Hazardous gas

This time we are looking on the crossword puzzle clue for: Hazardous gas.
it’s A 13 letters crossword definition.
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Possible Answers:

RADON.

Last seen on: –LA Times Crossword, Tue, Feb 7, 2023
Newsday.com Crossword – Apr 24 2022 Crossword Answers
L.A. Times Daily Crossword – Mar 15 2022
Thomas Joseph – King Feature Syndicate Crossword – Dec 19 2020
NY Times Crossword 3 Nov 20, Tuesday
LA Times Crossword 30 Oct 19, Wednesday