While some believe asbestos-related disease is a “threshold phenomenon,” which requires a certain level of exposure for disease to occur, others believe there is no safe level of asbestos.
Kui mõned usuvad, asbestiga seotud haigus on “künnise nähtus,” mis nõuab teataval tasemel kokkupuude haiguse esine, Teised usuvad, ei ole ohutut taset asbesti.