Oxygen Deficiency 3 : Medicine. An atmosphere having less than the normal percentage of oxygen found in normal air. Normal air contains approximately 21% oxygen at sea level
Internet gateway for occupational health and safety resources and information, Basic Safety and Health Terms (An Article dedicated to the novice health and safety professional, Sep. 2000), CA, USA 2000, http://www.osh.net/articles/archive/osh_basics_200 0_sept30.htm, (Hlth and Sfty - Amer) {108}
United States Department of Labor, Occupational Safety & Health Administration (OSHA), Personal Protective Equipment Glossary (OSHA 29 CFR 1910.132), Washington, DC USA 2012. http://www.osha.gov/dte/grant_materials/fy07/sh-16 625-07/ppeglossary3.pdf, (OSHA/ Pers Prot Equip - Amer) {498}