Oxygen isn't flammable: https://www.thoughtco.com/flammability-of-oxygen-608783 https://www.thoughtco.com/flammability-of-oxygen-608783 If the oxygen concentra

Oxygen isn't flammable: https://www.thoughtco.com/flammability-of-oxygen-608783 https://www.thoughtco.com/flammability-of-oxygen-608783 If the oxygen concentration was high enough many things on the surface would burn (green plants, metal, etc.), but the air itself wouldn't. Things would probably rust like crazy too.