TLV values of four pollutants A,B,C and D are 2ppm, 9 ppm, 20 ppm and 50 ppm. Among these four pollutants which one is the most toxic pollutant ?

TLV values of four pollutants A,B,C and D are 2ppm, 9 ppm, 20 ppm and

1.	TLV values of four pollutants A,B,C and D are 2ppm, 9 ppm, 20 ppm and 50 ppm. Among these four pollutants which one is the most toxic pollutant ?
Answer» A B C D Solution :A