Road Traffic (IMAGE) Barcelona Institute for Global Health (ISGlobal) Caption Road traffic is a major source of noise. Credit Nabeel Syed Usage Restrictions Credit appreciated: Photo by Nabeel Syed on Unsplash License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.