Hermio
Addicted to ArboristSite
Methane is not toxic to humans per se. But you can be asphyxiated due to lack of oxygen if too much methane is present. BTW, methane itself is odorless. But when manure emits methane, it also emits a lot of other stuff, most of which stinks. It is the sulfur compounds that stink the most. That is why they add mercaptans to natural gas supplies: so you can smell it if it leaks.Methane gas is a huge problem and it is a killer.