The Oregon Department of Environmental Quality said today it was delaying enforcement of its Advanced Clean Trucks rule, which went into effect Jan. 1. “Effective immediately, Oregon DEQ will refrain from pursuing enforcement or assessing civil penalties against any manufacturer of medium- and heavy-duty vehicles (Classes 2b–8) who does not meet the specified [zero-emission vehicle] sales percentages,” DEQ director Leah Feldon wrote in a memo today…