Amends the Diesel Emissions Reduction Act program by changing the text of a specific authorization subsection. This subsection typically governs how the Environmental Protection Agency’s diesel-emissions grant program is authorized (such as funding levels and years covered).

The file provided does not include the new wording, so details like dollar amounts, timelines, or policy adjustments are not shown. In practice, this kind of change usually extends or revises the program’s authorization so EPA and state partners can continue replacing or retrofitting older diesel engines, including school buses and heavy-duty vehicles, to cut air pollution.