title: NO2 (disambiguation)
text: # NO2 (disambiguation)
  
  $NO_2$ is nitrogen dioxide.
  
  $NO_2$ may also refer to:
  
  * Nitrite ion, $NO_2^−$
  * Nitronium ion, $NO_2^+$
  * $–NO_2,$ nitro group, characteristic of nitro compounds
  * $"NO_2",$ a song by American rock band Phish, from their album Phish
  