The U.S. Environmental Protection Agency (EPA) announced it will propose disapproval of California’s Heavy-Duty (HD) Inspection and Maintenance (I/M) requirement as part of the State Implementation Plan (SIP). The rule applies to all heavy-duty vehicles driven in California, regardless of registration location.
EPA’s Legal and Policy Position
EPA argues the rule violates the Commerce Clause and Clean Air Act Section 110, interfering with federal authority over interstate and foreign vehicles. EPA Administrator Lee Zeldin criticized the rule as a "power grab" that could increase costs for Americans reliant on trucking.
The EPA plans a partial disapproval: enforcing the rule for California-registered trucks but denying enforcement for out-of-state and foreign trucks.
Next Steps
• Formal proposal publication in the Federal Register initiates rulemaking. ,br> • 30-day public comment period for stakeholders, including fleets, manufacturers, and environmental groups.
Broader Context
This action aligns with recent federal moves to limit California’s stricter vehicle emission rules, including waivers repeals and Justice Department lawsuits against California’s Air Resources Board over Clean Truck Partnership standards.
Why It Matters?
• Upholds constitutional limits on state regulation of interstate commerce.
• Prevents a patchwork of inspection rules complicating interstate trucking.
• Protects out-of-state and international truck operators from added costs.
• Ensures consistent national vehicle emission standards.
Stakeholder Guidance
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Reference: EPA Press Release
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