Tier 4 Criteria Pollutant Standards, Part 1: Phase-In Schedule for Light-Duty and Medium-Duty Vehicles

The Natural Resources Defense Council, along with several other environmental organizations, opposes the EPA's proposed revision of Tier 4 criteria pollutant standards for light- and medium-duty vehicles. They argue the proposal is an unlawful "rollback" that retroactively weakens standards, violates the Clean Air Act's anti-backsliding mandate, and fails to adequately protect public health from dangerous emissions.

The South Coast Air Quality Management District, a regional air pollution control agency, opposes the proposed delay in Tier 4 criteria pollutant standards for light-duty and medium-duty vehicles. They argue that the delay will increase emissions in severe nonattainment areas and request that the EPA conduct a regional air quality impact analysis and a General Conformity determination.

The commenter, a diesel truck technician, opposes the proposed standards because they believe current emission systems cause frequent mechanical failures and high repair costs. They argue that reverting to Tier 2 standards would improve truck reliability and lower costs for the supply chain and consumers.

Our Children’s Trust, a law firm dedicated to representing children's rights, opposes the EPA's proposed delay of Tier 4 emission standards. They argue that the delay violates children's constitutional rights to health and safety by facilitating fossil fuel pollution and exacerbating the climate crisis.

The commenter supports the EPA's proposal to roll back emissions standards, arguing that current regulations lead to unreliable vehicles, high repair costs, and unnecessary financial burdens on Americans. They suggest that Tier 2 standards would be sufficient for environmental goals while significantly reducing costs.

Tim Allen, owner of a small construction equipment rental business, supports the EPA's proposal to roll back the proposed standards. He argues that the current rules are overly strict, costly to the economy and vehicle owners, and can lead to safety issues like "limp mode" in vehicles.

NMI Diesel supports the EPA's proposal to roll back emissions standards, arguing that current regulations make diesel vehicles unreliable and costly to repair. The commenter suggests that the EPA should put the final decision on hold to consider returning to Tier 2 standards, which they claim would achieve environmental goals at a significantly lower cost to consumers.

Ross Scarborough supports the EPA's proposal to roll back emissions regulations, arguing that current mandates make diesel vehicles unreliable and expensive to repair. The commenter highlights the high costs of emissions repairs and advocates for the right of vehicle owners to repair their own property.

Christopher Luca supports the EPA's proposal to roll back the vehicle emission standards, arguing that the current rules are overly strict. He states that the rollback would benefit his employer and protect consumer rights to repair vehicles.

Tyler Gloe, owner of G3 Transmission & Diesel, supports the EPA's proposal to roll back strict emissions rules. He argues that current regulations create prohibitively expensive repair costs for small businesses, farmers, and blue-collar workers, making functional vehicles economically unrepairable.