Environmental Protection Agency Administrator Lee Zeldin announced that the EPA is reviewing the emissions rulemaking put in place under the Biden-Harris administration. The important part for trucking comes from targeting the Greenhouse Gas Emissions Standards for Heavy-Duty Vehicles – Phase 3, or just Phase 3, rules, which began with model year 2027 trucks and extended through 2032.
Opponents to the rulemaking argued that the added emissions reduction requirements for nitrogen oxide would add tens of thousands of dollars to the cost of a new Class 8 tractor. Additionally, at the recent 2025 TMC annual meeting, the Commercial Carrier Journal reported, “Mike Tunnell, senior director of environmental affairs and research at American Trucking Associations, noted a modern diesel truck has seen a 99% reduction in NOx since 1973 and 99% in PM emissions since 1987.”
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