<Table> Atmosphere of Mars <Tr> <Td_colspan="2"> Image of Mars with sandstorm visible, taken by the Hubble Space Telescope on 28 October 2005 </Td> </Tr> <Tr> <Th_colspan="2"> General information </Th> </Tr> <Tr> <Th> Chemical species </Th> <Td> Mole fraction </Td> </Tr> <Tr> <Th_colspan="2"> Composition </Th> </Tr> <Tr> <Th> Carbon dioxide </Th> <Td> 95.97% </Td> </Tr> <Tr> <Th> Argon </Th> <Td> 1.93% </Td> </Tr> <Tr> <Th> Nitrogen </Th> <Td> 1.89% </Td> </Tr> <Tr> <Th> Oxygen </Th> <Td> 0.146% </Td> </Tr> <Tr> <Th> Carbon monoxide </Th> <Td> 0.0557% </Td> </Tr> </Table> <Tr> <Td_colspan="2"> Image of Mars with sandstorm visible, taken by the Hubble Space Telescope on 28 October 2005 </Td> </Tr>

What is the composition of mars' atmosphere