40 CFR Part 52
14 final rules have amended 40 CFR Part 52 since September 2026
Every final rule amending 40 CFR Part 52, Approval and Promulgation of Implementation Plans, recorded by effective date across 2 months and 1 agency. Rules whose date has passed are kept: they are what the part now says.
Final rules amending this part, September 2026 onward.
Carrying an effective date that has not arrived.
Promulgating bodies that have amended it.
What this part is
40 CFR Part 52 - Approval and Promulgation of Implementation Plans
The most recent change to this part takes effect 14 October 2026: Approval and Promulgation of Implementation Plans; California; San Joaquin Valley, Revisions to Motor Vehicle Emissions Budgets for Ozone. The source describes it as revision to the State of California's state implementation plan (SIP) for the San Joaquin Valley (SJV) area.
Approval and Promulgation of Implementation Plans sits in Title 40 of the Code of Federal Regulations, Protection of Environment. Over the 2 months in this record it has been amended by 14 final rules, roughly 7 a month. Every one of them came from the Environmental Protection Agency. 14 carry an effective date that has not arrived yet.
Part heading read from the eCFR Versioner API as of 30 August 2026. Amendment counts are this property's own join of the Federal Register against that heading; the two sources do not publish it together.
The records
Every rule amending this part
Oldest first, by the day each rule took effect. Rules whose date has passed are kept: they are what the part now says. A red margin rule marks a rule binding today; a faint rule marks one binding within 30 days.
-
001
Determination of Attainment by the Attainment Date and Clean Data Determination for the 2012 Annual Fine Particulate Standard; Plumas County, California
Prior state Not stated in the source document.
in 2 days Federal Register → -
002
Determination of Attainment by the Attainment Date; 1997 Ozone Standards; California; Coachella Valley
Prior state Not stated in the source document.
in 2 days Federal Register → -
003
Air Plan Approval; Illinois; Clean Data Determination for the Illinois Portion of the St. Louis Area for the 2015 Ozone Standard
Prior state Not stated in the source document.
in 2 days Federal Register → -
004
Air Plan Approval; Missouri; Clean Data Determination for the 2015 8-Hour Ozone Standard for the Missouri Portion of the St. Louis Nonattainment Area
Prior state Not stated in the source document.
in 2 days Federal Register → -
005
Approval of Source-Specific Air Quality Implementation Plan; New York; Big Six Towers Inc.
Prior state revision to the State of New York's State Implementation Plan (SIP) for the ozone National Ambient Air Quality Standard (NAAQS) related to a source-specific SIP (SSSIP) revision for Big Six Towers Inc. (the Big Six), located at 59-55 47th Ave. Woodside, NY 11377 (the Facility).
in 2 days Federal Register → -
006
Air Plan Approval; Wisconsin; Moderate Attainment Plan Elements for Wisconsin's 2015 Ozone Standard Areas
Prior state Not stated in the source document.
in 9 days Federal Register → -
007
Air Plan Approval; Arizona; Attainment Plan for the Hayden SO2 Nonattainment Area for the 1971 and 2010 Sulfur Dioxide National Ambient Air Quality Standards
Prior state revisions to the Arizona state implementation plan (SIP) for attaining the 1971 and 2010 sulfur dioxide (SO<INF>2</INF>) national ambient air quality standards (NAAQS or "standards") in the Hayden SO<INF>2</INF> nonattainment area.
in 9 days Federal Register → -
008
Air Plan Approval; SC; Department Name Change
Prior state revision submitted by the State of South Carolina on July 23, 2025.
in 9 days Federal Register → -
009
Air Plan Approval; Michigan; 2015 Ozone Moderate Reasonably Available Control Technology
Prior state revisions and additions to Michigan Air Pollution Control Rules (MAPCR) Parts 6 and 8 for inclusion in the Michigan State Implementation Plan (SIP).
in 16 days Federal Register → -
010
Air Plan Approval; FL; Emissions Reporting Requirements and Permitting Forms
Prior state revision submitted by the Florida Department of Environmental Protection (FDEP) on August 15, 2023.
in 16 days Federal Register → -
011
Air Plan Approval; Arkansas; Regional Haze State Implementation Plan for the Second Implementation Period
Prior state revision submitted by the State of Arkansas through the Division of Environmental Quality (DEQ) on August 8, 2022, clarified by DEQ on July 29, 2025, and further supplemented on May 4, 2026, to satisfy the requirements of the Act and the EPA's Regional Haze Rule (RHR) for visibility protection in…
in 16 days Federal Register → -
012
Air Plan Approval; New York; Interstate Transport Requirements for the 2010 SO2 NAAQS
Prior state Not stated in the source document.
in 27 days Federal Register → -
013
Air Plan Approvals; Indiana; Prong 4 (Visibility) for the 2015 Ozone National Ambient Air Quality Standard
Prior state Not stated in the source document.
in 27 days Federal Register → -
014
Approval and Promulgation of Implementation Plans; California; San Joaquin Valley, Revisions to Motor Vehicle Emissions Budgets for Ozone
Prior state revision to the State of California's state implementation plan (SIP) for the San Joaquin Valley (SJV) area.
in 32 days Federal Register →
Cite this view
Every final rule amending 40 CFR Part 52, Approval and Promulgation of Implementation Plans, recorded by effective date across 2 months and 1 agency. Rules whose date has passed are kept: they are what the part now says. Figures read 12 September 2026. Cite the read date with the figure: the window moves as rules are published and amended.
40 CFR Part 52: Approval and Promulgation of Implementation Plans. Luminory federal effective-date record, 14 records, read 12 September 2026. https://luminory.org/cfr/40-52/Luminory. (2026). 40 CFR Part 52: Approval and Promulgation of Implementation Plans [Data set]. Derived from the U.S. Federal Register API. https://luminory.org/cfr/40-52/All citation formats · How this is derived · Raw data (CC BY 4.0)