I think the real killer is more focused on noise from vehicles, airplanes, fireworks, manufacturing plants and construction sites. But the noisy neighbor can also lead to health issues due to a lack of sleep. Check out the link below to read the article from Fast Company.
Noise pollution is secretly killing you
By: Ariel Schwartz
Fast Company
April 1, 2011
Link: http://www.fastcompany.com/1744151/air-pollution-causes-europeans-to-lose-16-million-years-of-healthy-living-annually-study
Article was also featured in Multi Housing Professional magazine, in the March April issue. Page 20.