Idaho haze plan protects national park vistas from pollution blur
Published Date: 3/24/2025
Proposed Rule
Summary
The EPA is proposing to approve Idaho’s updated plan to keep the air clear and protect the views in national parks and wilderness areas from haze caused by pollution. This plan affects Idaho residents and businesses by setting rules to improve air quality over the next few years. Comments on the plan are open until April 23, 2025, so everyone has a chance to weigh in before it moves forward.
Analyzed Economic Effects
2 provisions identified: 1 benefits, 1 costs, 0 mixed.
EPA proposes approval of Idaho haze plan
The EPA is proposing to approve Idaho’s regional haze State Implementation Plan (SIP) revision submitted on August 5, 2022 and supplemented on May 8, 2024. The plan is intended to prevent and remedy manmade visibility impairment in national parks and wilderness (Class I) areas and sets rules to improve air quality; the public comment period is open until April 23, 2025.
Approved SIP creates enforceable limits for Idaho sources
The Idaho SIP revision must include enforceable emissions limitations, compliance schedules, and other measures necessary to make reasonable progress, and upon EPA approval a SIP is enforceable by the EPA and the public. This means the legally covered sources in Idaho identified in the SIP will be subject to those enforceable obligations if the EPA finalizes approval.
Personalized for You
How does this regulation affect your finances?
Personalize government policy and PRIA will tell you what this federal register document means for your household, plus every other regulation we track. PRIA reads each provision against your financial profile to show you exactly what matters to your wallet.
Key Dates
Department and Agencies
Related Federal Register Documents
2026-19072, Rescission of the Greenhouse Gas Findings for Fossil Fuel-Fired Power Plants and Repeal of Regulations for Power Plant Greenhouse Gas Emissions Under Clean Air Act Section 111
The EPA is proposing to cancel all greenhouse gas rules for fossil fuel power plants, saying the law doesn’t let them regulate these emissions for climate reasons. This change affects power plants across the U.S. and could impact future pollution limits and costs. Comments on this proposal are open until November 2, 2026, so now’s the time to speak up!
2026-19071, Partial Repeal of the Carbon Pollution Standards for Fossil Fuel-Fired Electric Generating Units
The EPA is rolling back most of the 2024 rules that limited carbon pollution from fossil fuel power plants. This change affects coal and gas plants by easing some strict limits on emissions and carbon capture technology. The new rules kick in on November 16, 2026, potentially saving money for power plants but raising questions about pollution control.
2026-18317, Updated Definition of “Waters of the United States”
The purpose of this supplemental notice of proposed rulemaking is for the U.S. Environmental Protection Agency (EPA) and the Department of the Army ("the agencies") to supplement and seek additional comment on certain aspects of an earlier proposal, published on November 20, 2025, to revise the regulations defining the scope of waters federally covered under the Clean Water Act in light of the U.S. Supreme Court's 2023 decision in Sackett v. Environmental Protection Agency. As stated in the agencies' November 20, 2025 Notice of Proposed Rulemaking (NPRM), the agencies intend for this rulemaking to provide greater regulatory certainty and increase Clean Water Act program predictability and consistency by clarifying the definition of "waters of the United States." After consideration of the public comments received on the NPRM, the agencies are issuing this notice to supplement the NPRM with additional regulatory options on certain aspects of the proposed rule.
2026-14112, Amendments and Nonconformance Penalties for Model Year 2027 and Later Heavy-Duty Highway Engines and Amendments to Inducement Provisions for SCR-Equipped Diesel Engines
Starting with model year 2027, the EPA is updating rules for big truck engines to make sure they last longer and pollute less. They’re also letting engine makers pay penalties if their engines don’t meet standards, and tightening rules for special pollution-control systems on diesel engines. These changes affect truck and engine makers and kick in soon, with public feedback due by August 29, 2026.
2026-13667, Minor New Source Review Program Air Permitting Public Participation Requirements for State Implementation Plans
The EPA wants to give states more freedom to decide how much public input is needed when approving small air pollution sources or changes. This means local air agencies can tailor public participation to fit their community’s needs while still protecting air quality. If you’re involved in air permits, watch for comment deadlines and possible virtual hearings this summer!
2026-13263, Revisions To Establish the Sixth Unregulated Contaminant Monitoring Rule (UCMR 6) for Public Water Systems
The EPA is rolling out the sixth Unregulated Contaminant Monitoring Rule (UCMR 6) to check for new, sneaky chemicals in public drinking water. Big water systems serving 3,300+ people and some smaller ones will test for 30 different contaminants, including certain PFAS and pesticides, to keep our water safe. Comments and feedback are open until late August 2026, and the EPA will host fun online meetings to chat about the plan!
Previous / Next Documents
Previous: 2025-04757, Guidance Regarding Certain Matters Relating to Nonrecognition of Gain or Loss in Corporate Separations, Incorporations, and Reorganizations; Technical Correction
The IRS fixed some wording in their January 2025 rules about when companies don’t have to report gains or losses during big changes like splits or mergers. These tweaks clarify that certain timeframes must be consecutive years, making the rules easier to follow. If you’re a business dealing with corporate reorganizations, these corrections help you avoid confusion and keep your tax filings smooth.
Next: 2025-04908, Air Plan Approval; AK, Fairbanks North Star Borough; 2006 24-Hour PM2.5 Serious Area and 189(d) Plan
The EPA is giving folks in Fairbanks North Star Borough, Alaska, extra time to comment on a plan to clean up harmful air pollution (PM2.5) from 2006. This plan aims to improve air quality and protect health by setting new rules, with comments open until April 23, 2025. No new changes to vehicle pollution budgets are included, so those reviews continue separately.