Simple Respiratory Protection—Evaluation of the Filtration Performance of Cloth Masks and Common Fabric Materials Against 20–1000 nm Size Particles | Oxford Academic

Fig. 2.

Polydisperse NaCl aerosol penetration levels for sweatshirts and T-shirts at two different face velocities. Error bars indicate 95% confidence level.

Polydisperse NaCl aerosol penetration levels for sweatshirts and T-shirts at two different face velocities. Error bars indicate 95% confidence level.

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