Ignoring the link to the site, can you post the link to whick mask you're looking at wearing?
I'm a H&S professional, and can assure you most "pollution masks" are nonsense and you'd be better off wearing a hanky round your face. Why?
Because masks affect your breathing, and anything that does that has to be controlled.
Firstly, for any mask to be effective, it has to have a good seal on the face, much like when you go scuba diving. Otherwise everything just gets in the gaps and it's all rather pointless. This needs to be carried out by someone trained to do so. HSE recommends using someone from the Fit2Fit programme for work masks. I don't know what exists for outside the work arena.
Secondly, the filter needs to be the correct one for what you are trying to protect against, and they do different jobs - dusts, chemicals, fume, asbestos, vapour, fibres, smoke etc. Some can protect against multiple things, but cannot protect against them all because they are too different.
Thirdly, if you wear a filtering mask for more than 30mins at a time, you should really be wearing an air fed piece, due to the discomfort and difficulty you'll find in breathing through a properly fitted mask. An air fed mask is a full face mask, still needs to be fitted to you by someone competent to do so. This is supported by a battery powered device usually worn on the belt.
The best known version of this is breathing apparatus, with tanks of air carried on the back, which you see the Fire Brigade wearing in some situations.
So I'm afraid IME antipollution masks are so far scaremongering and until I've seen more evidence of their efficacy, I can't see how they can be of use, but can see how they'll make you pass out pretty quickly.