Noise

Moderate community noise, that is, levels above 55 decibels (dB), can contribute to a number of avoidable health conditions including interference with speech, impairments in attention, concentration, learning, and memory, poorer sleep, aggravation of high blood pressure, and greater risk of myocardial infarction. Elevated noise levels are challenging problems for high-density neighborhoods in San Francisco where noise levels frequently exceed 70 decibels. In the future, increases in urban density and associated increases in the proximity of commercial and residential will further challenge noise control and prevention.