Recent Updates: Federal Register Notices Published or Effective After December 31, 2025

Data is current as of January 09, 2026

is displayed for notices published or effective within 30 days of the report "As of" date.
Federal Register Notices not in this Green Book will be available in reports in the next Green Book.
The "FR" links below will display Federal Register Notices from the Government Publishing Office (GPO) website.

NAAQS / Publication Date	Area Name / Action / Status / Effective Date / FRN Link
8-Hour Ozone (2015)
01/02/2026	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (DE)
	Boundary Change
	Proposed Approval
	91 FR 98
01/02/2026	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (DE)
	Clean Data Determination/Attainment Determination
	Proposed Approval
	91 FR 98
01/02/2026	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (MD)
	Boundary Change
	Proposed Approval
	91 FR 98
01/02/2026	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (MD)
	Clean Data Determination/Attainment Determination
	Proposed Approval
	91 FR 98
01/06/2026	Northern Wasatch Front, UT (UT)
	Boundary Change
	Final Approval
	Effective: 02/05/2026
	91 FR 339
8-Hour Ozone (2008)
01/02/2026	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (DE)
	Boundary Change
	Proposed Approval
	91 FR 98
01/02/2026	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (DE)
	Clean Data Determination/Attainment Determination
	Proposed Approval
	91 FR 98
01/02/2026	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (MD)
	Boundary Change
	Proposed Approval
	91 FR 98
01/02/2026	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (MD)
	Clean Data Determination/Attainment Determination
	Proposed Approval
	91 FR 98
Sulfur Dioxide (2010)
01/09/2026	Huntington, IN (IN)
	Redesignation to Maintenance
	Final Approval
	Effective: 01/09/2026
	97 FR 911

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