õhus olev kaalutud keskmine maksimaalne kahjulike ainete kogus, mida loetakse keevitaja tervisele kahjutuks; lubatakse lühiajalist vähest normi ületamist
the maximum average airborne concentration of a hazardous material to which healthy adult workers can be exposed during an 8-hour workday and 40-hour workweek - over a working lifetime - without experiencing significant adverse health effects
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