Dynamap is a LIFE project aimed to develop a dynamic noise mapping system, able to detect and represent in real time the acoustic climate of road infrastructures. Dynamic noise maps are accomplished by simply scaling pre-calculated basic noise maps, prepared for different noise sources, traffic and weather conditions, as a function of the sound pressure levels detected by low cost monitoring sensors installed along the road network. The update of the noise maps is achieved through a WEB GIS software application able to read and process data coming from the system, and finally depict the noise values as coloured geo-referred noise maps in a user-friendly format. As one of the objectives of the project is to ease public information and communication on noise impacts, the use of a simpler indicator in addition to the traditional Leq was investigated. The development and approval of a noise index intended for the general public was at the heart of the European Life Environment Harmonica project, where innovative tools were developed to better inform the public about environmental noise and to help local authorities in the decision making process. To improve public comprehension on noise issues and impacts, the Harmonica project suggests the creation of a simple noise index. In this paper the application of the Harmonica Index to noise maps presentation is investigated and the results of preliminary tests are reported.