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@Dyson
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.