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

/ Chemical Environmental Engineering / By
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