Comprehensive website from doctors, nurses and scientists comparing mask making techniques and materials for DIY mask making. Another great source is medical themed GetUsPPE.org Popular Science adapted its pattern here.

Georgia Tech give instructions on how to test fabric at home for breathability and usefulness repelling water. The site also gives a wide variety of patterns and methods for making a mask.

Sewstine is a historical costumer, wife, mother and doctor who compared patterns and fabrics. She sewed some herself and brought them into her hospital. She stresses that this is a comparison on a very small scale.

Single-use plastic face masks are already washing up on beaches around the world. How to tackle the rise of pandemic plastic waste materials?