Recent Updates: Federal Register Notices Published or Effective After March 31, 2021

Data is current as of April 19, 2021

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Note:
On March 26, 2021, EPA designated additional nonattainment areas for the 2010 SO2 NAAQS, effective April 30, 2021 (86 FR 16055). These nine new areas are in addition to the SO2 (2010) nonattainment areas previously designated effective 10/04/2013, 09/12/2016, 01/12/2017, and 04/09/2018.

• Henderson-Webster Counties, KY
• New Madrid County, MO
• St. Lawrence County, NY
• Howard County, TX
• Hutchinson County, TX
• Navarro County, TX
• Giles County, VA
• Whatcom County, WA
• Outagamie County, WI - - On April 14, 2021, EPA withdrew the designation of Outagamie County, WI as a nonattainment area for the 2010 SO2 NAAQS (86 FR 19576). The Outagamie County area will be designated as Attainment/Unclassifiable instead of Nonattainment, effective April 30, 2021.

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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)
04/08/2021	San Diego County, CA (CA)
	Change to a Higher Classification (Bump-Ups)
	Proposed Approval
	86 FR 18227
8-Hour Ozone (2008)
04/08/2021	San Diego County, CA (CA)
	Change to a Higher Classification (Bump-Ups)
	Proposed Approval
	86 FR 18227
PM-2.5 (2006)
04/06/2021	Provo, UT (UT)
	Redesignation to Maintenance
	Reopening of Public Comment Period
	86 FR 17762
04/06/2021	Salt Lake City, UT (UT)
	Redesignation to Maintenance
	Reopening of Public Comment Period
	86 FR 17762
PM-10 (1987)
04/19/2021	Butte, MT (MT)
	Redesignation to Maintenance
	Proposed Approval
	86 FR 20353
Sulfur Dioxide (2010)
03/02/2021	Southwest Indiana, IN (IN)
	Redesignation to Maintenance
	Final Approval
	Effective: 04/30/2021
	86 FR 12107

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