Cancels the Environmental Protection Agency’s “Phase 3” greenhouse gas emissions standards for heavy-duty vehicles and declares that the EPA rule has no force or effect. In practice, the measure removes the federal regulatory requirements in that specific EPA rule, so manufacturers, truck fleets, and related industries would not be required to meet the standards set by that rule once the disapproval takes effect.

The action is narrowly targeted at a single EPA rule; it does not appropriate money, change tax law, or create new federal programs. The main impacts fall on vehicle and engine manufacturers, trucking and freight companies, drivers and fleet operators, air‑quality regulators, and communities affected by vehicle emissions.