{
"openapi": "3.1.0",
"info": {
"title": "Federal Register API",
"version": "1.0.0",
"description": "Search every Federal Register rule, proposed rule, notice and executive order by keyword, agency and date.\n\nThe US government's daily journal, queryable. Search every Federal Register document — final rules, proposed rules, notices and presidential documents — by keyword, type, agency and date ('artificial intelligence' final rules: 318 and counting), with title, abstract, agencies, publication date and both HTML and PDF links, plus full document detail with CFR references, docket ids, effective dates, comment deadlines and raw-text URLs. A dedicated executive-orders endpoint covers every EO since the Clinton administration with number, signing date and president — filter by president (Obama: exactly 294) or signing-date range; friendly names like 'obama' and 'biden' resolve to the official identifiers. An agencies directory (with the slugs the filters expect) rounds it out. Responses proxy the official National Archives API with 1-hour edge caching, and the pagination quirk where the upstream floors page size at 20 is handled so pages never skip documents. Legal tech, compliance monitoring, policy research, lobbying intelligence and newsrooms — regulatory change, at API speed.",
"contact": {
"name": "Data and APIs",
"url": "https://dataandapis.com/contact"
},
"termsOfService": "https://dataandapis.com/terms-of-service",
"license": {
"name": "Data and APIs Terms of Service",
"url": "https://dataandapis.com/terms-of-service"
},
"x-logo": {
"url": "https://dataandapis.com/images/federal-register.webp"
}
},
"externalDocs": {
"description": "Documentation, live tester and pricing",
"url": "https://dataandapis.com/apis/federal-register"
},
"servers": [
{
"url": "https://api-federal-register.dataandapis.com"
}
],
"tags": [
{
"name": "Data",
"description": "Federal Register API belongs to the Data category of the Data and APIs catalog."
}
],
"paths": {
"/v1/federal-register/agencies": {
"get": {
"operationId": "agencies",
"summary": "Agencies",
"description": "Agencies endpoint of the Federal Register API. Costs 2 tokens per call.",
"externalDocs": {
"url": "https://dataandapis.com/apis/federal-register/agencies"
},
"parameters": [
{
"name": "q",
"in": "query",
"required": false,
"schema": {
"type": "string"
},
"example": "treasury"
}
],
"responses": {
"200": {
"description": "Successful response",
"content": {
"application/json": {
"schema": {
"type": "object"
},
"example": {
"ok": true,
"total": 2,
"agencies": [
{
"name": "Inspector General Office, Treasury Department",
"short_name": "TOIG",
"slug": "inspector-general-office-treasury-department",
"url": "https://www.federalregister.gov/agencies/inspector-general-office-treasury-department"
},
{
"name": "Treasury Department",
"short_name": "TREAS",
"slug": "treasury-department",
"url": "https://www.federalregister.gov/agencies/treasury-department"
}
]
}
}
}
},
"401": {
"description": "Missing or invalid API key"
},
"402": {
"description": "Subscription past due; the response carries a payment_url"
},
"429": {
"description": "Monthly token allowance exhausted"
}
},
"security": [
{
"ApiKey": []
}
]
}
},
"/v1/sources": {
"get": {
"operationId": "dataSources",
"summary": "Data Sources",
"description": "Data Sources endpoint of the Federal Register API. Costs 2 tokens per call.",
"externalDocs": {
"url": "https://dataandapis.com/apis/federal-register/data-sources"
},
"responses": {
"200": {
"description": "Successful response",
"content": {
"application/json": {
"schema": {
"type": "object"
},
"example": {
"ok": true,
"sources": [
{
"slug": "federal-register",
"name": "Federal Register API",
"publisher": "US National Archives / Government Publishing Office",
"licence": "US government work (public domain)",
"source_url": "https://www.federalregister.gov/developers/documentation/api/v1",
"file_url": "https://www.federalregister.gov/api/v1/documents.json",
"cadence": "published every business day; responses edge-cached 1 hour"
}
]
}
}
}
},
"401": {
"description": "Missing or invalid API key"
},
"402": {
"description": "Subscription past due; the response carries a payment_url"
},
"429": {
"description": "Monthly token allowance exhausted"
}
},
"security": [
{
"ApiKey": []
}
]
}
},
"/v1/federal-register/documents/{number}": {
"get": {
"operationId": "documentDetail",
