EPA Approves Indiana's Ozone Visibility Prong: Snore Fest
Published Date: 9/9/2026
Rule
Summary
The U.S. Environmental Protection Agency (EPA) is approving a portion of Indiana's State Implementation Plan (SIP) submission regarding the infrastructure requirements in Clean Air Act (CAA) section 110 for the 2015 ozone National Ambient Air Quality Standards (NAAQS). The infrastructure requirements are designed to ensure that the structural components of each State's air quality management program are adequate to meet the State's responsibilities under the CAA. The EPA finds that Indiana's infrastructure submission fulfills CAA requirements for a State's SIP to contain adequate provisions prohibiting emissions that will interfere with required visibility protection measures in any other State's SIP. The EPA proposed to approve this action on April 10, 2026, and received no adverse comments.
Analyzed Economic Effects
2 provisions identified: 2 benefits, 0 costs, 0 mixed.
EPA Approves Indiana Prong 4 (Visibility)
The EPA is approving Indiana's November 2, 2018 interstate transport infrastructure SIP submission for the Prong 4 (visibility) requirement of CAA section 110(a)(2)(D)(i)(II) for the 2015 ozone NAAQS. The approval finalizes the EPA's proposed action from April 10, 2026 and is effective October 9, 2026, confirming that Indiana's SIP contains provisions prohibiting emissions that would interfere with visibility protection measures in other States' SIPs.
No New Federal Costs for Indiana Small Businesses
The EPA states this approval "does not impose additional requirements beyond those imposed by State law" and the action "is certified as not having a significant economic impact on a substantial number of small entities" under the Regulatory Flexibility Act. The final rule is effective October 9, 2026, and therefore does not create new federal compliance obligations for small entities beyond existing State requirements.
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
2026-18317, 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!
2026-12927, U.S. Ecology Nevada, Inc. High Mercury Subcategory Wastes Land Disposal Restrictions Variance
The EPA is giving U.S. Ecology Nevada a special green light to handle and dispose of high-mercury waste a bit differently than usual. This means mercury waste treated in Pennsylvania can now be safely sent to U.S. Ecology’s Nevada site for disposal under new rules starting July 27, 2026. This change helps protect people and the environment while keeping mercury waste management efficient and cost-effective.
2026-11047, National Emission Standards for Hazardous Air Pollutants From Hazardous Waste Combustors: Residual Risk and Technology Review
The EPA just updated rules for places that burn hazardous waste, like incinerators and boilers, to keep the air safe and clean. They confirmed current standards work well but added new limits on harmful gases like hydrogen fluoride and hydrogen cyanide. These changes start June 3, 2026, and include easier electronic reporting and some new rules for startup and shutdown times—helping protect health without big costs.
Previous / Next Documents
Previous: 2026-18324, Air Plan Approval; New York; Interstate Transport Requirements for the 2010 SO2 NAAQS
The Environmental Protection Agency (EPA or the Agency) is approving a State Implementation Plan (SIP) submitted by the State of New York for purpose of demonstrating that the State satisfies the interstate transport requirements, also known as the "good neighbor" provision of the Clean Air Act (CAA), for the 2010 1-hour sulfur dioxide (SO<INF>2</INF>) primary National Ambient Air Quality Standard (NAAQS). Under the good neighbor provision, each State's implementation plan must contain adequate provisions prohibiting the interstate transport of air pollution in amounts that will either contribute significantly to nonattainment, or interfere with maintenance, of the NAAQS in any other State. This action is being taken in accordance with the requirements of the Clean Air Act.
Next: 2026-18337, Simplified Geographic Preference Procurement in Child Nutrition Programs
This direct final rule amends geographic preference option language in National School Lunch Program, School Breakfast Program, Special Milk Program for Children, Child and Adult Care Program, and Summer Food Service Program regulations. The changes are customer- focused and intended to simplify program regulations and make them easier to understand. They do not change the meaning of the regulations or their implementation.