The Environmental Protection Agency (EPA) has proposed a new set of greenhouse gas (GHG) emission standards for heavy-duty vehicles in Phase 3 which would take effect in model year 2027 and are designed to reduce GHG emissions and improve fuel consumption compared to current standards.
The proposed Phase 3 standards build upon the Phase 1 and Phase 2 standards already implemented. These are the latest in a series of regulations aimed at reducing GHG emissions from the transportation sector, which is the largest contributor of GHG emissions in the United States. The Phase 3 standards are also part of a broader effort by the Biden administration to combat climate change and transition to a cleaner energy economy as announced recently
On April 12, 2023, EPA announced a proposal to revise existing standards to reduce greenhouse gas emissions from heavy-duty vehicles in model year 2027 and set new, more stringent standards for model years 2028 through 2032.
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