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FIVE LAYER PROTECTION:
1st Layer of spun bond cloth filters micron- level dust.
2nd layer filters industrial pollutants, automobile exhaust, passive pollen allergens.
3rd layer of active carbon cloth filters micron- level dust.
4th layer offers filter density for smaller material.
5th filter layer of spun bond cloth filters out all kinds of harmful substances.
Because PM2.5 filters are shown to be effective in blocking the vast majority of airborne particulates, even the very smallest nanoparticles.
The PM2.5 name comes from these filters original use as protection against Particulate Matter 2.5, the smallest and most dangerous form of air pollution. Airborne virions like the Coronavirus are even smaller than PM2.5 (the Coronavirus's lipid envelope is about 120 nanometers across).
However, research has shown the material to capture nanoparticles of a similar size with a high degree of efficiency (approx. 95%), and lab tests show a PM2.5 filter with a properly-fitted cloth mask can reduce airborne particulates by as much as 90%.
*Note: this is not a medical product