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Mars is known as the red planet. The planet itself is mostly rock. It is the thin atmosphere that is mostly carbon dioxide.
Venus
Mars has an atmosphere with low air pressure which is mostly carbon dioxide.
Venus has 96 percent of carbon dioxide
The inner planet that has an atmosphere containing mostly carbon dioxide is Venus. It has an extremely dense atmosphere, made up mostly of carbon dioxide with small amounts of nitrogen and trace amounts of other gases. The thick atmosphere contributes to Venus' extreme greenhouse effect, making it the hottest planet in the solar system.
Mars is the terrestrial planet with a thin carbon dioxide atmosphere. Venus also has an atmosphere of carbon dioxide, but it is very thick.
Venus has an atmosphere mostly of carbon dioxide and has a runaway greenhouse effect. Temperatures there are over 460 °C (860 °F).
Venus has the thickest carbon dioxide atmosphere.
Venus has a thick atmosphere composed mostly of carbon dioxide (CO2). This carbon dioxide is found throughout the atmosphere of the planet, with the highest concentration occurring in the lower atmosphere. It is estimated to make up about 96.5% of the atmosphere.
Such an atmosphere on a planet would be the result of carbon dioxide emitted from volcanoes.
That's MARS.
Mars, Venus's atmosphere is thicker than Earth's. Much thicker.