The Environmental Protection Agency made good on its promise to issue a final rule on heavy-duty truck tailpipe emissions by the end of the year, but the first take on the rule from engine manufacturers and trucking organizations is that compliance will be difficult.
The agency earlier this year proposed two options for drastically reducing nitrous oxide (NOx) emissions: a two-step process with standards getting progressively tighter in model years (MY) 2027 and 2031, or a one-step standard in...