The internal environment is the focus of this second article about designing for noise to improve well-being. According to several recent studies, noise in cities has become an increasing hazard to health. Environmental noise, that is, noise from traffic, industrial activities, or amplified music, which reaches internal spaces, is not merely an annoyance. It has been linked to cardiovascular disease, diabetes, dementia, and mental health issues. As the world urbanizes, more people are exposed to excessive levels of noise. In medium- and high-density housing, in office buildings, and in schools, noise pollution can emanate from internal as well as external sources.
