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www.universetoday.com/22603/mars-compared-to-earth

Mars is the 4th planet from Sun, and the place that holds our imagination because of the possibility that there might be life there. There are some similarities to Earth, like its day length ...

en.wikipedia.org/wiki/Atmosphere_of_Mars

The atmosphere of Mars has been losing mass to space throughout history, and the leakage of gases still continues today. The atmosphere of Mars is colder than Earth's. Owing to the larger distance from Sun, Mars receives less solar energy and has a lower effective temperature (about 210 K).

science.howstuffworks.com/mars5.htm

Mars has much less nitrogen (2.7 percent compared to 78 percent on Earth). It has very little oxygen (0.13 percent compared to 21 percent on Earth). The red planet's atmosphere is only 0.03 percent water vapor, compared to Earth, where it makes up around 1 percent.

hypertextbook.com/facts/2000/LaurenMikulski.shtml

These spacecraft provided scientists with most of the current data about Mars. The pressure at the surface of Mars is approximately 1 kPa and depends upon the Martian weather. Some sources don't give precise data, but only compare it to the earth's characteristics. Lauren Mikulski -- 2000

phys.org/news/2015-12-mars-earth.html

The reason for this is the low air pressure and lack of precipitation on Mars, which results in a very slow rate of erosion. However, this was not always the case. ... Mars compared to Earth. Your ...

mathscinotes.com/2012/10/earth-altitude-with-equivalent-pressure-to-mars

The surface pressure on Mars is equivalent to the range of pressures on Earth at altitudes between ~30 km and ~60 km. That seems like pretty thin atmosphere. Since humans require pressure suits for altitudes above ~19 km (called the Armstrong limit ), it looks like people will always be wearing pressure suits while walking about Mars.

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.

planetfacts.org/the-atmosphere-of-mars

The Atmosphere of Mars. Mars’ atmosphere is thinner compared to that of earth. The atmospheric pressure on Mars depends on how high or low the land is elevated. On Olympus Mon’s peak, Its pressure is at 30 pascals (0.0044 psi) and in the lowest point of Hellas Planitia it can get as high as 1,155 pascals (0.1675 psi).

www.universetoday.com/22587/atmosphere-of-mars

The atmosphere of Mars is less than 1% of Earth’s, so it does not protect the planet from the Sun’s radiation nor does it do much to retain heat at the surface. It consists of 95% carbon ...

phoenix.lpl.arizona.edu/mars111.php

Mars is only about one-half the diameter of Earth, but both planets have roughly the same amount of dry land surface area. This is because over two-thirds of the Earth's surface is covered by oceans, whereas the present surface of Mars has no liquid water.