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en.wikipedia.org/wiki/Atmosphere_of_Mars

The atmosphere of Mars is the layer of gas surrounding Mars. It is primarily composed of carbon dioxide (94.9%), molecular nitrogen (2.6%) and argon (1.9%). It also contains trace levels of water vapor, oxygen, carbon monoxide, hydrogen and other noble gases. The atmosphere of Mars is much

astronomy.stackexchange.com/.../where-does-the-co2-in-mars-atmosphere-come-from

Venus and Mars have both lose most of their lighter gases, H20, CH4, NH3 but CO2 is heavy enough to have been retained by both those planets, though it's worth pointing out that we don't know how much CO2 Mars had millions and billions of years ago. Mars may have lost much of it's CO2 over time as well.

www.space.com/16903-mars-atmosphere-climate-weather.html

Mars is a planet that shows climate change on a large scale. Although Mars' atmosphere used to be thick enough for water to run on the surface, today that water is either scarce or non-existent.

www.astronomy.com/news/2018/07/terraforming-mars-is-a-no-go

Carbon dioxide, a greenhouse gas, is abundant on Mars — its thin atmosphere is made of the stuff, and the white stuff we often see on the surface is dry ice, not snow. ... surveyed how much ...

www.answers.com/Q/How_many_percent_of_carbon_dioxide_in_mars

Mars' atmosphere contains mainly carbon dioxide, which means that in order for the oxygen/carbon dioxide cycle to occur, Mars has to go through the same procedures that Earth went through.

www.answers.com/Q/How_much_oxygen_is_in_Mars'_atmosphere

Mars has an atmosphere, though it is different than our atmosphere here on Earth. The atmosphere of Mars is thin, cold, and dry and contains much less oxygen than the atmosphere of Earth.

www.quora.com/How-much-pressure-is-the-atmosphere-on-Mars

How much pressure is the atmosphere on Mars? The pressure is low, at about 1% of Earth’s atmospheric pressure, but fortunately that is enough to slow probes and facilitate the use of parachutes. Mars lander pictured from orbit Artwork: Twelve thru...

answers.yahoo.com/question/index?qid=20080129122900AASGZDZ

Best Answer: Mars has a very thin atmosphere (~1% earth's atmosphere), and though the composition is close to 95-97% carbon dioxide, the tenuous nature of this atmosphere prevents very much infrared radiation from being trapped. Another issue comes in the winter months when the temperature drop is such that CO2 falls out the atmosphere in high enough volumes to drop the barometric pressure to ...

earthscience.stackexchange.com/questions/9857/carbon-dioxide-on-mars-venus-and...

Earth's atmosphere is 60 times denser than that of Mars; Venus's atmosphere is over 3000 times denser. With such a thin atmosphere on Mars, there is little atmospheric mass to retain heat, despite the atmosphere being composed of 95.3 percent carbon dioxide.

science.howstuffworks.com/mars5.htm

Of all the planets, Mars is our closest relation in terms of makeup (not distance -- Venus is closer), but that's not saying much.And it certainly doesn't mean that it is hospitable. The atmosphere of Mars differs from Earth's in many ways, and most of them don't bode well for humans living there.