Originally Posted by
ThermionicScott
Nothing about masks in that page.
Check my other links.
For instance,
http://www.myhealthbeijing.com/child...n-mask-for-me/
At over 97% effectiveness, on a crazy bad day of PM2.5 concentration of 500 ug/m3, the air inside my mask is around 13 ug/m3 — just within reach of my ideal target of 10
Last edited by erig007; 04-22-15 at 08:57 AM.