"summary": "Document Detail",
"description": "Document Detail endpoint of the Federal Register API. Costs 2 tokens per call.",
"externalDocs": {
"url": "https://dataandapis.com/apis/federal-register/document-detail"
},
"parameters": [
{
"name": "number",
"in": "path",
"required": true,
"schema": {
"type": "string"
},
"example": "2026-18141"
}
],
"responses": {
"200": {
"description": "Successful response",
"content": {
"application/json": {
"schema": {
"type": "object"
},
"example": {
"ok": true,
"document": {
"document_number": "2026-18141",
"title": "Establishing the United States Space Academy",
"type": "Presidential Document",
"abstract": null,
"publication_date": "2026-09-03",
"signing_date": "2026-08-28",
"executive_order_number": "14423",
"agencies": [
"Executive Office of the President"
],
"docket_ids": [],
"cfr_references": [],
"effective_on": null,
"comments_close_on": null,
"html_url": "https://www.federalregister.gov/documents/2026/09/03/2026-18141/establishing-the-united-states-space-academy",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2026-09-03/pdf/2026-18141.pdf",
"body_html_url": "https://www.federalregister.gov/documents/full_text/html/2026/09/03/2026-18141.html",
"raw_text_url": "https://www.federalregister.gov/documents/full_text/text/2026/09/03/2026-18141.txt"
}
}
}
}
},
"401": {
"description": "Missing or invalid API key"
},
"402": {
"description": "Subscription past due; the response carries a payment_url"
},
"429": {
"description": "Monthly token allowance exhausted"
}
},
"security": [
{
"ApiKey": []
}
]
}
},
"/v1/federal-register/executive-orders": {
"get": {
"operationId": "executiveOrders",
"summary": "Executive Orders",
"description": "Executive Orders endpoint of the Federal Register API. Costs 2 tokens per call.",
"externalDocs": {
"url": "https://dataandapis.com/apis/federal-register/executive-orders"
},
"parameters": [
{
"name": "from",
"in": "query",
"required": false,
"schema": {
"type": "string"
}
},
{
"name": "president",
"in": "query",
"required": false,
"schema": {
"type": "string"
},
"example": "obama"
}
],
"responses": {
"200": {
"description": "Successful response",
"content": {
"application/json": {
"schema": {
"type": "object"
},
"example": {
"ok": true,
"page": 1,
"limit": 20,
"total": 294,
"total_pages": 15,
"executive_orders": [
{
"document_number": "2017-01623",
"title": "Amending the Civil Service Rules, Executive Order 13488, and Executive Order 13467 To Modernize the Executive Branch-Wide Governance Structure and Processes for Security Clearances, Suitability and Fitness for Employment, and Credentialing, and Related Matters",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2017-01-23",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2017/01/23/2017-01623/amending-the-civil-service-rules-executive-order-13488-and-executive-order-13467-to-modernize-the",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2017-01-23/pdf/2017-01623.pdf",
"executive_order_number": "13764",
"signing_date": "2017-01-17",
"president": "Barack Obama"
},
{
"document_number": "2017-01489",
"title": "Providing an Order of Succession Within the Environmental Protection Agency",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2017-01-19",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2017/01/19/2017-01489/providing-an-order-of-succession-within-the-environmental-protection-agency",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2017-01-19/pdf/2017-01489.pdf",
"executive_order_number": "13763",
"signing_date": "2017-01-13",
"president": "Barack Obama"
},
{
"document_number": "2017-01487",
"title": "Providing an Order of Succession Within the Department of Justice",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2017-01-19",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2017/01/19/2017-01487/providing-an-order-of-succession-within-the-department-of-justice",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2017-01-19/pdf/2017-01487.pdf",
"executive_order_number": "13762",
"signing_date": "2017-01-13",
"president": "Barack Obama"
},
{
"document_number": "2017-01197",
"title": "Recognizing Positive Actions by the Government of Sudan and Providing for the Revocation of Certain Sudan-Related Sanctions",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2017-01-18",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2017/01/18/2017-01197/recognizing-positive-actions-by-the-government-of-sudan-and-providing-for-the-revocation-of-certain",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2017-01-18/pdf/2017-01197.pdf",
