<Tr> <Td> EU classification (DSD) (outdated) </Td> <Td> O T+ C Xi </Td> </Tr> <Tr> <Td> NFPA 704 </Td> <Td> 0 OX </Td> </Tr> <Tr> <Td_colspan="2"> Lethal dose or concentration (LD, LC): </Td> </Tr> <Tr> <Td> LC (lowest published) </Td> <Td> 12.6 ppm (mouse, 3 hr) 50 ppm (human, 30 min) 36 ppm (rabbit, 3 hr) 21 ppm (mouse, 3 hr) 21.8 ppm (rat, 3 hr) 24.8 ppm (guinea pig, 3 hr) 4.8 ppm (rat, 4 hr) </Td> </Tr>

Does ozone or oxygen contain a stronger bond