Symptoms also described in toxicological publications. (normal content in the air - 0,03%; 2% - first symptoms of poisoning, 5% - headache, 20% - death).
Sintomas din na inilarawan sa Toxicological publication. (Normal na nilalaman sa hangin - 0.03% 2% - unang sintomas ng pagkalason, 5% - sakit ng ulo, 20% - kamatayan).