"executive_order_number": "13761",
"signing_date": "2017-01-13",
"president": "Barack Obama"
},
{
"document_number": "2017-01169",
"title": "Exclusions From the Federal Labor-Management Relations Program",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2017-01-17",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2017/01/17/2017-01169/exclusions-from-the-federal-labor-management-relations-program",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2017-01-17/pdf/2017-01169.pdf",
"executive_order_number": "13760",
"signing_date": "2017-01-12",
"president": "Barack Obama"
},
{
"document_number": "2017-01168",
"title": "Designating the World Organisation for Animal Health as a Public International Organization Entitled To Enjoy Certain Privileges, Exemptions, and Immunities",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2017-01-17",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2017/01/17/2017-01168/designating-the-world-organisation-for-animal-health-as-a-public-international-organization-entitled",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2017-01-17/pdf/2017-01168.pdf",
"executive_order_number": "13759",
"signing_date": "2017-01-12",
"president": "Barack Obama"
},
{
"document_number": "2017-01164",
"title": "Amending Executive Order 11016 To Update Eligibility Criteria for Award of the Purple Heart",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2017-01-17",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2017/01/17/2017-01164/amending-executive-order-11016-to-update-eligibility-criteria-for-award-of-the-purple-heart",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2017-01-17/pdf/2017-01164.pdf",
"executive_order_number": "13758",
"signing_date": "2017-01-12",
"president": "Barack Obama"
},
{
"document_number": "2016-31922",
"title": "Taking Additional Steps to Address the National Emergency With Respect to Significant Malicious Cyber- Enabled Activities",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2017-01-03",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2017/01/03/2016-31922/taking-additional-steps-to-address-the-national-emergency-with-respect-to-significant-malicious",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2017-01-03/pdf/2016-31922.pdf",
"executive_order_number": "13757",
"signing_date": "2016-12-28",
"president": "Barack Obama"
},
{
"document_number": "2016-31875",
"title": "Adjustments of Certain Rates of Pay",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2016-12-30",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2016/12/30/2016-31875/adjustments-of-certain-rates-of-pay",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2016-12-30/pdf/2016-31875.pdf",
"executive_order_number": "13756",
"signing_date": "2016-12-27",
"president": "Barack Obama"
},
{
"document_number": "2016-31792",
"title": "Providing an Order of Succession Within the Department of Labor",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2016-12-30",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2016/12/30/2016-31792/providing-an-order-of-succession-within-the-department-of-labor",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2016-12-30/pdf/2016-31792.pdf",
"executive_order_number": "13755",
"signing_date": "2016-12-23",
"president": "Barack Obama"
},
{
"document_number": "2016-30277",
"title": "Northern Bering Sea Climate Resilience",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2016-12-14",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2016/12/14/2016-30277/northern-bering-sea-climate-resilience",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2016-12-14/pdf/2016-30277.pdf",
"executive_order_number": "13754",
"signing_date": "2016-12-09",
"president": "Barack Obama"
},
{
"document_number": "2016-30272",
"title": "Amending the Order of Succession in the Department of Homeland Security",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2016-12-14",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2016/12/14/2016-30272/amending-the-order-of-succession-in-the-department-of-homeland-security",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2016-12-14/pdf/2016-30272.pdf",
"executive_order_number": "13753",
"signing_date": "2016-12-09",
