Sponsors (4)
The bill prioritizes preventing cold‑weather engine failures and ensuring continuity of transport and services in very cold regions—benefiting drivers, emergency responders, and rural communities—at the cost of higher local emissions, potential setbacks to regional air‑quality goals, and risks of uneven enforcement and environmental inequities.
Rural residents, emergency responders, and transportation workers will face fewer cold‑weather engine shutdowns and related life‑threatening failures because the bill allows operational flexibility in extreme cold.
Owners and operators of covered vehicles/equipment (including small businesses and utilities) can maintain service continuity—deliveries, public services, and critical infrastructure—during freezing conditions via temporary cold‑weather modes and targeted DEF exceptions.
Manufacturers and fleet operators (including small fleets) can avoid costly redesigns, reduced performance, or extra maintenance caused by cold‑triggered derates/shutdowns, lowering downtime and immediate compliance expenses.
Rural residents and workers near exempted vehicles will face higher local air pollution and greater respiratory and other health risks because the bill allows suspension or relaxation of emissions controls in cold conditions and certain regions.
Regional and national air quality goals could be undermined as exemptions and looser cold‑weather rules reduce NOx and other emissions controls, set precedents for weaker standards, and slow progress on pollution reduction.
The bill creates uneven regulatory burdens and potential environmental injustice by exempting fleets north of 59°N or in cold modes while other communities remain subject to full controls.
Based on analysis of 5 sections of legislative text.
Directs EPA to allow cold-weather suspension of emissions derates/shutdowns at ≤0°C and to exempt vehicles north of 59°N from DEF requirements when DEF is impractical.
Introduced November 6, 2025 by Daniel Scott Sullivan · Last progress November 6, 2025
Allows the EPA to change Clean Air Act rules so diesel vehicle and engine makers can temporarily disable emissions-related engine derates or shutdowns when ambient temperature is at or below 0°C, and to grant a year‑round exemption from diesel exhaust fluid (DEF) system requirements for vehicles that operate primarily north of 59°N or in conditions where DEF use is impractical. The changes are aimed at preventing loss of vehicle function and protecting safety in very cold, remote areas while preserving all other emissions standards except for these two limited exceptions. The EPA must adopt the regulatory revisions within 180 days of the law taking effect and ensure engines return to normal emissions-control behavior above 0°C; the bill explicitly preserves Clean Air Act emissions standards except for the authorized cold-weather operational mode and the DEF-system exemption.