SIP Status Reports

You are here: EPA Home > Air Quality Implementation Plans > SIP Status Reports > Status of SIP Required Elements for Montana Designated Areas

Status of SIP Required Elements for Montana Designated Areas

Required Elements by NAAQS / Area
As of 09/29/2020

Return to previous page    Return to map

Montana: CO (1971) / Billings Area    
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
CO Nonattainment NSR 11/15/1993 05/23/1994 Approval 09/18/1995 60 FR 36715
Return to previous page    Return to map

Montana: CO (1971) / Great Falls Area   
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
CO Nonattainment NSR 11/15/1993 05/23/1994 Approval 09/18/1995 60 FR 36715
Return to previous page    Return to map

Montana: CO (1971) / Missoula Area   
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
CO contingency measures 11/15/1993 03/09/1994 Approval 02/13/1995 59 FR 64133
CO Emissions Inventory 11/15/1992 07/18/1995 Approval 02/13/1998 62 FR 65613
CO Nonattainment NSR 11/15/1993 05/23/1994 Approval 09/18/1995 60 FR 36715
Oxygenated fuels 11/15/1992 11/06/1992 Approval 12/08/1994  
Return to previous page    Return to map

Montana: Lead (1978) / Lewis & Clark County (part); City of East Helena and vicinity    
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
Lead Nonattainment NSR 07/06/1993 05/23/1994 Approval 09/18/1995 60 FR 36715
Lead SIP 07/06/1993 07/31/1995 Approval 07/18/2001 66 FR 32760
Return to previous page    Return to map

Montana: PM-10 (1987) / Flathead County; Columbia Falls and vicinity    
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
PM-10 contingency measures 11/15/1993 08/26/1994 Approval 05/20/1996 61 FR 11153
PM-10 Nonattainment NSR 06/30/1992 05/23/1994 Approval 09/18/1995 60 FR 36715
PM-10 SIP 11/15/1991 05/12/1992 Approval 05/16/1994 59 FR 17700
Return to previous page    Return to map

Montana: PM-10 (1987) / Flathead County; Kalispell and vicinity   
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
PM-10 contingency measures 11/15/1993 07/18/1995 Approval 05/20/1996 61 FR 11153
PM-10 Nonattainment NSR 06/30/1992 05/23/1994 Approval 09/18/1995 60 FR 36715
PM-10 SIP 11/15/1991 12/04/1991 Approval 05/20/1996 61 FR 11153
Return to previous page    Return to map

Montana: PM-10 (1987) / Flathead County; Whitefish and vicinity   
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
PM-10 contingency measures 05/18/1995 06/27/1997 Approval 02/28/1999  
PM-10 Nonattainment NSR 05/18/1995 05/23/1994 Approval 09/18/1995 60 FR 36715
PM-10 SIP 05/18/1995 06/26/1997 Approval 06/23/2008 73 FR 22057
Return to previous page    Return to map

Montana: PM-10 (1987) / Lake County; Polson   
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
PM-10 contingency measures 11/15/1993        
PM-10 Nonattainment NSR 06/30/1992        
PM-10 SIP 11/15/1991        
Return to previous page    Return to map

Montana: PM-10 (1987) / Lake County; Ronan   
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
PM-10 contingency measures 11/15/1993        
PM-10 Nonattainment NSR 06/30/1992        
PM-10 SIP 11/15/1991        
Return to previous page    Return to map

Montana: PM-10 (1987) / Lincoln County; Libby and vicinity   
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
PM-10 contingency measures 11/15/1993 05/24/1993 Approval 11/29/1996 61 FR 51014
PM-10 Nonattainment NSR 06/30/1992 05/23/1994 Approval 09/18/1995 60 FR 36715
PM-10 SIP 11/15/1991 12/04/1991 Approval 10/31/1994 59 FR 44627
Return to previous page    Return to map

Montana: PM-10 (1987) / Missoula county; Missoula and vicinity   
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
PM-10 contingency measures 11/15/1993 03/02/1994 Approval 02/13/1995 59 FR 64133
PM-10 Nonattainment NSR 06/30/1992 05/23/1994 Approval 09/18/1995 60 FR 36715
PM-10 SIP 11/15/1991 06/11/1992 Approval 02/17/1994 59 FR 2537
Return to previous page    Return to map

Montana: PM-10 (1987) / Rosebud County; Lame Deer   
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
PM-10 contingency measures 11/15/1993        
PM-10 Nonattainment NSR 06/30/1992        
PM-10 SIP 11/15/1991        
Return to previous page    Return to map

Montana: PM-10 (1987) / Sanders County (part); Thompson Falls and vicinity   
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
PM-10 contingency measures 07/20/1995 06/26/1997 Approval 02/28/1999  
PM-10 Nonattainment NSR 07/20/1995 05/23/1994 Approval 09/18/1995 60 FR 36715
PM-10 SIP 07/20/1995 06/26/1997 Approval 02/23/2004 69 FR 3011
Return to previous page    Return to map

Montana: PM-10 (1987) / Silver Bow County; Butte   
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
PM-10 contingency measures 11/15/1993 08/26/1994 Approval 05/22/1995 60 FR 15056
PM-10 Nonattainment NSR 06/30/1992 05/23/1994 Approval 09/18/1995 60 FR 36715
PM-10 SIP 11/15/1991 07/17/1992 Approval 04/11/1994 59 FR 11550
Return to previous page    Return to map

Montana: PM-2.5 (1997) / Libby    
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
Emission Inventory (Moderate) 04/05/2008 04/03/2008 Approval 04/18/2011 76 FR 14584
RACM/RACT (Subpart 1) (Moderate) 04/05/2008 04/03/2008 Approval 04/18/2011 76 FR 14584
RACM/RACT (Subpart 4) (Moderate) 12/31/2014   Clean Data Determination 08/13/2015 80 FR 40911
Attainment Demonstration (Moderate) 04/05/2008 04/03/2008 Approval 04/18/2011 76 FR 14584
RFP (Moderate) 12/31/2014   Clean Data Determination 08/13/2015 80 FR 40911
Quantitative Milestones (Moderate) 12/31/2014   Clean Data Determination 08/13/2015 80 FR 40911
Contingency Measures (Moderate) 04/05/2008 04/03/2008 Approval 04/18/2011 76 FR 14584
Nonattainment NSR (Moderate) 12/31/2014        
Return to previous page    Return to map

Montana: SO2 (1971) / East Helena Area    
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
SO2 SIP - primary standard 05/15/1992 03/30/1994 Approval 03/28/1995  
SO2 SIP - secondary standard 11/15/1993 10/26/2018 Approval 10/11/2019 84 FR 47897
Return to previous page    Return to map

Montana: SO2 (1971) / Laurel Area   
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
SO2 Nonattainment NSR 11/15/1993 05/23/1994 Approval 09/18/1995 60 FR 36715
Return to previous page    Return to map

Montana: SO2 (2010) / Billings    
 
SIP Requirement Deadline Submittal Date Latest Action Date of Latest Action FR Citation
Click to view
FR notice
SO2 Attainment Demonstration 04/06/2015   Approval 06/09/2016 81 FR 28718
SO2 Contingency Measures 04/06/2015   Approval 06/09/2016 81 FR 28718
Emission Inventory 04/06/2015   Approval 06/09/2016 81 FR 28718
SO2 Nonattainment NSR 04/06/2015   Redesignation approved 06/09/2016 81 FR 28718
SO2 RACM/RACT 04/06/2015   Approval 06/09/2016 81 FR 28718
SO2 RFP 04/06/2015   Approval 06/09/2016 81 FR 28718
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.