I'm not an expert in environmental regulations, but designations like ULEV and ZEV seem to come from California and not the Feds. So in my opinion, this is whe

I'm not an expert in environmental regulations, but designations like ULEV and ZEV seem to come from California and not the Feds. So in my opinion, this is where the context is being misapplied - you want the CARB terminology to match the EPA. Neither one was handed down on stone tablets though.