Case file · High strangeness
The Kokomo Hum
After years of residents of Kokomo, Indiana, complaining of a low hum that caused headaches and nausea, an acoustic consultant's report in October 2003 traced two tones to local factories.
2003 CE · 40.49, -86.13 · status: explained
The account
The report found a 36 Hz tone from a cooling tower at the DaimlerChrysler casting plant and a 10 Hz tone from an air-compressor intake at Haynes International.
The sceptical view
Both were fixed, but some residents kept reporting the hum, as happens in other 'hum' towns.