As part of a larger research project at the Stuttgart University of Applied Sciences, the relationships between road traffic, noise and air pollution were investigated. For this purpose, a total of nine pairs of sensors, each consisting of a noise sensor and an air quality sensor, were installed at three different locations on the façade of the first three floors of a multi-storey office building located directly on a four-lane road with two additional streetcar tracks. The sensors are used for the long-term recording of external noise and air quality pollution. In addition, a so-called TOPO box for radar-based traffic monitoring and vehicle classification (through axle detection and localisation of the engine using a microphone) was installed for both directions of travel. The relatively high buildings opposite the office building create a street canyon in which sound reflections play a significant role. In addition to the different measurement positions, correlations between the time of day and night as well as weekends and metrological influences, e.g. rain, are also considered. This paper presents initial analyses of the extensive investigations.