Illinois Smog Plan Gets EPA Green Light Near Chicago
Published Date: 5/14/2026
Rule
Summary
The EPA is giving a thumbs-up to Illinois’ plan to keep the air cleaner around Chicago and Metro East by 2023. This plan includes checking cars for pollution, tracking emissions, and making sure new factories follow rules. Starting June 15, 2026, these steps will help the area meet ozone air quality goals without extra costs for residents.
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Analyzed Economic Effects
5 provisions identified: 5 benefits, 0 costs, 0 mixed.
State Vehicle Inspection Program Approved
If you drive in the Chicago or Metro East St. Louis areas of Illinois, the EPA approved Illinois' motor vehicle inspection and maintenance (I/M) program for the 2015 ozone standard. This approval is part of the State Implementation Plan and is effective June 15, 2026.
2023 Motor Vehicle Emissions Budgets Approved
The EPA found adequate and approved Illinois' 2023 motor vehicle emissions budgets for VOC and NOX for the Chicago and Metro East moderate ozone areas. This approval (part of the reasonable further progress demonstration for the 2015 ozone standard) is effective June 15, 2026.
No New Federal Costs for Residents
The EPA says this action merely approves Illinois' state law as meeting federal Clean Air Act requirements and does not impose additional federal requirements beyond State law. The rule is effective June 15, 2026.
Small Business Economic Impact Certified
The EPA certified that this approval does not have a significant economic impact on a substantial number of small entities under the Regulatory Flexibility Act. The certification is part of the final rule published May 14, 2026.
No Tribal Land Coverage or Costs
The EPA states this SIP approval is not approved to apply on any Indian reservation land or other areas where a Tribe has jurisdiction and that the rule will not impose substantial direct costs on Tribal governments. This position is noted in the final rule published May 14, 2026.
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