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Status of SIP Requirements for Designated Areas

Montana Areas by Pollutant
As of 10/19/2014
View Nonattainment Contacts


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


Montana CO (1971) Areas    Return to map
 
Click on the Area name
to view SIP Requirements


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
Effective Date
Citation
(link to GPO website)
Redesignation
Request Date
Redesignation
Effective Date
Citation
(link to GPO website)
Billings Area Maintenance 11/15/1990 Not Classified 104,360       1 / 1 04/22/2002
67 FR 7966
02/09/2001 04/22/2002
67 FR 7966
Great Falls Area Maintenance 11/15/1990 Not Classified 57,573       1 / 1 07/08/2002
67 FR 31143
02/09/2001 07/08/2002
67 FR 31143
Missoula Area Maintenance 11/15/1990 Moderate <= 12.7ppm 59,733       4 / 4 09/17/2007
72 FR 46158
05/27/2005 09/17/2007
72 FR 46158

Montana Lead (1978) Areas    Return to map    

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Click on the Area name
to view SIP Requirements


Area
Status Designation
Date
Classification 2010
Population
(state portion)
Meets NAAQS
Basis
Design Value
Annual
(g/m)
(entire area)
Meets
NAAQS
SIP
Requirements
Original/Approved
Clean Air
Determination
Effective Date
Citation
(link to GPO website)
Redesignation
Request Date
Redesignation
Effective Date
Citation
(link to GPO website)
Lewis & Clark County (part); City of East Helena and vicinity Nonattainment 01/06/1992   2,669 2009-2010   No Data 2 / 2  
 
   
 

Montana Lead (2008) Areas    Return to map    

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No designated areas for this pollutant.

Montana NO2 (1971) Areas    Return to map    

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No designated areas for this pollutant.

Montana Ozone-1Hr (1979) Areas    Return to map    

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No designated areas for this pollutant.

Montana Ozone-8Hr (1997) Areas    Return to map    

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No designated areas for this pollutant.

Montana Ozone-8Hr (2008) Areas    Return to map    

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No designated areas for this pollutant.

Montana PM-10 (1987) Areas    Return to map    

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Click on the Area name
to view SIP Requirements


Area
Status Designation
Date
Classification 2010
Population
(state portion)
Meets NAAQS
Basis
Design Value
(entire area)
Meets
NAAQS
SIP
Requirements
Original/Approved
Clean Air
Determination
Effective Date
Citation
(link to GPO website)
Redesignation
Request Date
Redesignation
Effective Date
Citation
(link to GPO website)
Flathead County; Columbia Falls and vicinity Nonattainment 11/15/1990 Moderate 4,610 2011-2013   Insufficient Data 3 / 3 04/01/2011
76 FR 5280
   
 
Flathead County; Kalispell and vicinity Nonattainment 11/15/1990 Moderate 18,422 2011-2013   Insufficient Data 3 / 3  
 
   
 
Flathead County; Whitefish and vicinity Nonattainment 11/18/1993 Moderate 6,138 2011-2013   Insufficient Data 3 / 3  
 
   
 
Lake County; Polson Nonattainment 11/15/1990 Moderate 4,099 2011-2013   Insufficient Data 3 / 0  
 
   
 
Lake County; Ronan Nonattainment 11/15/1990 Moderate 2,734 2011-2013   Insufficient Data 3 / 0  
 
   
 
Lincoln County; Libby and vicinity Nonattainment 11/15/1990 Moderate 3,378 2011-2013   Insufficient Data 3 / 3 04/01/2011
76 FR 5280
   
 
Missoula county; Missoula and vicinity Nonattainment 11/15/1990 Moderate 59,733 2011-2013   Yes 3 / 3  
 
   
 
Rosebud County; Lame Deer Nonattainment 11/15/1990 Moderate 527 2011-2013   Insufficient Data 3 / 0  
 
   
 
Sanders County (part); Thompson Falls and vicinity Nonattainment 01/20/1994 Moderate 1,317 2011-2013   Insufficient Data 3 / 3  
 
   
 
Silver Bow County; Butte Nonattainment 11/15/1990 Moderate 34,201 2011-2013   Yes 3 / 3  
 
   
 

Montana PM-2.5 (1997) Areas    Return to map    

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Click on the Area name
to view SIP Requirements


Area
Status Designation
Date
Classification 2010
Population
(state portion)
Meets NAAQS
Basis
Design Value
Annual
(g/m)
(entire area)
Meets
NAAQS
SIP
Requirements
Original/Approved
Clean Air
Determination
Effective Date
Citation
(link to GPO website)
Redesignation
Request Date
Redesignation
Effective Date
Citation
(link to GPO website)
Libby Nonattainment 04/05/2005 Moderate 9,429 2011-2013 11.4 Yes 6 / 4  
 
   
 

Montana PM-2.5 (2006) Areas    Return to map    

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No designated areas for this pollutant.

Montana SO2 (1971) Areas    Return to map    

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Click on the Area name
to view SIP Requirements


Area
Status Designation
Date
Classification 2010
Population
(state portion)
Meets NAAQS
Basis
Design Value
Annual/24-Hr
(ppb)
(entire area)
Meets
NAAQS
SIP
Requirements
Original/Approved
Clean Air
Determination
Effective Date
Citation
(link to GPO website)
Redesignation
Request Date
Redesignation
Effective Date
Citation
(link to GPO website)
East Helena Area Nonattainment 11/15/1990   2,669 2012-2013   /   No Data 2 / 1  
 
   
 
Laurel Area Nonattainment 11/15/1990   6,525 2012-2013   /   No Data 1 / 1  
 
   
 

Montana SO2 (2010) Areas    Return to map    

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Click on the Area name
to view SIP Requirements


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
Effective Date
Citation
(link to GPO website)
Redesignation
Request Date
Redesignation
Effective Date
Citation
(link to GPO website)
Billings Nonattainment 10/04/2013   2,621 2011-2013 64 Yes 1 / 0  
 
   
 
 
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 Trends website and the EPA Green Book contains comprehensive nonattainment area, designation status, and historical information.

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