Question: please explain Threshold Limit Values (TLVS) and give at least 3examples of TLVs and explain the difference between time-weighted average (TWA) and Short term exposure

please explain Threshold Limit Values (TLVS) and give at least 3examples of TLVs and explain the difference between time-weighted average (TWA) and Short term exposure limit (STEL) and how this relates to contaminant concentration

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