The air on Mars would kill a human quickly. The atmosphere is less than 1% of Earth’s, so it would be hard to breath. What you would have available to your lungs would be undesirable to say the least. The air on Mars consists of 95% carbon dioxide, 3% nitrogen, 1.6% argon, and the remainder is trace amounts of oxygen, water vapor, and other gases.
On Earth, oxygen accounts for an average of 21% of the air that we breath. Humans can survive on lower concentrations, but not much lower. Oxygen is spread throughout our bodies by our red blood cells and our bodies thrive. The high concentration of carbon dioxide in the Martian atmosphere would replace oxygen in our red blood cells and the average human would die in less than 3 minutes if left unprotected on the surface. Of course, that assumes that air quality is the only factor considered. The cold and other factors would probably kill someone faster than the poor air quality.
We think of Mars as a dry, dead planet. That is fairly accurate, but at night the planet achieves 100% humidity. During the day it is very dry, here is why. Humidity is the amount of water vapor in the air. It varies daily and depends on the temperature: warm air can hold more water vapor than cold air . Humidity is measured as a percentage of the maximum amount of water that the air can hold at a given temperature. The greater the difference between the two temperatures, the greater the evaporation. When there is a lot of evaporation, the air is drier and the humidity is low. On Mars, the air is saturated (100% humidity) at night, but undersaturated during the day. This is because of the huge temperature difference between day and night.
The air on Mars was much different early in the history of the Solar System. Many scientists believe that the planet was warm and had a thicker atmosphere. Unfortunately, the planet lacked two important ingredients: plate tectonics and a magnetic field. Had those developed, Mars could have developed enough oxygen to support lifeforms similar to those on Earth.
The air on Mars is a major deterrent to human exploration of the planet. Here is a link to a video showing a Russian experiment to overcome this challenge. For now, poor air quality and nearly two years in space will keep humans pondering manned flight to the planet, but who knows what the future will hold.
Nasa is planning to make oxygen from the atmosphere on Mars when its next robot arrives on the mysterious red planet in 2020.
Scientists will send microbial life - possibly algae or bacteria - on the 2020 Rover mission in a bid to create air fit for human consumption.
They aim to feed the microorganisms in Martian soil in the hope that they will pump out oxygen as a byproduct.
It could then be made available for breathing or used as rocket fuel to power return flights to Earth.
If the experiment is successful it will mark a major step towards making Mars habitable for human colonies in the future.
Mars's atmosphere contains just 0.13% oxygen, compared with 21% on Earth.
Nasa Acting Chief Administrator Robert Lightfoot told Futurism: "Mars 2020, has an experiment where we are going to try and actually generate oxygen out of the atmosphere on Mars, clearly that’s for human capability down the road."
The US government department also has plans to build a magnetic shield around Mars and to install a nuclear reactor on the planet.
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