Crossword Genius

___-friendly (ecolabel)

Ross

I believe the answer is:

ozone

(Other definitions for ozone that I've seen before include "Bracing air (colloq.)" , "Layer that protects against ultraviolet rays" , "Sea-air" , "Gas that screens ultraviolet radiation" , "Kind of oxygen layer in atmosphere, has hole in it" .)

I've seen this clue in The New York Times.
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