<Table> Atmosphere of Venus <Tr> <Td_colspan="2"> Cloud structure in Venus's atmosphere in 1979, revealed by ultraviolet observations from Pioneer Venus Orbiter </Td> </Tr> <Tr> <Th_colspan="2"> General information </Th> </Tr> <Tr> <Th> Height </Th> <Td> 250 km (160 mi) </Td> </Tr> <Tr> <Th> Average surface pressure </Th> <Td> 93 bar or 9.3 MPa </Td> </Tr> <Tr> <Th> Mass </Th> <Td> 4.8 × 10 kg </Td> </Tr> <Tr> <Th_colspan="2"> Composition </Th> </Tr> <Tr> <Th> Carbon dioxide </Th> <Td> 96.5% </Td> </Tr> <Tr> <Th> Nitrogen </Th> <Td> 3.5% </Td> </Tr> <Tr> <Th> Sulfur dioxide </Th> <Td> 150 ppm </Td> </Tr> <Tr> <Th> Argon </Th> <Td> 70 ppm </Td> </Tr> <Tr> <Th> Water vapour </Th> <Td> 20 ppm </Td> </Tr> <Tr> <Th> Carbon monoxide </Th> <Td> 17 ppm </Td> </Tr> <Tr> <Th> Helium </Th> <Td> 12 ppm </Td> </Tr> <Tr> <Th> Neon </Th> <Td> 7 ppm </Td> </Tr> <Tr> <Th> Hydrogen chloride </Th> <Td> 0.1--0.6 ppm </Td> </Tr> <Tr> <Th> Hydrogen fluoride </Th> <Td> 0.001--0.005 ppm </Td> </Tr> </Table> <Tr> <Td_colspan="2"> Cloud structure in Venus's atmosphere in 1979, revealed by ultraviolet observations from Pioneer Venus Orbiter </Td> </Tr>

What is the composition of the atmosphere on venus
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