However, the surface is not hospitable to humans or most known life forms due to the radiation, greatly reduced air pressure, and an atmosphere with only 0.16% oxygen. ... Human survival on Mars would require living in artificial Mars habitats with complex life-support systems.

How likely are we to live on Mars?

"We could have people on Mars by 2030 and a permanent manned base by 2040," Zubrin told me in 2018. ... "Very little that pertains to living on Mars in the early years will involve off-the-shelf equipment and supplies from Earth," writes Stephen Petranek in his book How We'll Live on Mars.

Can humans breathe on Mars?

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.