One-half the ACGIH TLV (or other exposure limit being used) will generally be used as the action level if an OSHA action level or PEL has not been established. An event such as a spill, leak or ...

At the University, the more conservative of either the OSHA-defined action level (generally one-half the PEL) or one-half the ACGIH TLV is used as the action level. Any substance which meets one of ...