Kokomo, May 25 - An acoustics expert says a mysterious hum in Kokomo is almost gone.
The city hired the consultant to track down the source of the low-frequency noise that is blamed for making residents sick. He found that some of the noise came from a cooling fan on the roof of Daimler Chrysler's Kokomo Casting Plant.
He traced a similar tone coming from three air compressor units at Haynes International.
Officials at both companies made adjustments to bring down the noise levels.
