The capability of measuring the concentration of gaseous analytes is of interest in different areas, from industrial safety to environmental monitoring. A wide variety of gasses is present in the atmosphere, produced both by industrial and natural processes. Their constant monitoring helps to prevent and analyze their effects on people, on the natural environment and on materials. The constant presence of polluting agents in urban areas promotes the interest in monitoring the indoor air quality inside workplaces, homes and public areas. For example, carbon monoxide and nitrogen oxides, generated in hydrocarbons combustion processes, are widely present in metropolitan locations. Moreover, several industrial processes imply the production of toxic gasses.