it is predicted that the general population, including susceptible individuals, could experience life-threatening health effects or death.”3

AEGL. See acute exposure guideline levels.

Aerosol. “A suspension of liquid or solid particles in a gas.”4

Alveolar macrophage. “One of the rounded, granular, mononuclear phagocytes within the alveoli of the lungs that ingest inhaled particulate matter.”5

ATSDR (Agency for Toxic Substances and Disease Registry). The ATSDR is an agency of the Department of Health and Human Services that was created by Congress under the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA), commonly known as the Superfund Act. Its mission is to serve the public by using the best science, taking responsive public health actions, and providing trusted health information to prevent harmful exposures and disease related to toxic substances. ATSDR defines minimal risk levels (MRLs) for hazardous substances.6

CAMS. See central atmosphere monitoring system.

CEGL. See continuous exposure guidance level.

Ceiling concentration. A concentration that shall not be exceeded during any part of a working day.7

Central atmosphere monitoring system (CAMS). CAMS monitors the submarine atmosphere by using an infrared spectrometer to measure carbon monoxide and a fixed-collector mass spectrometer to measure oxygen, nitrogen, carbon dioxide, hydrogen, water vapor, and fluorocarbons 11, 12, and 114.8

Chronic exposure. A repeated exposure lasting more than approximately 10%


NRC (National Research Council). 2001. Standing Operating Procedures for Developing Acute Exposure Guideline Levels for Hazardous Chemicals. Washington, DC: National Academy Press.


Hawley, G.G. 1981. The Condensed Chemical Dictionary, 10th Ed. New York: Van Nostrand Reinhold Company.


Dorland, N. 1988. Dorland’s Illustrated Medical Dictionary, 28th ed. Philadelphia, MD: W.B. Saunders Company.


See for more information.


29 CFR 1910.1000(a)(1) [online]. Available: [accessed May 5, 2009].


NRC (National Research Council). 1988. Submarine Air Quality. Washington, DC: National Academy Press.

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