kahjuliku aine piirkontsentratsioon, mida peetakse teatud lühiajalise mõju korral töötajatele üldiselt ohutuks
as defined by ACGIH, concentration to which it is believed that workers can be exposed continuously for a short period of time without suffering from (1) irritation, (2) chronic or irreversible tissue damage, or (3) narcosis of sufficient degree to increase the likelihood of accidental injury
