kahjuliku aine keskmine kontsentratsioon, mis 8-tunnise tööpäeva ja 40-tunnise töönädala korral ei põhjusta kahjulikku mõju kuitahes pika aja jooksul
as defined by ACGIH, time-weighted average concentration for a conventional workday and a workweek, to which it is believed nearly all workers may be repeatedly exposed, day after day, without adverse effect
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