sentences:  WVU found that "remaining for 30 seconds within the NTE zone can be quite difficult.The resulting low NTE availability poses a problem as many measurements within the NTE area have to be rejected along with those from outside the NTE area.The question arises if in this way all real-life emissions are sufficiently 'well reflected' in the NTE test results"
  
  A second issue of concern in the same vein is a case when an engine is compliant within the NTE zone, but exhibits elevated NOx at power levels just outside the NTE zone, or at idle.