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rock crusher decibel level bangladesh

Q400 noise dosimeters were set to moni­ tor an MSHA permissible exposure level PEL of 100 percent or an eighthour timeweighted average TWA8 of 90 dBA Specific parameters of this setting include Aweighting 90 dB Threshold and Criterion Levels 5­ dB Exchange Rate Slow Response and a 140 dB Upper Limit

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