Which harmful gas is emitted by masonry building materials, even ground water? (a) H2S (b) Radon (c) Ammonia (d) CO2

Which harmful gas is emitted by masonry building materials,
even ground water?
(a) H2S
(b) Radon
(c) Ammonia
(d) CO2
by

1 Answer

Answer :

(b) Radon
by

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