Mars currently has less than 1% of Earth's sea level atmospheric pressure.
Cusco is roughly 0.6atm of pressure.
So Cusco is a lot closer to use. Mars is essentially the Moon. Actually, it's worse than the Moon. Because all Mars's atmosphere dos is blow really annoying dust all over your equipment. Everything about Mars is the worst [1] eg specifically about the problems of landing on Mars:
> “It’s like this annoyingly middle value,” he said. “The atmosphere is thick enough to cause you all the problems you have on Earth, but too thin to really stop you like on Earth.”
Right, but the idea is that if you had an atmosphere with a higher partial percentage of O2 you could get by with far less inert gas filler, which makes terraforming a bit less daunting. You could imagine an atmosphere with 35% O2 at 0.3 atm being possibly habitable and requiring many trillion less tons of material added to Mars.
Cody's Lab has a few interestig videos about burning things in pure oxygen. For example https://www.youtube.com/watch?v=JlSeHSDc-Do So it's no so simple becuae you can't just ignore the 80% of nitrogen and use only the 20% of oxygen.
(IIR/UC the problem is that the nitrogen absorbs heat, so the pure 20% of oxygens burn things too easily.)
I'm not arguing that Mars atmosphere is close to Cusco. I'm responding to the parent comment implying that 1 atmosphere off pressure would be lost very quickly on Mars. Would this be the same for 0.6 or 0.5 atmospheres? If we could create such an atmosphere is a whole different discussion
Cusco is roughly 0.6atm of pressure.
So Cusco is a lot closer to use. Mars is essentially the Moon. Actually, it's worse than the Moon. Because all Mars's atmosphere dos is blow really annoying dust all over your equipment. Everything about Mars is the worst [1] eg specifically about the problems of landing on Mars:
> “It’s like this annoyingly middle value,” he said. “The atmosphere is thick enough to cause you all the problems you have on Earth, but too thin to really stop you like on Earth.”
[1]: https://fivethirtyeight.com/features/everything-about-mars-i...