The White House Office of Management and Budget began reviewing a final rule August 4 that could provide nonconformance penalties for Navistar Inc. The Environmental Protection Agency proposed a rule in January to allow the company to produce heavy-duty diesel engines that do not meet a NOx emissions standard if it pays penalties. At the same time, the agency issued a parallel interim final rule, but the U.S. Court of Appeals for the District of Columbia Circuit struck it down June 12 because the agency did not provide sufficient notice and comment. The final rulemaking is expected to satisfy those requirements.