A ringed hydrocarbon (e.g. Ben zene)

Any material containing more than 1% asbestos.

American Society of Mechanical Engineers

A substance which can cause death by suffocation (lack of oxygen).

American Society of Safety Engineers

Above Ground Storage Tank

American Society for Testing & Materials

Atmosphere (@ sea level 29.92 inches Hg or 14,7 PSI).

The number of protons in the nucleus of an atom.

The relative mass of the atom on the basis of Carbon-12 (12C=12).

Agency for Toxic Substances & Disease Registry. Federal agency within the Public Health Service charged with carrying out the health related responsibilities of CERCLA and RCRA.

A geographic area in which levels of a criteria air pollutant meet the health based primary standard (National Ambient Air Quality Standard, or NAAQS) for the pollutant. An area may have an acceptable level for one criteria air pollutant, but may have unacceptable levels for others. Thus, an area could be both attainment and non-attainment at the same time. Attainment areas are defined using federal pollutant limits set by EPA.

The minimum temperature at which a material will ignite without a spark or flame present.

Aviation Gas

Air & Waste Management Association

Ambient Waste Quality Criteria

American Water Works Association

A solution that does not change composition when distilled. For example, if a 95% (w/w) ethanol solution in water is boiled, the vapor produced also is 95% ethanol and it is not possible to obtain higher percentages of ethanol by distillation.