This resource is intended to address key questions related to adoption and implementation of California’s Advanced Clean Trucks regulation. Under the federal Clean Air Act (CAA), California is the only state permitted to establish emission standards for new motor vehicles. Other states, however, may adopt and enforce California’s emission standards, in-lieu of federal standards. States that adopt California’s standards are referred to as “Section 177 states,” in reference to the CAA provision that grants this authority.

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