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EPA gives California a split verdict on heavy-duty truck inspections

EPA just split California’s heavy-duty vehicle inspection rule in two: partly approved, partly disapproved, in a final SIP action. The key question is what survives and what does not[1].

  • Introducing CARB’s Clean Truck Check (CTC): Heavy-Duty Vehicle Emissions Inspection and Maintenance Program
🧵 1/4

The approved piece covers vehicles registered within California, which EPA says can become federally enforceable as part of the California SIP[2].

🧵 2/4

EPA rejected the part trying to reach out-of-state and out-of-country vehicles, saying California did not provide the assurances required under the Clean Air Act[3].

🧵 3/4

The agency also said that partial disapproval will not trigger sanctions and does not require a federal implementation plan[4][5].

🧵 4/4
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