/15/1990 Not Classified 595,314 2019 0.9 Yes 1 / 1  
 		 10/06/1997 07/10/2000
65 FR 36353
Vancouver Area: Clark County (part) WA Maintenance 11/15/1990 Moderate <= 12.7ppm 400,271 2019   No Data 5 / 5  
 		 03/21/1996 10/21/1996
61 FR 54560
Waltham Area MA Maintenance 11/15/1990 Not Classified 60,632 2019   No Data 0 / 0  
 		 05/25/2002 04/22/2002
67 FR 7272
Washington Area DC Maintenance 11/15/1990 Moderate <= 12.7ppm 601,723 2019 1.9 Yes 4 / 4  
 		 10/12/1995 03/15/1996
61 FR 2931
Washington Area MD Maintenance 11/15/1990 Moderate <= 12.7ppm 843,775 2019 1.9 Yes 4 / 4  
 		 10/12/1995 03/15/1996
61 FR 2931
Washington Area VA Maintenance 11/15/1990 Moderate <= 12.7ppm 347,593 2019 1.9 Yes 4 / 4  
 		 10/04/1995 03/15/1996
61 FR 2931
Winston-Salem Area NC Maintenance 01/06/1992 Moderate <= 12.7ppm 350,670 2019   No Data 4 / 4  
 		 05/02/1994 11/07/1994
59 FR 48399
Worcester Area MA Maintenance 11/15/1990 Not Classified 181,045 2019 0.9 Yes 0 / 0  
 		 05/25/2001 04/22/2002
67 FR 7272
Yakima Area WA Maintenance 11/15/1990 Not Classified 69,565 2019   No Data 1 / 1  
 		 08/23/2001 12/31/2002
67 FR 66555
We have made our best effort to ensure that the data contained in these reports is accurate. We note that there may be brief delays in updating the reports as we receive new state submissions and we take rulemaking action on plans. In order to assist us in providing accurate information, we request that you contact us by clicking on the "Contact Us" link near the top of this page with any comments regarding or corrections to the posted information, including concerns about whether the entries reflect the most recent status.

Current and historical design value data can be found on the EPA Air Quality Design Values website and the EPA Green Book contains comprehensive nonattainment area, designation status, and historical information.

SIP Status Reports