A mask + PM2.5 filter provide protection without the unnecessary strain on your
heart. PM2.5 filters are made from the same advanced materials used for respirators like the
N95 and KN95, use as protection against Particulate Matter 2.5, the smallest and most
dangerous form of air pollution. Also 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%. Disposable PM2.5 filters are flat, so they
take up less space than standard respirators. They never lose effectiveness, and you can use
them continuously for 16-24 hours, around 1 – 2 weeks of occasional use (or whenever it
becomes harder to draw a breath).