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

Abatement
Removal or controlling release of asbestos fibers. Includes operations and maintenance (O & M), encapsulation, enclosure, and removal.

Stage 1 Mesothelioma
Stage 1 mesothelioma affects one layer of the pleura only. It may have grown into the covering of the heart (pericardium) and the diaphragm

Crocidolite asbestos
One of the six types of asbestos. Crocidolite or "blue asbestos," is found in specialized high temperature applications.

Lethal Concentration(50) (LC50)
A calculated concentration of a chemical in air to which exposure for a specific length of time is expected to cause death in 50% of a defined experimental animal population.

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.

Laparotomy
Abdominal exploration is a type of surgery where the abdomen is opened (laparotomy) and explored (exploratory laparotomy) for examination and treatment of problems. Might be used in relation to asbestos disease problems.

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

ACTS
Asbestos Contractor Tracking System - Asbestos Demolition/ Renovation, and Asbestos Contractor Tracking System in some states is an EPA system

Asbestosis
A progressively restrictive fibrosis of the lung and is recognized as a disabling and fatal occupational disease.