PM 2.5 Mask Filter medium to protect you from a range of airborne contaminants. (For specifics please peruse website’s below).
Filters contain 5 layers of activated carbon and non-woven melt-blown filter cloth.
For more information on PM 2.5 filters see here:
https://www.health.ny.gov/environmental/indoors/air/pmq_a.htm
or here:
https://cambridgemask.com/blog/6-things-you-need-to-know-about-pm2-5/