VOA? Voice of America?
I think you mean VOC.
Volatile Organic Compound.
Usually a molecule centered around Carbon,
With Hydrogen, Oxygen, Fluorine, Cl, Br, S, or N.
Think Love Canal, Fracking, MTBE, Gasoline, etc.
Now, since they failed to specify 'V.O.C.'s', I smell a Volatile Rat!
Show me the analysis!
The VOA appears to be a Bushel of Caca!