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.

The main problem I've had with these masks in the past is not that they don't filter stuff effectively (who really knows if they do or don't), but the fact that you sweat prolifically underneath them. I've even got a mate who managed to get a nasty skin infection after using one for a while. What's really needed in a mask is one that allows your skin to breath - neoprene is not an ideal material.

That said - why can't we do what the Frogs do in Paris, and just start banning certain vehicles from London when pollution levels reach high levels?