The best replacement for n2 is co2.

The best alternatives to n2 are rated as following:
★★★★★  co2
★★★★★  compressed air
★★★  co2 paintball
★★★  hpa
★★  umbraco
★★  log n
★★  o2 boiling point
★★  avic n3
★★  n3
★★  orchard
★★  p2
★  n
★  t50
★  b27
★  bacnet
★  r62
  avic n1
  n1
  canon sd900
  dsc w100
  compressed air paintball

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Google Trends

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n2
co2
compressed air