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
(TLV) ranges from __________ ppm.
(A) 1000 to 2000
(B) 3000 to 6000
(C) 6000 to 9000
(D) 10000 to 100000