In this action, EPA is finalizing new emission standards for nonroad diesel engines. The affected engines are used in most land- based nonroad equipment and some marine applications. The emission reductions resulting from the new standards will translate into significant, long-term improvements in air quality in many areas of the U.S. For engines in this large category of pollution sources, the standards for oxides of nitrogen and particulate matter emissions will be reduced by up to two-thirds from current standards. Overall, this program will provide much-needed assistance to states facing ozone and particulate air quality problems, which are causing a range of adverse health effects for their citizens, especially in terms of respiratory impairment and related illnesses. In compliance with the Paperwork Reduction Act, this document announces that the information collection requirements contained in this rule were approved by the Office of Management and Budget.