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美国商用运输车车辆杂志(commercial carrier journal)杂志最近的评论：美国的运输车队的经理们正面对2004年(对发动机制造商则是2002年10月1日起)执行的NOx排放降低50%的要求问题。美国环保署(EPA)认为，到2002年降低NOx至50%，可不用采取后处理措施，例如微粒过滤器或者触媒
Recent commerical commercial magazine magazine commentary: US fleet managers are facing a 50% reduction in NOx emissions in 2004 (with engine builders as of October 1, 2002) Ask questions The U.S. Environmental Protection Agency (EPA) believes that by reducing NOx to 50% by 2002, there is no need to take any afterthought such as particulate filters or catalysts