The atmosphere of Mars is the layer of gases surrounding Mars. It is composed mostly of carbon dioxide. The Martian atmosphere consists of approximately 96% carbon dioxide, 1.9% argon, 1.9% nitrogen, and traces of free oxygen, carbon monoxide, water and methane, among other gases, for a mean molar mass of 43.34 g/mol. read more
The atmosphere on Mars consists of 96% carbon dioxide and less than 0.2% oxygen (Earth has about 21% oxygen). If astronauts tried breathing the air on Mars, they would quickly suffocate. read more