Overview of the National Low Emission Vehicle Program: Notes

Emission Reduction Stages: 

While OBD II has the function of monitoring for emission related faults and alerting the operator of the vehicle, the National Low Emission Vehicle Program requires a certain number of vehicles produced (specific to manufacturing totals) currently  comply with the following emission stages;

TLEV  : Transitional Low Emission Vehicle

LEV:  Low Emission Vehicle

ULEV:  Ultra Low Emission Vehicle.

Prior to the National Low Emission Vehicle Program, the most stringent exhaust reduction compliancy is what is known internally within BMW as HC II  . The benefit of exhaust emission reductions that the National Low Emission Vehicle Program provides compared with the HC II standard is as follows:

TLEV-  50% cleaner.

LEV-  70% cleaner.

ULEV  -84% cleaner.

• Compliance Level
• NMHC Non Methane Hydrocarbon
• CO Carbon Monoxide
• NOx Oxide(s) of Nitrogen
• TLEV
• 0.250
• 3.4
• 0.4
• LEV
• 0.131
• 3.4
• 0.2
• ULEV
• 0.040
• 1.7
• 0.2
• Compliance Level
• NMHC Non Methane Hydrocarbon
• CO Carbon Monoxide
• NOx Oxide(s) of Nitrogen
• TLEV
• 0.125
• 3.4
• 0.4
• LEV
• 0.075
• 3.4
• 0.2
• ULEV
• 0.040
• 1.7
• 0.2
• Compliance Level
• NMHC Non Methane Hydrocarbon
• CO Carbon Monoxide
• NOx Oxide(s) of Nitrogen
• TLEV
• 0.156
• 4.2
• 0.6
• LEV
• 0.090
• 4.2
• 0.3
• ULEV
• 0.055
• 2.1
• 0.3