Depends on the concentration you breath in as to which would cause a death first. I work in a plant that makes this product at a 99.5% concentration. I have been hit with it before due to equipment failure and was lucky enough to know what to do when it happened. Only resulted in a sore throat causing me not to be able to talk for a couple days. If you ever see a tanker with placards 1005 this is the product. If it is a wrecked tanker just keep distance call 911 and let them know they need hazmat. Nothing to mess with no matter what amount it is. There have been incidents where police have found this situation and tried to go save the driver and they died then other police show up and enter as well. It kinda sounds like that was the situation that took place here.
Good point. It is made from natural gas. The natural gas is turned into what is called syngas. Syngas is basically a form of hydrogen. The syngas is then heated and chilled while being converted to NH3. Once chilled it condenses to a liquid form. Depending on the pressure it is normally held at -35° up to 25° normally (more pressure=higher temperature). When loaded onto a tanker to send out for farm use it is raised to around 50° and around .2% ratio of water is added.