The Cambridge Basic mask gives you protection from particulate pollution such as microscopic air particles, pollen and spores, dust, pathogens such as viruses and bacteria and smoke fumes
N99 rating guarantees consistent filtering of more than 99% of particles including PM10, PM2.5 and even PM0.3
Bacteria and viruses are drawn to the filament surface more efficiently because there is so much more available surface than in granular carbon. The activated carbon cloth traps the bacteria and draws out the gel-like cytoplasm inside killing it and preventing infection. Silver is added which helps to enhance these antibacterial/viral properties. Stops 99.6% of viruses and filters and kills 99.77% bacteria.