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In the recent years, it was documented that the main problem with the urban environment air quality in Bulgarian cities are the exceeded concentrations of fine particulate matter and associated human health related issues. With this, the need of gathering more detailed data and raising the city population awareness for the ambient conditions in close to their homes have grown. This paper presents an innovative measuring device, designed to raise the awareness of the population about ambient air quality in the urban environment. A main aim of the study was better understanding of the air flow through the prototyped device, in order to improve its performance with means of numerical simulations. To achieve the goal, two design versions of the protective box were assessed with CFD modelling. In the first one, there is a so-called "protective cavity" - a free volume of air prior to the main sensor position. In the second design, this cavity does not exist and the sensor contacts through extruded circular opening with the environment. A comparative analysis of the two variants is represented by velocity and relative pressure fields' visualizations. [ABSTRACT FROM AUTHOR]