The Environmental Protection Agency has moved to block a California regulation aimed at reducing emissions from diesel trucks, arguing that it serves as a backdoor emission rule that would be imposed on the entire nation.

The EPA said on Monday that it is proposing to disapprove California’s Heavy-Duty (HD) Inspection and Maintenance (I/M) Requirements, also known as the Clean Truck Check, which requires periodic vehicle emission testing and monitoring to identify trucks in need of emissions-related repairs.

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