I am developing a map of the hums through out the US (over 500 points so far), and if possible keeping your confidentiality, can posters tell me at least the town and state they are hearing or feeling the sensations of the hum- that is idling diesel inside home, some hear it more as a "bizzing sound- and proven not tinnuitis", ear pressure, heaviness feeling like a bass speaker playing, tingly vibrations on the bottoms of your feet inside the home, heard inside a parked vehicle, etc.

Thanks