Possible answers to reduce and remove air pollutants, besides spending more time outdoor, are: adsorption, electrochemical oxidation processes and filtration . However, those technologies involve physical removal (therefore, requiring replacement), cleaning, and disposal of any consumable. Mineralisation of those pollutants into non-hazardous, or at least less hazardous compounds by means of photocatalysis is of great promise as a more feasible solution for their removal . Amongst the semiconductor materials used as photocatalysts, titanium dioxide (TiO2, titania), is still the most promising to remove harmful gases -Earthabundant, high oxidising power and resistance to photocorrosion, non-toxic, and cost-effective material.