Metro consultants confirm resident fears regarding noise and vibrations

  • Published in Local

metro logoA consulting firm hired by Metro has confirmed local residents’ concerns about Metro’s new 7000 series trains – they are louder than the old ones and may have a tendency to vibrate more, shaking nearby homes.

Consultants from Wilson Ihrig, the firm Metro hired for the study, said in the report posted online March 24 that in all but one residential site tested, vibration from the trains was higher for the 7000 series, than the older ones. The study concluded this by measuring ground-borne vibration in houses a few hundred feet from the track centerline when a train passed by.

The report’s authors said some Metro trains violated the organization’s design criteria by go over the recommend vibrations for nearby homes.


NIH finds adults suffer hearing loss

  • Published in News

BETHESDA -- The National Institutes of Health (NIH) and Center for Disease Control (CDC) have found that approximately a quarter of adults within a certain age range suffer from noise-induced hearing loss.

Results indicate that 24 percent of adults aged 20 to 69 experience hearing loss at high frequencies, in what the National Institute of Deafness and Other Communications Disorders (NIDCD) terms as a noise notch.

“Of the 24 percent of adults with an audiometric notch suggestive of noise-induced hearing loss, 6 percent had a notch in both ears, and 18 percent had a notch in only one ear,” said Howard Hoffman, a coauthor on the study and director of the NIDCD’s Epidemiology and Statistics Program.

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