A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from _________ ppm.

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Nisha Gupta

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📊 Environmental Engineering

Q. A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from _________ ppm.

(A) 1000 to 2000
(B) 3000 to 6000
(C) 6000 to 9000
(D) 10000 to 100000

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✅ Correct Answer: (D) 10000 to 100000

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