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Identify the level and type of noise
Permissible noise exposure scale
85 dB 8 hours
88 dB 4 hours
91 dB 2 hours
94 dB 1 hour
97 dB 30 minutes
100 dB 15 minutes
103 dB 7.5 minutes
106 dB 3.75 minutes ( < 4 min)
109 dB 1.875 minutes ( < 2 min)
112 dB .9375 min ( ~ 1 min)
115 dB .46875 min (~ 30 Sec)

Are generally more durable than earplug

Identify the environment
Standard Decibel Levels

Faint Moderate Painful

80 81 83 85 88 97 98 100 108 110 116 117 121 135 140 158 161

Lathe Air Oxygen
Tabulator Milling Hammer Riveter Tourch
Cockpit, Farm Tractor Pain Shotgun
Cotton Prop Scraper Loader Threshold
Spinning
Newspaper Press
Compactor
Textile Loom Discomfort
Threshold

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