Ceiling Value CV : The ceiling value is the maximum permissible airborne concentration of a potentially toxic substance and is a concentration that should never be exceeded in the breathing zone
Heriot-Watt University, School of Life Sciences, Some Terms Used In Toxicology and Chemical Safety, Edinburgh, UK 1992. http://www.who.int/ipcs/publications/methods/harmo nization/en/compilation_nov2001.pdf, (Tox and Chem Sfty - Amer) {85}