OAR 437-002-1053: Scope and Application

This subdivision applies to all occupational exposures to respirable crystalline silica in general industry and construction activities, except for the following: (1) Exposures that result from the processing of sorptive clays. (2) Operations where objective data demonstrates that employee exposures to respirable crystalline silica will remain below 25 micrograms per cubic meter of air (25 µg/m3) as an 8-hour time-weighted average (TWA) under any foreseeable conditions.