The EPA is overhauling its $5bn Clean School Bus Program after its inspector general found weak oversight, including fraud risks, poor applicant verification, and inadequate monitoring of grant spending and bus deployment. In response, the agency has completed or is addressing 11 recommendations, adding tighter controls around verification, fund management, eligibility documentation, and financial guidance. With $2.37bn still unspent after awards to more than 1,100 districts, the relaunch will also seek input on biofuels, natural gas, and hydrogen, broadening the program beyond its earlier electric bus focus.