The invention relates to a composition for mineralising carbon dioxide and nitrogen oxide gases, which comprises a mixture of magnesium (between 1 and 25%), iron (between 1 and 23%), calcium monoxide (between 1 and 25%), titanium dioxide (between 0.1 and 11%) and silicon dioxide (between 16 and 75%), with a particle diameter between 100 nm and 4000 μm. The composition causes the mineralisation of carbon dioxide (CO2) and of the gaseous chemical compounds known as “nitrogen oxides” (NOx) in the atmosphere. This composition can be added or mixed as an additive in paints, dyes, resins and elastic polymers (gum and natural rubber) in parts with wear, and for any type of covering.