Recent Updates: Federal Register Notices Published or Effective After May 31, 2026

Data is current as of June 05, 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)
05/29/2026	Baltimore, MD (MD)
	Clean Data Determination/Attainment Determination
	Final Approval
	Effective: 06/29/2026
	91 FR 31914
05/29/2026	Detroit, MI (MI)
	Designation Reinstatement
	Final Approval
	Effective: 06/29/2026
	91 FR 31953
06/04/2026	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (DE)
	Boundary Change
	Final Approval
	Effective: 07/06/2026
	91 FR 33610
06/04/2026	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (DE)
	Clean Data Determination/Attainment Determination
	Final Approval
	Effective: 07/06/2026
	91 FR 33610
06/04/2026	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (MD)
	Boundary Change
	Final Approval
	Effective: 07/06/2026
	91 FR 33610
06/04/2026	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (MD)
	Clean Data Determination/Attainment Determination
	Final Approval
	Effective: 07/06/2026
	91 FR 33610
8-Hour Ozone (2008)
06/04/2026	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (DE)
	Boundary Change
	Final Approval
	Effective: 07/06/2026
	91 FR 33610
06/04/2026	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (DE)
	Clean Data Determination/Attainment Determination
	Final Approval
	Effective: 07/06/2026
	91 FR 33610
06/04/2026	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (MD)
	Boundary Change
	Final Approval
	Effective: 07/06/2026
	91 FR 33610
06/04/2026	Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (MD)
	Clean Data Determination/Attainment Determination
	Final Approval
	Effective: 07/06/2026
	91 FR 33610

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