EPA Weighs Advance Notice For Heavy-Duty Truck NOx Rule Amid Delays

EPA is considering issuing an advance notice of proposed rulemaking (ANPR) to inform its forthcoming rule setting stricter nitrogen oxide (NOx) limits on heavy-duty trucks, a move that could let the agency claim some forward momentum this year as a formal proposal appears unlikely before California considers its own plan. The scope of such an ANPR -- and whether the agency will ultimately issue one -- is unclear. But California is expected to issue its own truck emissions proposal in...