Threshold Limit Value (TLV)
Every country has its own TLV value that will set the standard of the indoor air quality in the plant. The TLV values in the field of coolant mist/smoke are given in mg/m3. The measurement is always taken in or near the breathing zone of the operator. This means that the TLV value will give information about how much coolant mist/smoke is acceptable for the operator to inhale.