Refrigerant gas (7)

I believe the answer is:

ammonia

(Other definitions for ammonia that I've seen before include "Pungent gas used in cleaning liquids" , "Pungent cleaning fluid" , "Colourless pungent gas" , "Pungent gas formed of nitrogen and hydrogen" , "Smelling salts (NH3)" .)

I've seen this clue in the Sydney Morning Herald.

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