Indiana's Ozone Plan Approved to Safeguard Visibility in Other States
Published Date: 4/10/2026
Proposed Rule
Summary
The EPA is proposing to approve Indiana’s plan to keep the air clean and protect visibility for the 2015 ozone air quality rules. This means Indiana promises to stop pollution that could mess up the clear skies in other states. People and businesses in Indiana should know this plan helps keep the air fresh without adding new costs, and comments are open until May 11, 2026.
Analyzed Economic Effects
4 provisions identified: 4 benefits, 0 costs, 0 mixed.
Indiana Keeps Visibility Protections
The EPA is proposing to approve Indiana's plan (the November 2, 2018 submission) that meets the Clean Air Act 'Prong 4' visibility requirement for the 2015 ozone standard. The EPA notes Indiana has a fully approved regional haze SIP (approved January 26, 2026), and this approval is intended to help keep skies clear without imposing new requirements beyond state law.
Small Businesses Not Hit With New Costs
The EPA states this approval "does not impose additional requirements beyond those imposed by State law" and certifies the action "is not having a significant economic impact on a substantial number of small entities." That means small businesses in Indiana should not face new federal costs from this proposed approval.
No Tribal-Area Application or Costs
The EPA states this SIP approval is not approved to apply on any Indian reservation land or in areas where a Tribe has demonstrated jurisdiction. In those tribal areas, the action will not impose substantial direct costs on Tribal governments.
No Unfunded Mandates on Small Governments
The EPA declares this approval "does not contain any unfunded mandate or significantly or uniquely affect small governments" under the Unfunded Mandates Reform Act. That means small local governments are not expected to face new unfunded federal obligations from this action.
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