Minimal Risk Level (MRL)
An estimate of daily human exposure to a hazardous substance that is likely to be without an appreciable risk of adverse noncancer health effects over a specified route and duration of exposure.

Amosite
A type of asbestos in the amphibole group; it is also known as brown asbestos.

Stage 4 Mesothelioma
Stage 4 mesothelioma has spread via the bloodstream to other organs in the body such as the liver, brain or bone or to lymph nodes on the other side of the chest

Risk Ratio
The ratio of the risk among persons with specific risk factors compared to the risk among persons without risk factors. A risk ratio greater than 1 indicates greater risk of disease in the exposed group compared to the unexposed.

Permissible Exposure Limit (PEL)
An Occupational Safety and Health Administration (OSHA) allowable exposure level in workplace air averaged over an 8-hour shift of a 40 hour workweek.

Immunologic Toxicity
The occurrence of adverse effects on the immune system that may result from exposure to environmental agents such as chemicals.

Bronchial Lung Cancer
Malignant tumor of the bronchial tubes, this disease is more common than Asbestosis & Fibrosis.

Fibrosis
A condition marked by the increase of connective, fibrous tissue.

Intermediate Exposure
Exposure to a chemical for a duration of 15-364 days, as specified in the Toxicological Profiles.

Excursion Limit (EL)
1 Fiber per cubic centimeter averaged over a 30 minute sampling period.