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In addition to the definitions concerning states, the other terms used to
describe degree of exposure include:
- ppm:
- Parts per million (parts) of contaminated air on a volumetric basis. Usually used for
expressing the concentration of a gas or vapor
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- mg/m3:
- Milligrams of a substance per cubic meter of air. Most commonly used for expressing
concentrations of dusts, metal
fumes, or
other particles in the air
 mg/m3
mppcf:
Millions of particles of a particulate
per cubic foot of air. This term is not widely used today
f/cc:
The number of fibers per
cubic centimeter of air. Used for expressing the concentration of airborne asbestos
fibers.
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