There are different kinds of vehicles. it's actually dust because Mars is known to have Strong winds that tends to lift a lot of dust off the ground.
The atoms on Mars consist of Protons and Electrons. The atmosphere of Mars is known to be primarily composed of carbon dioxide, molecular nitrogen and argon. It has been found to have some little amount of water vapor, oxygen, carbon monoxide, hydrogen and noble gases.
A high percentage of water on Mars exists in form of ice, though it is said to exists in small quantities in vapor form in the atmosphere.
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