<unk> s <unk>  are<unk>  chemicals that have a high vapour pressure at room temperature. High vapor pressure correlates with a low boiling point, which relates to the number of the sample's molecules in the surrounding air, a trait known as<unk> ty.<unk> s are responsible for the odor of scents and perfumes as well as pollutants.<unk> s play an important role in communication between animals and plants, e.g. attractants for pollinators, protection from predation, and even inter-plant interactions. Some<unk> s are dangerous to human health or cause harm to the environment. Anthropogenic<unk> s are regulated by law, especially indoors, where concentrations are the highest. Most<unk> s are not acutely toxic, but may have long-term chronic health effects.
Volatile organic compound
Chemical substance
Bioactive compound
Biomaterial
Organochlorine compound
Immunogen
Biological agent
Polycyclic aromatic hydrocarbon