The atmosphere on Mars is mostly made of carbon dioxide. It is also 100 times thinner than Earth's atmosphere, so even if it did have a similar composition to the air here, humans would be unable to breathe it to survive.

Living on Mars cannot be considered entirely risk-free, in particular during the first few years. ... There is a chance that an astronaut might not survive if his or her Mars Suit were to become seriously damaged during a mission outside of the habitat. Certain medical conditions are not treatable on Mars.

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