en

time weighted average

1

Terminological databases

EKI terminibaas Esterm

ID 713659 Last modified 30.12.2004
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Domain occupational diseasesmetrologyLabour - Employment - Working Conditions & Ergonomics
  • the time-weighted average concentration of a pollutant for a normal 8 hour working day or a working week of 40 hours, to which nearly all workers may be exposed day after day without adverse effect
aja-kaalu keskmine piirnorm
Usage examples
  • Ohtlike ainete piirnormide nimekirjas kasutatud mõisted Lühiajalise toime piirnorm - maksimaalne lubatud keemilise aine keskmine kontsentratsioon sissehingatavas õhus avaldatud aja-kaalu aritmeetilise keskmisena teatud lühikese perioodi (näit 15 min) jooksul. Lühiajaline kõrge ekspositsioonitase tuleb arvesse võtta summaarse ekspositsiooni määramisel lisaandmetena. Esitatakse ainetele, millel ei esitata andmeid piirnormi lae kohta. Piirnorm - ohtliku aine keskmine kontsentratsioon töökeskkonna sissehingatavas õhus tööpäeva (8h) ja töönädala (40h) jooksul, mis ei kahjusta tervist kogu tööstaaži kestel, kuid ei välista terviseriski, sest keemiliste ainete toime oleneb organismi individuaalsest eripärast. Piirnormi lagi - pidevalt 15 min jooksul lubatud aine maksimaalne kontsentratsioon õhus, mis määratakse kiiresti toimivate ainete jaoks. Ammoniaagi ja isotsüanaadi puhul on lubatud perioodiks 5 minutit.
time weighted average preferred
Usage examples
  • The task of the Committee shall be to supply the Commission with opinions at the latter's request on any matter relating to the toxicological examination of chemicals for their effects on health of workers. The Committee shall in particular give advice on the setting of Occupational Exposure Limits (OELs) based on scientific data and where appropriate shall propose values which may include: - the eight-hour time weighted average (TWA), - short-term limits/excursion limits (STEL), - biological limit values.
  • Time-weighted average (TWA) exposure limit is the time-weighted average concentration of a chemical in air for a normal 8-hour work-day and 40-hour workweek to which nearly all workers may be exposed day after day without harmful effects. Time-weighted average means that the average concentration has been calculated using the duration of exposure to different concentrations of the chemical during a specific time period. In this way, higher and lower exposures are averaged over the day or week.
TWA abbreviation

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