SIP Status Reports

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Status of California Designated Areas

California Areas by NAAQS
As of 08/21/2019

Jump to California section for: CO (1971) Lead (1978) Lead (2008) NO2 (1971) Ozone-1Hr (1979) Ozone-8Hr (1997) Ozone-8Hr (2008) Ozone-8Hr (2015) PM-10 (1987) PM-2.5 (1997) PM-2.5 (2006) PM-2.5 (2012) SO2 (1971) SO2 (2010)


California CO (1971) Areas    Return to map
 
Click on the Area name
to view SIP Required Elements


Area
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
Bakersfield Area Maintenance 11/15/1990 Not Classified 468,092 2018 1.1 Yes 1 / 0 06/01/1998
63 FR 15305
07/03/1996 06/01/1998
63 FR 15305
Chico Area Maintenance 11/15/1990 Moderate <= 12.7ppm 86,963 2018 6.4 Yes 4 / 3 06/01/1998
63 FR 15305
07/03/1996 06/01/1998
63 FR 15305
Fresno Area Maintenance 11/15/1990 Moderate > 12.7ppm 631,483 2018 1.8 Yes 6 / 5 06/01/1998
63 FR 15305
07/03/1996 06/01/1998
63 FR 15305
Lake Tahoe North Shore Area Maintenance 11/15/1990 Not Classified 16,132 2018   No Data 0 / 0 06/01/1998
63 FR 15305
07/03/1996 06/01/1998
63 FR 15305
Lake Tahoe South Shore Area Maintenance 11/15/1990 Moderate <= 12.7ppm 43,110 2018   No Data 4 / 3 06/01/1998
63 FR 15305
07/03/1996 06/01/1998
63 FR 15305
Los Angeles-South Coast Air Basin Area Maintenance 11/15/1990 Serious 15,799,134 2018 3.1 Yes 7 / 7 06/11/2007
72 FR 26718
02/24/2006 06/11/2007
72 FR 26718
Modesto Area Maintenance 11/15/1990 Moderate <= 12.7ppm 320,707 2018 1.9 Yes 4 / 3 06/01/1998
63 FR 15305
07/03/1996 06/01/1998
63 FR 15305
Sacramento Area Maintenance 11/15/1990 Moderate <= 12.7ppm 1,530,116 2018 3.6 Yes 4 / 3 06/01/1998
63 FR 15305
07/03/1996 06/01/1998
63 FR 15305
San Diego Area Maintenance 11/15/1990 Moderate <= 12.7ppm 2,909,194 2018 1.3 Yes 4 / 3 06/01/1998
63 FR 15305
07/03/1996 06/01/1998
63 FR 15305
San Francisco-Oakland-San Jose Area Maintenance 11/15/1990 Moderate <= 12.7ppm 4,296,499 2018 3 Yes 4 / 3 06/01/1998
63 FR 15305
07/03/1996 06/01/1998
63 FR 15305
Stockton Area Maintenance 11/15/1990 Moderate <= 12.7ppm 373,545 2018 2.4 Yes 4 / 3 06/01/1998
63 FR 15305
07/03/1996 06/01/1998
63 FR 15305

California Lead (1978) Areas     Return to map Top of page

No designated areas for this pollutant.

California Lead (2008) Areas    Return to map     Top of page

Click on the Area name
to view SIP Required Elements


Area
Status Designation
Date
Classification 2010
Population
(state portion)
Meets NAAQS
Basis
Design Value
Annual
(µg/m3)
(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
Los Angeles County-South Coast Air Basin Nonattainment 12/31/2010   9,436,927 2016-2018 0.02 Yes 6 / 6  
 
   

California NO2 (1971) Areas    Return to map     Top of page

Click on the Area name
to view SIP Required Elements


Area
Status Designation
Date
Classification 2010
Population
(state portion)
Meets NAAQS
Basis
Design Value
Annual
(ppb)
(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
Los Angeles-South Coast Air Basin Area Maintenance 11/15/1990   15,799,134 2018 30 Yes 0 / 0 09/22/1998
63 FR 39747
02/05/1997 09/22/1998
63 FR 39747

California Ozone-1Hr (1979) Areas    Return to map     Top of page

Click on the Area name
to view SIP Required Elements


Area
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
East Kern County Area Maintenance (NAAQS revoked) 12/10/2001 Serious 141,398 2016-2018 0.103 Yes 27 / 26 06/21/2004
69 FR 21731
  06/21/2004
69 FR 21731
Los Angeles-South Coast Air Basin Area Nonattainment (NAAQS revoked) 11/15/1990 Extreme 15,798,191 2016-2018 0.149 No 42 / 38  
 