"president": "Barack Obama"
},
{
"document_number": "2016-30101",
"title": "Relating to the Implementation of the Convention on the International Recovery of Child Support and Other Forms of Family Maintenance",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2016-12-13",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2016/12/13/2016-30101/relating-to-the-implementation-of-the-convention-on-the-international-recovery-of-child-support-and",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2016-12-13/pdf/2016-30101.pdf",
"executive_order_number": "13752",
"signing_date": "2016-12-08",
"president": "Barack Obama"
},
{
"document_number": "2016-29519",
"title": "Safeguarding the Nation From the Impacts of Invasive Species",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2016-12-08",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2016/12/08/2016-29519/safeguarding-the-nation-from-the-impacts-of-invasive-species",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2016-12-08/pdf/2016-29519.pdf",
"executive_order_number": "13751",
"signing_date": "2016-12-05",
"president": "Barack Obama"
},
{
"document_number": "2016-29494",
"title": "Regarding the Proposed Acquisition of a Controlling Interest in Aixtron SE by Grand Chip Investment GmbH",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2016-12-07",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2016/12/07/2016-29494/regarding-the-proposed-acquisition-of-a-controlling-interest-in-aixtron-se-by-grand-chip-investment",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2016-12-07/pdf/2016-29494.pdf",
"president": "Barack Obama"
},
{
"document_number": "2016-29169",
"title": "Providing for the Appointment of Alumni of the Fulbright U.S. Student Program, the Benjamin A. Gilman International Scholarship Program, and the Critical Language Scholarship Program to the Competitive Service",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2016-12-02",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2016/12/02/2016-29169/providing-for-the-appointment-of-alumni-of-the-fulbright-us-student-program-the-benjamin-a-gilman",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2016-12-02/pdf/2016-29169.pdf",
"executive_order_number": "13750",
"signing_date": "2016-11-29",
"president": "Barack Obama"
},
{
"document_number": "2016-29165",
"title": "Providing for the Appointment in the Competitive Service of Certain Employees of the Foreign Service",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2016-12-02",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2016/12/02/2016-29165/providing-for-the-appointment-in-the-competitive-service-of-certain-employees-of-the-foreign-service",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2016-12-02/pdf/2016-29165.pdf",
"executive_order_number": "13749",
"signing_date": "2016-11-29",
"president": "Barack Obama"
},
{
"document_number": "C1-2016-26070",
"title": "Correction",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2016-11-22",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2016/11/22/C1-2016-26070/correction",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2016-11-22/pdf/C1-2016-26070.pdf",
"president": "Barack Obama"
},
{
"document_number": "2016-28203",
"title": "Establishing a Community Solutions Council",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2016-11-21",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2016/11/21/2016-28203/establishing-a-community-solutions-council",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2016-11-21/pdf/2016-28203.pdf",
"executive_order_number": "13748",
"signing_date": "2016-11-16",
"president": "Barack Obama"
},
{
"document_number": "2016-27171",
"title": "Advancing the Global Health Security Agenda To Achieve a World Safe and Secure From Infectious Disease Threats",
"type": "Presidential Document",
"subtype": "Executive Order",
"abstract": null,
"publication_date": "2016-11-09",
"agencies": [
"Executive Office of the President"
],
"html_url": "https://www.federalregister.gov/documents/2016/11/09/2016-27171/advancing-the-global-health-security-agenda-to-achieve-a-world-safe-and-secure-from-infectious",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2016-11-09/pdf/2016-27171.pdf",
"executive_order_number": "13747",
"signing_date": "2016-11-04",
"president": "Barack Obama"
}
]
}
}
}
},
"401": {
"description": "Missing or invalid API key"
