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The 75 dB(A) Threshold Level of the Physical Agents Directive: a flawed evolution

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Figure

Table 1: Values of L0 for each audiometric frequency
Table 2. Noise-induced permanent threshold shift, in dB, by ISO 1999 calculations.
Table 3. NIPTS (dB) at 4 kHz
Figure 1. This diagram appeared in the Environmental Protection Agency document of 1974 bearing the caption: “Exposure Level and Hearing Level as a Function of Population Percentile, Showing the 5 dB NIPTS Curve Merging with the PHS 4000 Hz Curve”

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