bluish gas; pleasant characteristic odor at concentrations less than 2 ppm; irritating and injurious at higher concentrations (dark blue as liquid below -180 degr. C)
Powerful oxidizing agent; unstable, explosive when warmed
Density = 2.144 g/liter
Melting point = -193 degr. C; Boiling point = -111.9 degr. C
Earth air conc. - 0.05 ppm; produced in outer layers of the atmosphere by the action of ultraviolet light on oxygen in the air.
