Figure 1. Idea sketch of solution using urban morphology and urban greening. In the left-hand model, both air ventilation and sound propagation are blocked, which can provide a good sound environment in the courtyard but poor air quality on the street side. In the right model a preliminary example of a solution where high levels of air pollution in the street can be transported by opening the building block. The position of the opening is selected with regard to the streets and the opening are acoustically absorbent by means of facade vegetation.