Tolerable limit of nitrogen oxides in air is __________ ppm. (A) 0.1 (B) 1 (C) 5 (D) 25

Tolerable limit of nitrogen oxides in air is __________ ppm.
(A) 0.1
(B) 1
(C) 5
(D) 25
by

1 Answer

Answer :

(C) 5
by

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