An allowable exposure concentration averaged over a normal 8-h workday or a 40-h workweek.
Time Weighted Average. The yardstick used by the Occupational Safety and Health Administration (OSHA) to measure noise levels in the workplace. It is equal to a constant sound level lasting eight hours that would cause the same hearing damage as the variable noises that a worker is actually exposed to. (This hearing loss, of course, occurs over long-term exposures.) Same as LOSHA.
Time Weighted Average. The average concentration of a chemical in air over the total exposure time - usually an 8-hour work day (see " What are exposure limits?", Understanding Toxic Substances, page 22).
Acronym for ime eighted verage. The allowable exposure level for a pollutant over a given time period (8-hour day or 40-hour workweek, etc.)
Time Weighted Average. Usually expressed in exposure limits for 8hr per day or a 40 hr. work week. | Search | Help | Comments | Home
Time-weighted average. Varying concentrations of a contaminant averaged over the duration of the work activity.
is a time-weighted average concentration. It is a way of expressing exposure such that the amount of time spent exposed to each different concentration level is weighted by the amount of time the worker was exposed to that level.
The TLV expressed as a Time Weighted Average concentration for a normal 8-hour workday or 40-hour week.
Time weighted average. The TWA limit is the maximum average concentration to which an unprotected worker may be exposed over an eight hour working day. The TWA is computed as a simple arithmetic average of worker exposure projected over an eight hour day. Time weighted averages permit excursions above the TWA limit only as long as they: (1) Do not exceed the STEL or ceiling limit and (2) Excursions above the TWA must be compensated by equivalent excursions below the limit.
Time Weighted Average is the concentration for a normal 8-hour working day (40 hours/week) to which workers may be exposed without anticipated adverse effect.
Time-weighted average. The average concentration of a chemical in air over the total exposure time, usually eight hours. (See PEL and TLV.)
The Time-Weighted Average concentration is the average exposure concentration based on the duration of exposure to airborne concentration as it varies during an 8-hour workday.
Time-Weighted Average exposure is the airborne concentration of a material to which a person is exposed, averaged over the total exposure time-generally the total workday (8 hours). Also see TLV.
See TIME-WEIGHTED AVERAGE.
Time-Weighted Average for concentrations
Time-Weighted Average, the concentration of a chemical averaged or weighted over an 8-hour workday.
term used in the specification of Occupational Exposure Limits (OELs) to define the average concentration of a chemical to which it is permissible to expose a worker over a period of time, typically 8 hours. See "Exposure Limits"
The allowable time-weighted average concentration for a normal 8-hr workday or 40 hour work week.
