Absorbing qualities of materials
The absorbing qualities of certain materials can be used to reduce the impact from sound, particularly in conjunction with unwanted source activities like roads1. An interesting and useful example is vegetated soil, but there are also other strategies under development in collaboration with acousticians2.
1Forssén, J., Kropp, W. & Kihlman, T.. Introduction to traffic noise abatement. In: Nilsson, M., Bengtsson, J. & Klæboe, R. (eds.) Environmental methods for transport noise reduction. Boca Raton: CRC Press (Imprint of Taylor & Francis), 2015.
2HOSANNA. Novel Solutions for Quieter and Greener Cities. Bandhagen: EU FP7, 2013.