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Comprehensive Guide to PM2.5 Filters for Face Masks & Face Covers

Comprehensive Guide to PM2.5 Filters for Face Masks & Face Covers

A PM2.5 filter is a mask insert that can be inserted into the inner pocket of a cloth mask to increase it’s filtering performance. It gets its name from an established standard based on  2.5 micrometers (microns) – equivalent to 0.0025 mm – a reference to the size of airborne particulate matter that this filter is targeted for.

It is made up of five filtration layers, including a middle layer of activated carbon, that work together to achieve superior filtration performance. Note that no mask is 100% protective against COVID-19 virus; the use of masks is still encouraged...