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So how much noise does a cowbell make? Kings fans are famous for their cowbells! Answer: 110 decibels. A certified industrial hygienist measured the noise level of cowbells in 2012 when cowbells and air-powered horns were banned by the Winnipeg Blue Bombers. He measured the cowbell at 110 decibels at about 2 feet, and the air horn at 129 decibels -- enough to cause pain and temporary hearing impairment.