Greenhouse Gas Emissions Standards and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles - phase 1

Source: International Energy Agency
Last updated: 23 February 2026

The US Environmental Protection Agency (EPA) and NHTSA enacted in 2011 greenhouse gas standards for heavy-duty vehicles for model years 2014 through 2018. The first phase of Vehicle and Engine Performance standards cover tractors, vocational vehicles and pickups/vans. 

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