SIP Status Reports

You are here: EPA Home > Air Quality Implementation Plans > SIP Status Reports > Status of Delaware Designated Areas

Status of Delaware Designated Areas

Delaware 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NOTE: As of 03/12/2021, these reports are no longer being updated.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 Delaware 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)

Delaware CO (1971) Areas Return to map
No designated areas for this pollutant.
Delaware Lead (1978) Areas Return to map Top of page
No designated areas for this pollutant.
Delaware Lead (2008) Areas Return to map Top of page
No designated areas for this pollutant.
Delaware NO2 (1971) Areas Return to map Top of page
No designated areas for this pollutant.
Delaware 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
Philadelphia-Wilmington-Trenton Area	Nonattainment (NAAQS revoked)	11/15/1990	Severe-15	700,789	2017-2019	0.102	Yes	30 / 29	08/25/2008 73 FR 43360
Sussex County Area	Nonattainment (NAAQS revoked)	01/06/1992	Marginal	197,145	2017-2019	0.075	Yes	8 / 8	03/20/1995 60 FR 3349
OTR 1990								5 / 5
OTR								13 / 13
Delaware 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
Philadelphia-Wilmington-Atlantic City Area	Nonattainment (NAAQS revoked)	06/15/2004	Subpart 2/Moderate	897,934	2017-2019	0.076	Yes	53 / 53	04/25/2012 77 FR 17341
OTR								46 / 46
Delaware 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
Philadelphia-Wilmington-Atlantic City	Nonattainment	07/20/2012	Marginal	538,479	2017-2019	0.076	No	3 / 2	12/04/2017 82 FR 50814
Seaford	Nonattainment	07/20/2012	Marginal	197,145	2017-2019	0.065	Yes	3 / 2	06/03/2016 81 FR 26697
OTR								47 / 47
Delaware 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
Philadelphia-Wilmington-Atlantic City	Nonattainment	08/03/2018	Marginal	538,479	2017-2019	0.076	No	3 / 0
OTR								46 / 0
Delaware PM-10 (1987) Areas Return to map Top of page
No designated areas for this pollutant.
Delaware 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
Philadelphia-Wilmington	Maintenance (NAAQS revoked)	04/05/2005	Moderate	538,479	2017-2019	10.7	Yes	6 / 5	06/15/2012 77 FR 28782	12/14/2012	09/04/2014 79 FR 45350
Delaware 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
Philadelphia-Wilmington	Maintenance	12/14/2009	Moderate	538,479	2017-2019	27	Yes	6 / 2	01/07/2013 78 FR 882	12/14/2012	09/04/2014 79 FR 45350
Delaware PM-2.5 (2012) Areas Return to map Top of page
No designated areas for this pollutant.
Delaware SO2 (1971) Areas Return to map Top of page
No designated areas for this pollutant.
Delaware 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.