This bill, known as the Diesel Emissions Reduction Act of 2025 , aims to continue the federal program designed to reduce harmful emissions from diesel engines. Its primary purpose is to reauthorize the existing diesel emissions reduction program, ensuring its ongoing operation. The legislation achieves this by amending a specific section of the Energy Policy Act of 2005 . It extends the program's authorization period, changing the previous expiration date from 2024 to 2029 . This extension allows for continued funding and implementation of projects that reduce diesel emissions across the nation.