In a new survey of noise levels of the New York City transit system, researchers at Columbia University found that exposure to noise levels in subways have the potential to exceed recommended guidelines of the World Health Organization (WHO). According to the research reported in the Journal of Urban Health, as little as 30 minutes of exposure to decibel levels measured in the New York City transit system per day has the potential to result in hearing loss. Noise exposure and noise-induced hearing loss is a global health problem of significant magnitude, especially in urban settings.
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