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

Data is current as of April 02, 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
PM-2.5 (2006)
04/02/2026	San Joaquin Valley, CA (CA)
	Failure to Attain by Attainment Date
	Proposed Approval
	91 FR 16614
04/02/2026	San Joaquin Valley, CA (CA)
	Attainment Date Extension Denied
	Proposed Approval
	91 FR 16614
04/02/2026	San Joaquin Valley, CA (CA)
	Correction/Clarification
	Proposed Approval
	91 FR 16614
Sulfur Dioxide (2010)
04/02/2026	Detroit, MI (MI)
	Redesignation to Maintenance
	Final Approval
	Effective: 04/02/2026
	91 FR 16562
04/02/2026	Muskingum River, OH (OH)
	Redesignation to Maintenance
	Final Approval
	Effective: 04/02/2026
	91 FR 16558

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