Crossword Genius

Allotropic form of oxygen in the atmosphere (5)

Ross

I believe the answer is:

ozone

(Other definitions for ozone that I've seen before include "lively atmosphere" , "A poisonous gas; seaside air" , "Kind of oxygen layer in atmosphere, has hole in it" , "Bracing air of old, now seen as potentially toxic" , "Invigorating air of the seaside" .)

I've seen this clue in The Telegraph.
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