   
Monterey Bay Area Maintenance (NAAQS revoked) 11/15/1990 Moderate 732,708 2016-2018 0.087 Yes 20 / 11 02/16/2010
74 FR 66916
07/14/1994 03/18/1997
62 FR 2597
Morongo Band of Mission Indians Nonattainment (NAAQS revoked) 11/15/1990 Severe-17 913 2016-2018 0.128 No 0 / 0  
 
   
Sacramento Metro Area Nonattainment (NAAQS revoked) 11/15/1990 Severe-15 2,336,542 2016-2018 0.114 Yes 71 / 47 11/19/2012
77 FR 64036
   
San Diego Area Maintenance (NAAQS revoked) 11/15/1990 Serious 3,095,313 2016-2018 0.104 Yes 33 / 33 07/28/2003
68 FR 37976
12/20/2002 07/28/2003
68 FR 37976
San Francisco-Bay Area Nonattainment (NAAQS revoked) 07/10/1998 Other 6,896,958 2016-2018 0.102 Yes 26 / 23 05/24/2004
69 FR 21717
   
San Joaquin Valley Area Nonattainment (NAAQS revoked) 11/15/1990 Extreme 3,830,257 2016-2018 0.119 Yes 36 / 30 08/17/2016
81 FR 46608
   
Santa Barbara-Santa Maria-Lompoc Area Maintenance (NAAQS revoked) 11/15/1990 Serious 423,895 2016-2018 0.078 Yes 22 / 22 08/08/2003
68 FR 40789
02/21/2003 08/08/2003
68 FR 40789
Southeast Desert Modified AQMA Area Nonattainment (NAAQS revoked) 11/15/1990 Severe-17 1,194,366 2016-2018 0.132 No 42 / 27 05/15/2015
 
   
Ventura County Area Nonattainment (NAAQS revoked) 11/15/1990 Severe-15 823,318 2016-2018 0.101 Yes 29 / 23 07/27/2009
74 FR 25153
   

California Ozone-8Hr (1997) Areas    Return to map     Top of page

Click on the Area name
to view SIP Required Elements


Area
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
Amador and Calaveras Cos. (Central Mountain Cos.) Nonattainment (NAAQS revoked) 06/15/2004 Subpart 2/Moderate 83,669 2016-2018 0.077 Yes 52 / 0 01/02/2013
77 FR 71551
   
Chico Nonattainment (NAAQS revoked) 06/15/2004 Subpart 2/Marginal 220,000 2016-2018 0.079 Yes 3 / 0 01/02/2013
77 FR 71551
   
Imperial County Area Nonattainment (NAAQS revoked) 06/15/2004 Subpart 2/Moderate 174,528 2016-2018 0.077 Yes 53 / 47 12/22/2014
79 FR 63332
   
Kern County (Eastern Kern) Nonattainment (NAAQS revoked) 06/15/2004 Subpart 2/Moderate 95,314 2016-2018 0.085 No 52 / 0 01/02/2013
77 FR 71551
   
Los Angeles and San Bernardino Counties (Western Mojave Desert) Nonattainment (NAAQS revoked) 06/15/2004 Subpart 2/Severe 15 868,350 2016-2018 0.098 No 108 / 60  
 
   
Los Angeles-South Coast Air Basin Area Nonattainment (NAAQS revoked) 06/15/2004 Subpart 2/Extreme 15,715,184 2016-2018 0.111 No 61 / 46  
 
   
Mariposa and Tuolumne Cos. (Southern Mountain Counties) Nonattainment (NAAQS revoked) 06/15/2004 Subpart 2/Moderate 73,616 2016-2018 0.083 Yes 52 / 0 01/02/2013
77 FR 71551
   
Morongo Band of Mission Indians Nonattainment (NAAQS revoked) 06/15/2004 Subpart 2/Severe 17 913 2016-2018 0.101 No 57 / 0  
 
   
Nevada County (Western part) Nonattainment (NAAQS revoked) 06/15/2004 Subpart 2/Moderate 82,393 2016-2018 0.090 No 52 / 46 01/02/2013
77 FR 71551
   
Pechanga Band of Luiseņo Mission Indians of the Pechanga Reservation Maintenance (NAAQS revoked) 06/15/2004 Subpart 2/Severe 17 2,844 2016-2018 0.080 Yes 57 / 0 04/03/2015
80 FR 18120
  04/03/2015
80 FR 18120
Riverside County (Coachella Valley) Area Nonattainment (NAAQS revoked) 06/15/2004 Subpart 2/Extreme 425,425 2016-2018 0.091 No 60 / 43  
 
