London Air Quality - Pollution

I don't wear one, but from the blurb from Respro, "the Techno™ filter has sub-micron filtration capability. What this means is that it is able to trap particles less than one micron in size which is more than capable of the removal of 2.5 micron particulate material (PM)."

From http://aqicn.org/city/united-kingdom/london-bloomsbury/ it appears that 2.5 is the main issue right now.

Well it's gonna get ridof some of PM2.5, not all of it.

It's gonna get rid of the Saharan Dust which is relatively coarse, i'd have thought mostly in the PM10 size category. If the filter is 1 micron then it will stop anything bigger than PM1 but still let through all gasses (NOx, CO, O3 etc) and all super fine material.

If you count the particles in an air sample there are exponentially more as their size goes down. i.e more between PM0 and PM1 than PM1 and PM2.5. What I'm saying is that the masks stop coarse material but let a lot of stuff through. You don't even want to think about the nano-particles you breathe in. The mask doesn't stand a chance.