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Delaware Nonattainment/Maintenance Status for Each County by Year for All Criteria Pollutants

Data is current as of July 31, 2026

Listed by County, NAAQS, Area. The 8-hour Ozone (1997) standard was revoked on April 6, 2015 and the 1-hour Ozone (1979) standard was revoked on June 15, 2005.

* The 1997 Primary Annual PM-2.5 NAAQS (level of 15 µg/m3) is revoked in attainment and maintenance areas for that NAAQS. For additional information see the PM-2.5 NAAQS SIP Requirements Final Rule, effective October 24, 2016. (81 FR 58009)

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Important Notes Download National Dataset: dbf   |   xls    |   Data dictionary (PDF)
County NAAQS Area Name Nonattainment in Year Redesignation
to Maintenance		 Classification Whole or/
Part County		 Population
(2010)		 State/
County
FIPS Codes
DELAWARE
Kent County 1-Hour Ozone (1979)-NAAQS revoked Philadelphia-Wilmington-Trenton, PA-NJ-DE-MD
92 93 94 95 96 97 98 99 00 01 02 03 04                                                                                                              
/ / Severe-15 Whole 162,310 10/001
Kent County 8-Hour Ozone (1997)-NAAQS revoked Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE
                                                            04 05 06 07 08 09 10 11 12 13 14                                                            
/ / Moderate Whole 162,310 10/001
New Castle County 1-Hour Ozone (1979)-NAAQS revoked Philadelphia-Wilmington-Trenton, PA-NJ-DE-MD
92 93 94 95 96 97 98 99 00 01 02 03 04                                                                                                              
/ / Severe-15 Whole 538,479 10/003
New Castle County 8-Hour Ozone (1997)-NAAQS revoked Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE
                                                            04 05 06 07 08 09 10 11 12 13 14                                                            
/ / Moderate Whole 538,479 10/003
New Castle County 8-Hour Ozone (2008) New Castle County, DE
                                                                                                    12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
/ / Marginal Whole 538,479 10/003
New Castle County 8-Hour Ozone (2015) New Castle County, DE
                                                                                                                                  18 19 20 21 22 23 24 25 26
/ / Serious Whole 538,479 10/003
New Castle County PM-2.5 (1997)-NAAQS revoked Philadelphia-Wilmington, PA-NJ-DE
                                                                 05 06 07 08 09 10 11 12 13                                                                 
09/04/2014 * Moderate Whole 538,479 10/003
New Castle County PM-2.5 (2006) Philadelphia-Wilmington, PA-NJ-DE
                                                                                     09 10 11 12 13                                                                 
09/04/2014 Moderate Whole 538,479 10/003
Sussex County 1-Hour Ozone (1979)-NAAQS revoked Sussex County, DE
92 93 94 95 96 97 98 99 00 01 02 03 04                                                                                                              
/ / Marginal Whole 197,145 10/005
Sussex County 8-Hour Ozone (1997)-NAAQS revoked Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE
                                                            04 05 06 07 08 09 10 11 12 13 14                                                            
/ / Moderate Whole 197,145 10/005
Sussex County 8-Hour Ozone (2008) Seaford, DE
                                                                                                    12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
/ / Marginal Whole 197,145 10/005
Important Notes

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