   
Sacramento Metro Area Nonattainment (NAAQS revoked) 06/15/2004 Subpart 2/Severe 15 2,243,911 2016-2018 0.088 No 256 / 172  
 
   
San Diego Maintenance (NAAQS revoked) 06/15/2004 Subpart 2/Moderate 3,093,345 2016-2018 0.084 Yes 53 / 1 07/05/2013
78 FR 33230
12/28/2012 07/05/2013
78 FR 33230
San Francisco Bay Area Nonattainment (NAAQS revoked) 06/15/2004 Subpart 2/Marginal 6,970,997 2016-2018 0.073 Yes 3 / 0  
 
   
San Joaquin Valley Area Nonattainment (NAAQS revoked) 06/15/2004 Subpart 2/Extreme 3,842,586 2016-2018 0.090 No 61 / 58  
 
   
Sutter County (part) (Sutter Buttes) Nonattainment (NAAQS revoked) 06/15/2004 Subpart 2/Marginal 33 2016-2018   Insufficient Data 3 / 0 01/02/2013
77 FR 71551
   
Ventura County (part) Area Nonattainment (NAAQS revoked) 06/15/2004 Subpart 2/Serious 823,360 2016-2018 0.078 Yes 59 / 39 01/02/2013
77 FR 71551
   

California Ozone-8Hr (2008) Areas    Return to map     Top of page

Click on the Area name
to view SIP Required Elements


Area
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
Calaveras County Nonattainment 07/20/2012 Marginal 45,578 2016-2018 0.077 No 3 / 1 06/03/2016
81 FR 26697
   
Chico (Butte County) Nonattainment 07/20/2012 Marginal 220,000 2016-2018 0.079 No 3 / 2 06/03/2016
81 FR 26697
   
Imperial County Nonattainment 07/20/2012 Moderate 174,528 2016-2018 0.077 No 54 / 2  
 
   
Kern County (Eastern Kern) Nonattainment 07/20/2012 Serious 95,176 2016-2018 0.085 No 56 / 0  
 
   
Los Angeles-San Bernardino Counties (West Mojave Desert) Nonattainment 07/20/2012 Severe 15 868,380 2016-2018 0.098 No 107 / 75  
 
   
Los Angeles-South Coast Air Basin Nonattainment 07/20/2012 Extreme 15,719,485 2016-2018 0.111 No 59 / 47  
 
   
Mariposa County Nonattainment 07/20/2012 Moderate 18,251 2016-2018 0.079 No 54 / 0 03/21/2017
81 FR 93624
   
Morongo Band of Mission Indians Nonattainment 07/20/2012 Serious 913 2016-2018 0.101 No 53 / 0  
 
   
Nevada County (Western part) Nonattainment 07/20/2012 Moderate 82,107 2016-2018 0.090 No 54 / 0  
 
   
Pechanga Band of Luiseņo Mission Indians of the Pechanga Reservation Nonattainment 07/20/2012 Moderate 2,844 2016-2018 0.080 No 53 / 0  
 
   
Riverside County (Coachella Valley) Nonattainment 07/20/2012 Severe 15 425,806 2016-2018 0.091 No 58 / 47  
 
   
Sacramento Metro Nonattainment 07/20/2012 Severe 15 2,241,057 2016-2018 0.088 No 254 / 175  
 
   
San Diego County Nonattainment 07/20/2012 Moderate 3,095,199 2016-2018 0.084 No 55 / 2  
 
   
San Francisco Bay Area Nonattainment 07/20/2012 Marginal 6,973,020 2016-2018 0.073 Yes 3 / 2 06/03/2016
81 FR 26697
   
San Joaquin Valley Nonattainment 07/20/2012 Extreme 3,842,365 2016-2018 0.090 No 59 / 57  
 
   
San Luis Obispo (Eastern San Luis Obispo) Nonattainment 07/20/2012 Marginal 1,649 2016-2018 0.072 Yes 3 / 1 01/20/2017
81 FR 93620
   
Tuscan Buttes Nonattainment 07/20/2012 Marginal 0 2016-2018 0.081 No 3 / 0 06/03/2016
81 FR 26697
   
Ventura County Nonattainment 07/20/2012 Serious 823,262 2016-2018 0.078 No 54 / 46  
 
   

California Ozone-8Hr (2015) Areas    Return to map     Top of page

Click on the Area name
to view SIP Required Elements


Area
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
Amador County Nonattainment 08/03/2018 Marginal 38,091 2016-2018 0.072 No 3 / 0  
 
