Threshold limit value (TLV) means maximum permissible/acceptable
concentration. TLV of phosgene in air is about __________ ppm (parts per
million).
(A) 0.002
(B) 0.2
(C) 1.2
(D) 4.8
concentration. TLV of phosgene in air is about __________ ppm (parts per
million).
(A) 0.002
(B) 0.2
(C) 1.2
(D) 4.8