[SkyDancer]

And we breathe a mixture of chemicals in order to live any one of which individually would kill us so what's a little rust remover anyway?

• Nitrogen -- N2 -- 78.084% Oxygen -- O2 -- 20.9476%
• Argon -- Ar -- 0.934%
• Carbon Dioxide -- CO2 -- 0.0314%
• Neon -- Ne -- 0.001818%
• Methane -- CH4 -- 0.0002%
• Helium -- He -- 0.000524%
• Krypton -- Kr -- 0.000114%
• Hydrogen -- H2 -- 0.00005%
• Xenon -- Xe -- 0.0000087%
• Ozone -- O3 -- 0.000007%
• Nitrogen Dioxide -- NO2 -- 0.000002%
• Iodine -- I2 -- 0.000001%
• Carbon Monoxide -- CO -- trace
• Ammonia -- NH3 -- trace

[Stepan12]

Krypton -- Kr -- 0.000114%

Krypton? This is bad for Superman.