[boiling]

I have a random vinegar question.

I have some small cups of a white vinegar/water solution (about 3 to 1 water to vinegar) throughout my house to trap gnats. It's about 1 cup of total mixture in each trap, and probably 8 traps in an 1100sq foot space.

I noticed I had to refill these cups every couple of weeks due to evaporation (they have been out for about a month).

Is the vinegar/acetic acid itself evaporating or just the water?

At this concentration and volume, is it harmful to have this mixture out and evaporating into the air I breathe?
I had the thought today it could be harmful, even though lots of people use this as a way to get rid of flies, but I just wanted to check from a scientific perspective.

Thanks!

[Corribus]

Is the vinegar/acetic acid itself evaporating or just the water?

Both. Vinegar is about 95% water, depending on the strength. If you evaporate more than 5%, you know you're evaporating water. And if you can smell the vinegar, you know you are evaporating acetic acid.

At this concentration and volume, is it harmful to have this mixture out and evaporating into the air I breathe?

No. Considering that you can drink the stuff and people clean their floors with it....