Sponsors (2)
The bill trades improved cold‑weather vehicle reliability and short‑term operational relief for operators (reducing stranded workers and downtime) against higher local emissions, weakened long‑term pollution protections, and added regulatory complexity that shifts health and economic burdens onto nearby communities and compliant businesses.
Transportation workers, utilities, emergency responders, and residents in cold regions can keep vehicles and equipment operating in extreme cold (avoiding derates/shutdowns and stranded crews), improving worker safety and reliability of critical services.
Small businesses, vehicle operators, and utilities that operate in prolonged freezing conditions face reduced downtime, fewer immediate retrofit costs or violations, and can use temporary cold‑weather modes or targeted DEF exemptions to maintain operations.
Regulated parties gain clearer rules about who and what is covered (including explicit identification of the EPA Administrator) and restrictions on who may suspend derate/shutdowns, which reduces some legal uncertainty and may limit misuse of suspension authority.
Communities near routes used by exempted or suspension‑eligible heavy vehicles (often rural or downwind areas) will likely face increased NOx and particulate emissions, raising respiratory illnesses and local health care burdens.
Prioritizing cold‑weather mobility exemptions risks weakening Clean Air Act implementation and setting a precedent that undermines long‑term nationwide pollution protections and environmental quality.
Narrow definitions and targeted exemptions could leave some vehicle and equipment types unregulated or create patchy coverage, concentrating harms on certain communities and creating uneven public‑health impacts.
Based on analysis of 5 sections of legislative text.
Directs EPA to allow temporary suspension of emission-related derates at ≤0°C and exempts certain vehicles north of 59°N from DEF system rules.
Introduced November 21, 2025 by Nicholas J. Begich · Last progress November 21, 2025
Allows the EPA to change Clean Air Act rules so diesel manufacturers can temporarily disable automatic engine derates or shutdowns caused by emissions-control faults when ambient temperatures are at or below 0°C, and to exempt certain vehicles from diesel exhaust fluid (DEF) system requirements year-round if they operate primarily north of 59° N latitude or face prolonged freezing that makes DEF impractical. The EPA must issue the regulatory revisions within 180 days and any cold-weather mode must end once temperatures rise above 0°C; otherwise Clean Air Act standards remain in force except for these two narrow exemptions.