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

Dr. Wendy J. Bernstein, a community psychiatrist, opposes the proposed delay in implementing Tier 4 Criteria Pollutant Standards. She argues that delaying these standards will result in millions of vehicles continuing to emit harmful pollutants that damage human health, particularly for marginalized communities and children.

MEMA, a trade association representing vehicle suppliers, supports the EPA's proposal to delay certain Tier 4 NMOG+NOx requirements by one to two years to provide compliance flexibility for customers. However, they emphasize that such delays impact supplier investments and strongly advocate for maintaining the existing Tier 4 particulate matter standards.

Toyota Motor North America, Inc. supports the EPA's proposal to delay the Tier 4 standards and requests a further one-year extension to 2029 to allow for better evaluation of technology feasibility. The company argues that current standards are based on unrealistic BEV market projections and advocates for performance-based standards that preserve consumer choice and affordability.

The International Council on Clean Transportation (ICCT) opposes the EPA's proposed delay of the Tier 4 Criteria Pollutant Standards for light-duty and medium-duty vehicles. They argue that automakers have sufficient lead time and technology to comply with the existing 2024 standards, and they contend that the EPA's cost estimates for emission controls are overstated.

The International Council on Clean Transportation (ICCT) opposes the EPA's proposed delay of the Tier 4 Criteria Pollutant Standards for light-duty and medium-duty vehicles. They argue that automakers already have the technology and lead time to comply, and that the EPA's cost estimates for emission controls are significantly overstated.

The International Council on Clean Transportation (ICCT) opposes the EPA's proposed delay of the Tier 4 Criteria Pollutant Standards for light-duty and medium-duty vehicles. They argue that automakers already have the technology and lead time to comply, and that the EPA's cost estimates for emission controls are significantly overstated.

The International Council on Clean Transportation (ICCT) opposes the EPA's proposed delay of the Tier 4 Criteria Pollutant Standards for light-duty and medium-duty vehicles. They argue that automakers are already well-positioned to comply with the existing 2024 standards and that the EPA's cost and lead-time estimates are inaccurate.

A coalition of environmental and policy organizations opposes the proposed rule, arguing that it weakens emissions standards for light- and medium-duty vehicles. They contend that the EPA is arbitrarily ignoring well-established scientific estimates of the human health impacts and monetary costs of particulate matter and ozone pollution.

WE ACT for Environmental Justice, representing the Clean Air for the Long Haul and the Environmental Justice Leadership Forum, opposes the proposed delay of the Tier 4 vehicle emissions standards. They argue that the delay to the 2024 standards (reverting to 2014 Tier 3 standards) disproportionately harms low-income communities and people of color by postponing critical public health benefits and ignoring the real-world health costs of continued pollution.

The commenter, identifying as a private individual, strongly opposes the proposed rollback of Tier 4 criteria pollutant standards for light-duty and medium-duty vehicles. They argue that the proposal is a retroactive and illegal move that prioritizes industry profits over public health, specifically citing the risks of increased asthma and respiratory issues. Additionally, the commenter claims the EPA violated procedural requirements by failing to include necessary manufacturer data in the docket and by ignoring statutory mandates regarding environmental and human health impacts.