},
"402": {
"description": "Subscription past due; the response carries a payment_url"
},
"429": {
"description": "Monthly token allowance exhausted"
}
},
"security": [
{
"ApiKey": []
}
]
}
},
"/v1/federal-register/documents": {
"get": {
"operationId": "searchDocuments",
"summary": "Search Documents",
"description": "Search Documents endpoint of the Federal Register API. Costs 2 tokens per call.",
"externalDocs": {
"url": "https://dataandapis.com/apis/federal-register/search-documents"
},
"parameters": [
{
"name": "agency",
"in": "query",
"required": false,
"schema": {
"type": "string"
},
"example": "environmental-protection-agency"
},
{
"name": "from",
"in": "query",
"required": false,
"schema": {
"type": "string"
},
"example": "2026-01-01"
},
{
"name": "page",
"in": "query",
"required": false,
"schema": {
"type": "string"
},
"example": "1"
},
{
"name": "q",
"in": "query",
"required": false,
"schema": {
"type": "string"
},
"example": "artificial intelligence"
},
{
"name": "to",
"in": "query",
"required": false,
"schema": {
"type": "string"
}
},
{
"name": "type",
"in": "query",
"required": false,
"schema": {
"type": "string"
},
"example": "RULE"
}
],
"responses": {
"200": {
"description": "Successful response",
"content": {
"application/json": {
"schema": {
"type": "object"
},
"example": {
"ok": true,
"page": 1,
"limit": 20,
"total": 4,
"total_pages": 1,
"documents": [
{
"document_number": "2026-10387",
"title": "Phasedown of Hydrofluorocarbons: Reconsideration of Certain Regulatory Requirements Promulgated Under the Technology Transitions Provisions of the American Innovation and Manufacturing Act of 2020",
"type": "Rule",
"subtype": null,
"abstract": "The U.S. Environmental Protection Agency (EPA) is finalizing changes to regulations promulgated under the Technology Transitions provision of the American Innovation and Manufacturing Act of 2020 (AIM Act), which authorizes the Administrator to restrict fully, partially, or on a graduated schedule, the use of a \"regulated substance\" in the sector or subsector in which they are used. This final rule addresses administrative petitions and input received from regulated industry and other interested parties relevant to requirements and restrictions across various refrigeration and air conditioning subsectors, including: refrigerated transport--intermodal containers; industrial process refrigeration and chillers for industrial process refrigeration used in semiconductor manufacturing; retail food supermarket systems; retail food remote condensing unit systems; cold storage warehouses; refrigerated laboratory centrifuges and laboratory shakers; and condensing units in residential and light commercial air conditioning and heat pumps. This final rule also allows the inventory of residential and light commercial air conditioning and heat pump equipment that was manufactured in the United States or imported into the United States before January 1, 2025, to continue to be installed.",
"publication_date": "2026-05-26",
"agencies": [
"Environmental Protection Agency"
],
"html_url": "https://www.federalregister.gov/documents/2026/05/26/2026-10387/phasedown-of-hydrofluorocarbons-reconsideration-of-certain-regulatory-requirements-promulgated-under",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2026-05-26/pdf/2026-10387.pdf",
"president": "Donald Trump"
},
{
"document_number": "2026-03638",
"title": "National Emission Standards for Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units: Final Repeal",
"type": "Rule",
"subtype": null,
"abstract": "The U.S. Environmental Protection Agency (EPA) is finalizing the repeal of specific amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Coal- and Oil-Fired Electric Utility Steam Generating Units (EGUs), commonly referred to as the Mercury and Air Toxics Standards (MATS), that were promulgated on May 7, 2024. Specifically, the EPA is repealing the revised filterable particulate matter (fPM) emission standard, which serves as a surrogate for non-mercury hazardous air pollutant (HAP) metals for existing coal- fired EGUs; the revised fPM emission standard compliance demonstration requirements; and the revised mercury (Hg) emission standard for lignite-fired EGUs. The EPA is also making technical, non-substantive clarifications to electronic reporting requirements.",
"publication_date": "2026-02-24",
"agencies": [
