TLV 07 : Threshold Limit Value. A time weighted average concentration under which most people can work consistently for 8 hours a day, day after day, with no harmful effects
US Department of Labor, Occupational Safety & Health Administration (OSHA), OSHA Office of Training and Education, Glossary of Terms, Construction Safety and Health Outreach Program, DC, USA 1996. http://www.osha.gov/doc/outreachtraining/htmlfiles /hazglos.html, Washington, (OSH - Amer) {516}