Noise: Occupational: Heaing Protection Selection LCeq - LAeq is less than or equal to 2: PNR = M - [(H - M)/4]x( LCeq - LAeq - 2) If LCeq - LAeq is more than 2: PNR = M - [(M - L)/8]x( LCeq - LAeq - 2) The PNR is subtracted from the LAeq ... noisenet.org