@oreoteeth Then would you say that it's odd they're still wearing masks in November, then? Would this have been after smog season?
Are they wearing the masks to make a point about how increasing bicycle use would reduce smog, rather than for practical reasons because it was actually smoggy that day?
This post has a pic of a 1977 protest, could be the same one? Nobody is wearing a mask because they are singing, although one man to the right has a mask under his chin: https://bicyclecoalition.org/launching-in-the-70s-the-bicycle-coalitions-first-decade/
@skyfaller Well, we do get those freakishly warm fall days sometimes. It's def possible that there are smog days in the spring or fall. I mostly went to the Velodrome on summer nights. Couldn't say if LV cyclists were still masking in the fall.
And of course it's also possible that local industry smokestacks were pumping out more pollution than normal on that particular day.