   
Butte County Nonattainment 08/03/2018 Marginal 220,000 2016-2018 0.079 No 3 / 0  
 
   
Calaveras County Nonattainment 08/03/2018 Marginal 45,578 2016-2018 0.077 No 3 / 0  
 
   
Imperial County Nonattainment 08/03/2018 Marginal 174,528 2016-2018 0.077 No 3 / 0  
 
   
Kern County (Eastern Kern) Nonattainment 08/03/2018 Moderate 95,066 2016-2018 0.085 No 53 / 0  
 
   
Los Angeles-San Bernardino Counties (West Mojave Desert) Nonattainment 08/03/2018 Severe-15 866,960 2016-2018 0.098 No 107 / 0  
 
   
Los Angeles-South Coast Air Basin Nonattainment 08/03/2018 Extreme 15,702,771 2016-2018 0.111 No 59 / 0  
 
   
Mariposa County Nonattainment 08/03/2018 Marginal 18,251 2016-2018 0.079 No 3 / 0  
 
   
Morongo Band of Mission Indians Nonattainment 08/03/2018 Serious 932 2016-2018 0.101 No 54 / 0  
 
   
Nevada County (Western part) Nonattainment 08/03/2018 Moderate 82,042 2016-2018 0.090 No 53 / 0  
 
   
Pechanga Band of Luiseņo Mission Indians of the Pechanga Reservation Nonattainment 08/03/2018 Marginal 652 2016-2018 0.080 No 3 / 0  
 
   
Riverside County (Coachella Valley) Nonattainment 08/03/2018 Severe-15 425,029 2016-2018 0.091 No 58 / 0  
 
   
Sacramento Metro Nonattainment 08/03/2018 Moderate 2,240,448 2016-2018 0.088 No 246 / 0  
 
   
San Diego County Nonattainment 08/03/2018 Moderate 3,077,287 2016-2018 0.084 No 54 / 0  
 
   
San Francisco Bay Area Nonattainment 08/03/2018 Marginal 6,969,365 2016-2018 0.073 No 3 / 0  
 
   
San Joaquin Valley Nonattainment 08/03/2018 Extreme 3,841,897 2016-2018 0.090 No 59 / 0  
 
   
San Luis Obispo (Eastern part) Nonattainment 08/03/2018 Marginal 1,290 2016-2018 0.072 No 3 / 0  
 
   
Sutter Buttes Nonattainment 08/03/2018 Marginal 3 2016-2018 0.073 No 3 / 0  
 
   
Tuolumne County Nonattainment 08/03/2018 Marginal 55,365 2016-2018 0.083 No 3 / 0  
 
   
Tuscan Buttes Nonattainment 08/03/2018 Marginal (Rural Transport) 0 2016-2018 0.081 No 3 / 0  
 
   
Ventura County Nonattainment 08/03/2018 Serious 820,808 2016-2018 0.078 No 55 / 0  
 
   

California PM-10 (1987) Areas    Return to map     Top of page

Click on the Area name
to view SIP Required Elements


Area
Status Designation
Date
Classification 2010
Population
(state portion)
Meets NAAQS
Basis
Average
Estimated
Exceedances
(est. exc.)
(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
Coso Junction Maintenance 11/15/1990 Moderate 7,333 2016-2018 1.4 No 3 / 0 06/18/2010
75 FR 27944
07/14/2010 10/04/2010
75 FR 54031
East Kern County Area Nonattainment 11/15/1990 Serious 125,950 2016-2018   Insufficient Data 4 / 3  
 
   
Imperial County; Imperial Valley planning area Nonattainment 11/15/1990 Serious 146,905 2016-2018 14.3 No 4 / 1  
 
   
Indian Wells Maintenance 11/15/1990 Moderate 15,449 2016-2018 0 Yes 3 / 2 06/06/2003
68 FR 24368
  06/06/2003
68 FR 24368
Inyo County; Owens Valley planning area Nonattainment 11/15/1990 Serious 7,333 2016-2018 7.4 No 4 / 3  
 
   
Mono County; Mammoth Lake planning area Maintenance 11/15/1990 Moderate 7,133 2016-2018 1.1 No 3 / 2 11/04/2015
80 FR 60049
09/11/1991 11/04/2015
80 FR 60049
Mono County; Mono Basin Nonattainment 12/29/1993 Moderate 285 2016-2018 21.3 No 3 / 0  
 
   
Riverside County; Coachella Valley planning area Nonattainment 11/15/1990 Serious 257,794 2016-2018 7.2 No 3 / 2  
 
