Time-weighted Average: In air sampling, the average air concentration of contaminants during a given period.
Tolerance Petition: A formal request to establish a new tolerance or modify an existing one.
time-weighted average The average value of a parameter (e.g., concentration of a chemical in air) that varies over time.
tissue A group of similar cells.
threshold limit value-time-weighted average (TLV-TWA)
As defined by ACGIH, time-weighted average concentration for a conventional 8-hour workday and a 40-hour workweek, to which it is believed nearly all workers may be repeatedly exposed, ...
Action Level: An 8-hour time-weighted average of 85 decibels measured on the A-scale, slow response, or equivalently, a dose of fifty percent.
TLVs may be expressed in three ways: TLV-TWA-Time-weighted average, based on an allowable exposure averaged over a normal 8-hour workday or 40-hour workweek.
 See also: Site, Risk, Agent, Hazard, Environment
  
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