"Environmental Protection Agency"
],
"html_url": "https://www.federalregister.gov/documents/2026/02/24/2026-03638/national-emission-standards-for-hazardous-air-pollutants-coal--and-oil-fired-electric-utility-steam",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2026-02-24/pdf/2026-03638.pdf",
"president": "Donald Trump"
},
{
"document_number": "2026-01413",
"title": "Air Plan Disapproval; Colorado; Regional Haze Plan for the Second Implementation Period",
"type": "Rule",
"subtype": null,
"abstract": "The Environmental Protection Agency (EPA) is disapproving a regional haze state implementation plan (SIP) revision submitted in 2022 by the State of Colorado under the Clean Air Act (CAA or Act) and the EPA's Regional Haze Rule (RHR) for the program's second implementation period. Colorado's 2022 regional haze SIP revision addresses the requirement that states revise their long-term strategies every implementation period to make reasonable progress towards the national goal of preventing any future, and remedying any existing, anthropogenic impairment of visibility, including regional haze, in mandatory Class I Federal areas (Class I areas). We are disapproving Colorado's 2022 regional haze SIP revision pursuant to the CAA and regulatory regional haze requirements. The EPA is not taking final action at this time on a separate revision to Colorado's SIP that consolidates existing, previously approved regional haze provisions into the same regulation where Colorado's new, second planning period provisions are located.",
"publication_date": "2026-01-26",
"agencies": [
"Environmental Protection Agency"
],
"html_url": "https://www.federalregister.gov/documents/2026/01/26/2026-01413/air-plan-disapproval-colorado-regional-haze-plan-for-the-second-implementation-period",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2026-01-26/pdf/2026-01413.pdf",
"president": "Donald Trump"
},
{
"document_number": "2026-00677",
"title": "New Source Performance Standards Review for Stationary Combustion Turbines and Stationary Gas Turbines",
"type": "Rule",
"subtype": null,
"abstract": "The U.S. Environmental Protection Agency (EPA, or Agency) is finalizing amendments to the new source performance standards (NSPS) for stationary combustion turbines and stationary gas turbines pursuant to a review required by the Clean Air Act (CAA). As a result of this review, the EPA is establishing subcategories for new, modified, or reconstructed stationary combustion turbines based on size, rates of utilization, design efficiency, and fuel type. The EPA determined that combustion controls are the best system of emission reduction (BSER) for nitrogen oxide (NOX) emissions for most new, modified, or reconstructed stationary combustion turbines. For one subcategory, the BSER for NOX is combustion controls with the addition of selective catalytic reduction (SCR). The EPA further determined that the BSER for sulfur dioxide (SO2) emissions has not changed since the last NSPS review. Based on these determinations, the Agency is promulgating standards of performance in a new subpart of the Code of Federal Regulations (CFR). The Agency is also adding a subcategory for stationary combustion turbines that are used in temporary applications, exempting certain sources from title V requirements, and finalizing other provisions. The EPA is finalizing amendments to existing regulations to address or clarify specific technical and editorial issues.",
"publication_date": "2026-01-15",
"agencies": [
"Environmental Protection Agency"
],
"html_url": "https://www.federalregister.gov/documents/2026/01/15/2026-00677/new-source-performance-standards-review-for-stationary-combustion-turbines-and-stationary-gas",
"pdf_url": "https://www.govinfo.gov/content/pkg/FR-2026-01-15/pdf/2026-00677.pdf",
"president": "Donald Trump"
}
]
}
}
}
},
"401": {
"description": "Missing or invalid API key"
},
"402": {
"description": "Subscription past due; the response carries a payment_url"
},
"429": {
"description": "Monthly token allowance exhausted"
}
},
"security": [
{
"ApiKey": []
}
]
}
}
},
"components": {
"securitySchemes": {
"ApiKey": {
"type": "apiKey",
"in": "header",
"name": "X-Api-Key",
"description": "Create a free key at https://dataandapis.com/sign-up. 500 tokens a month on the Free plan; this API costs 2 tokens per call."
}
}
},
"security": [
{
"ApiKey": []
}
]
}