A study on an intervention in Mexico City to reduce air pollution by the use of titanium dioxide (TiO2), a mineral that creates a catalytic reaction in contact with sunlight. Placing "floating" public plazas coated with this material in the major intersections where most of the pollution accumulates and creating a clean air zone. In addition linking the Metro and Metro bus stations with elevated pedestrian and bike paths to increase the fluidity of the traffic at ground level and ensure the safety of pedestrians and bicyclists.