SIP Status Reports

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Status of SIP Required Elements for Montana Designated Areas

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NOTE: As of 03/12/2021, these reports are no longer being updated.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

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 (Moderate)	11/15/1993	08/26/1994	Approval	05/20/1996	61 FR 11153
PM-10 Nonattainment NSR (Moderate)	06/30/1992	05/23/1994	Approval	09/18/1995	60 FR 36715
PM-10 SIP (Moderate)	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 (Moderate)	11/15/1993	07/18/1995	Approval	05/20/1996	61 FR 11153
PM-10 Nonattainment NSR (Moderate)	06/30/1992	05/23/1994	Approval	09/18/1995	60 FR 36715
PM-10 SIP (Moderate)	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 (Moderate)	05/18/1995	06/27/1997	Approval	02/28/1999
PM-10 Nonattainment NSR (Moderate)	05/18/1995	05/23/1994	Approval	09/18/1995	60 FR 36715
PM-10 SIP (Moderate)	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 (Moderate)	11/15/1993
PM-10 Nonattainment NSR (Moderate)	06/30/1992
PM-10 SIP (Moderate)	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 (Moderate)	11/15/1993
PM-10 Nonattainment NSR (Moderate)	06/30/1992
PM-10 SIP (Moderate)	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 (Moderate)	11/15/1993	05/24/1993	Approval	11/29/1996	61 FR 51014
PM-10 Nonattainment NSR (Moderate)	06/30/1992	05/23/1994	Approval	09/18/1995	60 FR 36715
PM-10 SIP (Moderate)	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 (Moderate)	11/15/1993	03/02/1994	Approval	02/13/1995	59 FR 64133
PM-10 Nonattainment NSR (Moderate)	06/30/1992	05/23/1994	Approval	09/18/1995	60 FR 36715
PM-10 SIP (Moderate)	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 (Moderate)	11/15/1993
PM-10 Nonattainment NSR (Moderate)	06/30/1992
PM-10 SIP (Moderate)	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 (Moderate)	07/20/1995	06/26/1997	Approval	02/28/1999
PM-10 Nonattainment NSR (Moderate)	07/20/1995	05/23/1994	Approval	09/18/1995	60 FR 36715
PM-10 SIP (Moderate)	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 (Moderate)	11/15/1993	08/26/1994	Approval	05/22/1995	60 FR 15056
PM-10 Nonattainment NSR (Moderate)	06/30/1992	05/23/1994	Approval	09/18/1995	60 FR 36715
PM-10 SIP (Moderate)	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		Redesignation approved	06/09/2016	81 FR 28718
SO2 Contingency Measures	04/06/2015		Redesignation approved	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		Redesignation approved	06/09/2016	81 FR 28718
SO2 RFP	04/06/2015		Redesignation approved	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.