The article presents Esmog Data, an immersive installation exhibited in the Balance-Unbalance International Conference held in Manizales, Colombia in 2016. The piece explores the visualization and sonification of urban environmental data. Esmog Data works transforming sensor readings of different toxic gases into perceptible stimuli (audio and computer graphics). While air quality is a local everyday community issue, the goal of the project is enhancing environmental awareness. In this regard, the work aims to create a meaningful context for interpreting scientific data of the urban territory.