Health consequences of traffic noise can be fatal

Danish researchers tracked more than 50,000 50- to 64-year-olds enrolled in the study in 1993–97 and assessed their exposure to traffic noise and air pollution.

By 2006, 1600 cases of MI were identified. Residential exposure to road traffic noise was associated with a 12% higher risk of an MI for every 10-decibel increase in traffic noise volume.

The reason for this relationship is not yet known, but the authors said that it may be due to increased stress and sleep disturbances associated with high traffic noise.
PLoS One 2012; online 20 June