This study deals with a sensor system involving a resistive copper phthalocyanine gas sensor and a nanocarbonaceous filter achieving the selective measurement of nitrogen dioxide in an environmental context. The assignments of the interactions between the oxidizing gases, ozone and nitrogen dioxide, and the filtering material selected from the studies developed in Part I are established. Raman spectroscopy, EPR and NEXAFS studies were performed in order to propose chemical mechanisms between gases and nanocarbons. This study allows the working method of the system to be implemented, leading to the improvement of the carbonaceous filter durability.