The time-weighted average is a limited concentration specified in the threshold table established by the American Association of Governmental Industrial Hygienists (ACGIH). Refers to the average concentration of the normal 8-hour working day or a 40-hour working week based on the time of exposure to harmful substances. It is the allowable limit, but there must be a corresponding compensation time below the limit during the working day. This limit does not apply to substances that are acutely active.
Calculated by this formula: \(time-weighted average concentration = (C1T1 + C2T2 + ... + CiTi) ÷ 8 (h) \)
Where: C is the contact concentration (ppm); T is the continuous contact time (h).
Concentration 1: 20
Time 1: 1 hour
Concentration 2: 45
Time 2: 1.5 hours
Concentration 3: 50
Time 3: 1.5 hours
Concentration 4: 60
Time 4: 2 hours
Concentration 5: 45
Time 5: 2 hours
Input total time: 8 hours
Click "Calculate" to output the result.
Time weighted average: 46.525
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