SIP Status Reports

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Status of Iowa Designated Areas

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NOTE: As of 03/12/2021, these reports are no longer being updated.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

Jump to Iowa 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)

Iowa CO (1971) Areas Return to map
No designated areas for this pollutant.
Iowa Lead (1978) Areas Return to map Top of page
No designated areas for this pollutant.
Iowa 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
Pottawattamie County	Maintenance	12/31/2011		12,845	2017-2019	0.08	Yes	6 / 6		09/18/2017	10/04/2018 83 FR 50024
Iowa NO2 (1971) Areas Return to map Top of page
No designated areas for this pollutant.
Iowa Ozone-1Hr (1979) Areas Return to map Top of page
No designated areas for this pollutant.
Iowa Ozone-8Hr (1997) Areas Return to map Top of page
No designated areas for this pollutant.
Iowa Ozone-8Hr (2008) Areas Return to map Top of page
No designated areas for this pollutant.
Iowa Ozone-8Hr (2015) Areas Return to map Top of page
No designated areas for this pollutant.
Iowa PM-10 (1987) Areas Return to map Top of page
No designated areas for this pollutant.
Iowa PM-2.5 (1997) Areas Return to map Top of page
No designated areas for this pollutant.
Iowa PM-2.5 (2006) Areas Return to map Top of page
No designated areas for this pollutant.
Iowa PM-2.5 (2012) Areas Return to map Top of page
No designated areas for this pollutant.
Iowa SO2 (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/24-Hr (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
Muscatine County; (part)	Maintenance	04/11/1994		24,633		/		1 / 1		04/25/1997	05/18/1998 63 FR 13343
Iowa SO2 (2010) 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	3 Year 1-⁠Hour Design Value (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
Muscatine	Nonattainment	10/04/2013		30,329	2017-2019	25	Yes	6 / 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 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.