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I thought the same (re:size of particles).
These look halfway decent: https://cambridgemask.com - apparently filter 99% of PM2.5 and P.M0.3
dan
@Thrustvector
Interesting that the 3M disposable masks used in that study are supposedly capable of filtering 95% of 0.3 micrometer-sized particles; I was under the impression that most of the cycling masks sold were useless against PM10s and smaller?
Have only skimmed the study, but it looks like they only evaluated effectiveness for walking, rather than for any strenuous exercise.