Busy roads near buildings (IMAGE) Chalmers University of Technology Caption The Chalmers researchers' study has demonstrated a decline in work performance at noise levels as low as 40 dB. Near busy roads, it is difficult to achieve good indoor sound environments, even with well-insulated buildings and windows. Credit Pixabay Usage Restrictions No restrictions. License Public Domain 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.