noun

• Oxides of nitrogen, especially as atmospheric pollutants.

  ‘targets to reduce NOx’

  More example sentences

  • ‘NOx emissions’
  • ‘As my passengers speak knowingly about performance features and NOx traps (nitrogen oxides are a nasty component of most fuel exhaust), I am fixated on the hydrogen sensors.’
  • ‘They also emit nitrogen oxides, or NOx, a key component of smog.’
  • ‘The harmful effects of NOx and carbon dioxide have not been calculated, but are probably lower than either SO2 or ozone.’
  • ‘Pacific Northwest National Laboratory researchers have developed a new cost effective and energy efficient method for reducing oxides of nitrogen, or NOx, in diesel engine emissions.’
  • ‘The system incorporates a catalyst to reduce NOx emissions as well as a particulate filter.’