Green Book
You are here: EPA Home
>
Green Book
>
Recent Updates: Federal Register Notices Published or Effective After March 31, 2026
Recent Updates: Federal Register Notices Published or Effective After March 31, 2026
Data is current as of April 23, 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) | |
| 03/23/2026 | Phoenix-Mesa, AZ (AZ) |
| 179B Determination | |
| Final Approval | |
| Effective: 04/22/2026 | |
| 91 FR 13777 | |
| 04/06/2026 | Phoenix-Mesa, AZ (AZ) |
| Correction/Clarification | |
| Final Approval | |
| Effective: 04/22/2026 | |
| 91 FR 17144 | |
| 04/10/2026 | Cleveland, OH (OH) |
| Redesignation to Maintenance | |
| Proposed Approval | |
| 91 FR 18355 | |
| 04/23/2026 | Greater Connecticut, CT (CT) |
| Change to a Higher Classification (Bump-Ups) | |
| Final Approval | |
| Effective: 05/26/2026 | |
| 91 FR 21729 | |
| 04/23/2026 | Greater Connecticut, CT (CT) |
| Failure to Attain by Attainment Date | |
| Final Approval | |
| Effective: 05/26/2026 | |
| 91 FR 21729 | |
| 04/23/2026 | Uinta Basin, UT (UT) |
| Clean Data Determination/Attainment Determination | |
| Proposed Approval | |
| 91 FR 21753 | |
| 04/23/2026 | Uinta Basin, UT (UT) |
| Attainment Date Extension | |
| Proposed Approval | |
| 91 FR 21753 | |
| Lead (2008) | |
| 04/10/2026 | Canton-Stark County, OH (OH) |
| Redesignation to Maintenance | |
| Proposed Approval | |
| 91 FR 18372 | |
| PM-2.5 (2012) | |
| 04/16/2026 | Allegheny County, PA (PA) |
| Redesignation to Maintenance | |
| Final Approval | |
| Effective: 05/18/2026 | |
| 91 FR 20369 | |
| 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 | |
| 04/10/2026 | St. Clair, MI (MI) |
| Redesignation to Maintenance | |
| Proposed Approval | |
| 91 FR 18383 | |
Go Top