The epidemic began in Bellingham, Washington which is located here.

The Seattle Windshield Pitting Epidemic is a phenomenon which affected Bellingham, Seattle, and other communities of Washington state in April, 1954; it is considered an example of a mass delusion. It was characterized by widespread observation of previously unnoticed windshield holes, pits and dings, leading residents to believe that a common causative agent was at work. It was originally thought to be the work of vandals but the rate of pitting was so great that residents began to attribute it to everything from sand flea eggs to nuclear bomb testing.

• http://en.wikipedia.org/wiki/Seattle Windshield Pitting Epidemic