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].

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

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].