ANSI American National Standards Institute. API American Petroleum Institute. Appearance and Odor May help you identify the substance you are working with. Do not rely on odor to indicate whether there is a substance in air. Some substances can reach hazardous levels without a noticeable odor.
Asphyxiation is one of the principal potential hazards of working in confined spaces.
ASTM American Society for Testing and Materials. The temperature at which a substance will ignite without the presence of an ignition source. Ranges are given for mixtures. BOM or BuMines Bureau of Mines of the U.S. Department of Interior. Carcinogen A substance or agent capable of causing or producing cancer in mammals.