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Tier 3 (current standard)
The Tier 3 standards developed by the U.S. Environmental Protection Agency (EPA) were published on April 28, 2014. These standards entailed a phase-in from model year (MY) 2017. Full implementation is scheduled for MY 2025 and will reduce both tailpipe and evaporative emissions from passenger cars, light-duty trucks, MDPVs and classes of heavy-duty trucks.
Tier 3 standards are designed to be alligned with California´s state standards.
The Tier 3 standards represent a continuation of some of the elements featured in Tier 2:
    •Phased-in introduction of emissions standards: whereas Tier 2 had been implemented between MY 2004 through MY 2009, Tier 3 is to be phased in from MY 2017 through MY 2025
    •Utilization of the “bin” system concurrent to fleet-average requirements, in
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Tier 3 (current standard)