in safety threshold limit values, the concentration to which workers can be exposed continuously for a short period of time without suffering from (a) irritation, (b) chronic or irreversible tissue damage, or (c) narcosis of sufficient degree to increase the likelihood of accidental injury, impair self-rescue, or materially reduce work efficiency, and provided that the daily threshold limit value, time-weighted average (TLV-TWA) is not exceeded. [SEMI S2-93]
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