mainly nitrogen

What Are The 5 Main Components Of Air? Nitrogen — 78 percent. Oxygen — 21 percent. Argon — 0.93 percent. Carbon dioxide — 0.04 percent. Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapor. What are the components of air *? Nitrogen – 78% Oxygen – 21% Carbon dioxide –