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Posted by JDK on November 25, 2002 at 19:21:03 from (209.206.208.104):
How damaging are your work activities?
Chart lists common sounds in agriculture and their decibel ratings 0 dB – Lowest audible sound 50 dB – Quiet empty barn, babbling trout stream, gentle breeze 60 dB – Normal conversation 70 dB – Chicken coop, farrowing area 85 dB – Tractor or combine idling, barn cleaner, conveyor, elevator: You can begin to lose your hearing at this dB if you're exposed to it for eight (8) hours or more per day. 90 dB – Blower compressor, pneumatic wrench, chopping silage (no cab), full-throttle mower: If you are exposed to noises at this level for four (4) hours or more per day, hearing loss can occur. 100 dB – Tractor at 80% load, squealing sows, power tools, hand-held metal grinder: One hour of exposure per day is the limit at this decibel level. 110 dB – Average walkman set above the halfway mark, full-throttle combine, 10-HP vane-axial barn fan: Anything over 15 minutes exposure per day can cause damage. 120 dB – Thunderclap (near), sandblasting, bad muffler, old chain saw: The danger is immediate. 140 dB – Gunshot, engine back-fire, dynamite blast, jet engine. Any length of exposure time is dangerous and may actually cause ear pain. As noise gets louder, damage can occur sooner. There is no "cure" for hearing loss. This chart is only a guideline. Anything over 85 dB can be damaging to your hearing. Chart provided courtesy of the National Farm Medicine Center
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