The best replacement for nitrogen is air in tires.

The best alternatives to nitrogen are rated as following:
★★★★★  air in tires
★★★  co2
★★★  oxygen
★★  air
★★  compressed air
★  argon
★  co2 beer
★  dry ice
★  phosphorus
★  nitrous
★  oxygen more electronegative
★  oxygen heavier
★  co2 keg
★  air for tires
★  helium
  bromine more electronegative
  carbon more electronegative
  oxygen molecule size
  sulfur more electronegative
  feh
  air which is heavier
  hpa
  carbon dioxide
  air tires
  helium exit bag
  air tyres
  regular air in tires
  beer gas
  hydrogen
  temperature
  chicago boss
  air tire
  nitrate
  tkn
  liquid helium
  argon gas
  hydraulic shocks
  air in auto tires
  nitrous oxide
  air in car tires
  c02
  compressed air paintball
  total nitrogen

Your alternative for nitrogen is not listed? Suggest!
Speaking about nitrogen, one probably shouldn't forget about 8 neutrons.

Other search terms related to nitrogen and their ratings are:
★★★★★ 8 neutrons
★★ 6 neutrons
★★ air in tires
★★ plants
★ glowing splint
airbags
You have in mind a companion for nitrogen and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of nitrogen in all years. Click on graph for more.
nitrogen
air in tires
co2