1 Depending
on the duration of the inflammatory response, and the type of cells in the affected
tissue, inflammation due to exposure may be described as acute or chronic. Acute
exposure inflammation is rapid in onset with early and complete healing of the injured
area, and produced by locally irritant chemicals. In chronic inflammation, there
is persistence of the aggravating agent, such as insoluble particles, or continual
repetitive exposure to an irritant material. A characteristic of chronic inflammation
is that tissue destruction and the inflammatory process continue at the same time
that healing processes are in operation. (See Encycl. of Chem. Tox., Supplement
Vol. 1984). Back
2 The concentration value determined for a
contaminant reflects the Threshold Limit Value (TLV) for a Time Weighted Average
(TWA) set by the American Conference of Governmental Industrial Hygienists (ACGIH)
for 1986-1987. TLV-TWA standards under ACGIH are based on an eight-hour workday
and 40-hour workweek, and represent concentrations at which it is believed nearly
all workers may be repeatedly exposed without adverse effect. However, it is quite
common for sensitive or unacclimitized workers to experience adverse health effects
at concentrations well below accepted standards. Back
3 Freezers such as the Imperial model manufactured
by Northland Refrigerator Co., Greenville, Michigan (Eaton, 1985:93). Back |
