The Lazaretto test has proved results of reductions of NOx between 10% to 20%, while being as high as 40% close to the walls where PURETi Coat was applied. A higher reduction was found in the first 50 cm, which is the height of small children that can be most affected by the exhaust pipes of cars. Pollution reductions of 50% should be achievable with more surface treatment. To assess the effectiveness of the photocatalytic coating, a  state -of-the-art-modelling approaches such as computational Fluid Dynamics (CFD) was applied. Measuring was made with two official EU mobile laboratories The cost-benefit analysis reported in iSCAPE for photocatalytic coating indicates that photocatalytic coating is one of the most cost-effective passive control solutions against pollution. For example, in Bologna, Italy, the cost of air pollution reaches the figure of 300M € per year while the cost of applying PURETi there would not exceed €15M per year which equals in pollution reduction to planting one million trees.