Isnt Another Fire News Today

Think -- well limit the chances that there could be another explosion. >> kevin, a significant levels of co -- >> can you go over the acceptable levels again the co, hydrogen, and how long would one ventilation hole it would take. >> if we were working in a coal mine, we would not want to work in greater than 50 parts per million of co and we would not want to work in less than 19.5% oxygen, and we would not want to work in greater than 1% methane. hydrogen in a normal mine is zero. so were deal...