This uncoated Titanium Dioxide (TiO2)-based filter has a unique lattice structure, which provides protection from environmental pollutants unparalleled by any UV filter commercially available. Optisol OTP-1 is doped with Manganese Dioxide (MnO2), and this provides the product with its key functional capabilities. MnO2 present in the internal structure reduces photoactivity, thus mitigating the generation of free radicals upon UV exposure, whilst MnO2 present in the external structure aids in free radical scavenging and quenching of gaseous pollutants.