Tier (emission standard)

From Wikipedia, the free encyclopedia

Currently, vehicles sold in the United States must meet "Tier II" emission standards that went into effect in 2004. "Tier II" standards are currently being phased in—a process that should be complete by 2009. Within the Tier II ranking, there is a subranking ranging from BIN 1-10, with 1 being the cleanest (Zero Emission vehicle) and 10 being the dirtiest.

The former Tier 1 standards that were effective from 1994 until 2003 and were different between automobiles and light trucks (SUVs, pickup trucks, and minivans), but Tier II standards are the same for both types.

[edit] Tier 1

• TLEV – Transitional Low Emission Vehicle
• LEV – Low Emission Vehicle
• ULEV – Ultra-Low Emission Vehicle
• SULEV – Super-Ultra Low Emission Vehicle
• ZEV – Zero Emission Vehicle

[edit] Tier 2

Tier 2 existing variations are appended with "II",

• TLEV II – Transitional Low Emission Vehicle
• LEV – Low Emission Vehicle
• ULEV II – Ultra-Low Emission Vehicle
• SULEV II – Super-Ultra Low Emission Vehicle
• ILEV – Inherently Low-Emission Vehicle
• PZEV – Partial Zero Emission Vehicle
• AT-PZEV – Advanced Technology Partial Zero Emission Vehicle
• NLEV – National Low Emission Vehicle

[edit] See also

• GHG Vehicle Test Group
• Emission standard