03/29/2010  
Riverside, Los Angeles, Orange, and San Bernardino Counties; South Coast Air Basin Maintenance 11/15/1990 Serious 15,799,134 2016-2018 2 No 3 / 3 07/26/2013
78 FR 38223
04/28/2010 07/26/2013
78 FR 38223
Sacramento County Maintenance 01/20/1994 Moderate 1,418,788 2016-2018 4.1 No 3 / 0 03/18/2002
67 FR 7082
  10/28/2013
78 FR 59261
San Bernardino County (part); excluding Searles Valley Planning area and South Coast Air Basin Nonattainment 01/20/1994 Moderate 237,418 2016-2018 1.3 No 3 / 0 03/18/2002
67 FR 7082
   
San Joaquin Valley Air Basin; Fresno, Kern, Kings, Madera, Merced, San Joaquin, Stanislaus, Tulare Counties Maintenance 11/15/1990 Serious 3,830,257 2016-2018 5.3 No 3 / 3 12/12/2008
73 FR 66759
08/19/2003 12/12/2008
73 FR 66759
Trona Nonattainment 11/15/1990 Moderate 4,167 2016-2018   Insufficient Data 3 / 0 09/05/2002
67 FR 50805
   

California PM-2.5 (1997) Areas    Return to map     Top of page

Click on the Area name
to view SIP Required Elements


Area
Status Designation
Date
Classification 2010
Population
(state portion)
Meets NAAQS
Basis
Design Value
Annual
(µg/m3)
(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
Los Angeles-South Coast Air Basin Nonattainment 04/05/2005 Moderate 15,716,335 2016-2018 14.7 Yes 8 / 6 08/24/2016
81 FR 48350
   
San Joaquin Valley Nonattainment 04/05/2005 Serious 3,842,165 2016-2018 17.8 No 22 / 8  
 
   

California PM-2.5 (2006) Areas    Return to map
Area designated nonattainment for the 24-hour standard     Top of page

Click on the Area name
to view SIP Required Elements


Area
Status Designation
Date
Classification 2010
Population
(state portion)
Meets NAAQS
Basis
Design Value
24-Hr
(µg/m3)
(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
Chico Maintenance 12/14/2009 Moderate 217,626 2016-2018 38 No 7 / 2 06/09/2017
82 FR 21711
12/18/2017 08/10/2018
83 FR 32064
Imperial County Nonattainment 12/14/2009 Moderate 154,061 2016-2018 35 Yes 7 / 2 06/09/2017
82 FR 21711
   
Los Angeles-South Coast Air Basin Nonattainment 12/14/2009 Serious 15,716,242 2016-2018 38 No 15 / 12  
 
   
Sacramento Nonattainment 12/14/2009 Moderate 2,206,060 2016-2018 50 No 10 / 2 06/09/2017
82 FR 21711
   
San Francisco Bay Area Nonattainment 12/14/2009 Moderate 6,971,067 2016-2018 48 No 7 / 2 06/09/2017
82 FR 21711
   
San Joaquin Valley Nonattainment 12/14/2009 Serious 3,842,165 2016-2018 65 No 15 / 6  
 
   
Yuba City-Marysville Maintenance 12/14/2009 Moderate 164,955 2016-2018 30 Yes 6 / 5 02/11/2013
78 FR 2211
05/23/2013 01/08/2015
79 FR 72981

California PM-2.5 (2012) Areas    Return to map     Top of page

Click on the Area name
to view SIP Required Elements


Area
Status Designation
Date
Classification 2010
Population
(state portion)
Meets NAAQS
Basis
Design Value
Annual
(µg/m3)
(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
Imperial County Nonattainment 04/15/2015 Moderate 154,061 2016-2018 12.6 No 7 / 1  
 
   
Los Angeles-South Coast Air Basin Nonattainment 04/15/2015 Moderate 15,716,242 2016-2018 14.7 No 7 / 1  
 
   
Plumas County Nonattainment 04/15/2015 Moderate 5,843 2016-2018 14.7 No 7 / 5  
 
   
San Joaquin Valley Nonattainment 04/15/2015 Moderate 3,842,165 2016-2018 17.8 No 7 / 0  
 
   

California SO2 (1971) Areas     Return to map Top of page

No designated areas for this pollutant.

California SO2 (2010) Areas     Return to map Top of page

No designated areas for this pollutant.
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.

The level of the 1-hour NAAQS for sulfur dioxide is 75 parts per billion (ppb) calculated as the 3-year average of the 99th percentile of the annual distribution of daily maximum 1-hour average concentrations.