VOC WHAT? OFF GAS
VOC = Volatile Organic Compounds. They are essentially gasses that come off things like paint (and a tonne of other stuff) at room-temperature. They are not good. They lead to bad indoor air quality often referred to as "sick building syndrome". If you are exposed to enough of them you can get anything from headaches to, well, according the EPA some VOCs are suspected of causing cancer! You can usually smell them, they give carpets and furniture that "new" smell, permanent markers that distinctive "high" and strangely some air fresheners their fake "fresh" scent.