Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by form]
6. [materials by chemical form]
7. compounds (materials)
8. organic compounds

Anotations

Scope note:

A class of toxic organic chemicals that readily evaporate as hydrocarbon gases. Volatile organic compounds (VOCs) are widely used as fuels, in the production of plastics, as solvents and paint thinners. Their emissions contribute to air pollution directly or in chemical reactions which form secondary pollutants such as ozone.