Permissible exposure limits -
Solvent			in parts per million (ppm)

Acetone				1000 ppm
Benzene				10 ppm
Dimethylformamide		10 ppm
Ethanol				1000 ppm
Ethylene dichloride		50 ppm
Methanol			200 ppm
Methyl chloride			50 ppm
Methyl  ethyl ketone		200 ppm
Nitromethane			100 ppm
Tetrahydofuran			200 ppm
Toluene				100 ppm
Xylene				100 ppm

Lower values indicate greater toxicity!