The fog is safe to breathe in general, but the fog should never be pointed direct at any person or animal. Don't keep pets in rooms where fog machines are in operation. Fog machines heat up, so it's best to keep children and pets away from the machines while it's in use.
The Fog Liquid itself works anywhere, but we recommend that our Fog Machines are operated only inside, so they can be protected from the elements. The machines have electronics that could be harmed by dust/dirt or moisture.
We have a smaller machine that only holds a little over a cup of the liquid. We’ve run it for several nights and haven’t used even half of that.
I do not know the ingredients but the label has a warning for people with allergic reactions to fog solutions. It does smell the same as a previous fog solution I used.