Increasing levels of environmental noise pollution pose risks to public health. City noise mapping involves using GIS and acoustic analysis to model noise propagation across large urban areas. This helps governments understand noise impacts and mitigate health effects. Noise mapping can be done at regional and local scales. Regionally, it guides noise prevention and identifies quiet areas. Locally, it allows noise investigations for individual buildings to address impacts. SLR has extensive experience performing city noise mapping in Australia and Europe to predict transportation noise and its effects.