I’ve got a small carbon filter mask but I always forget to wear it. I got it from the Gochen shop in Taichung.
For the Taipei area, check out the places mentioned in this post by Kawasaki Rider and Awol’s post below it;
[forumosa.com/taiwan/viewtopic.ph … 184#408184](Looking for a bike mask, or parts
[Edit: I’ll quote those posts here. Useful information to add to Vroom, vroom.][quote=“KawasakiRider”]I know of 2 places that sell them. One is at Wang Shin on the corner of Hoping and Ninpo Road in Taipei. They sell all kind of motorcycling gear. The other place is in Chung/Yonghe it is down the street from the Ching-An MRT station on the orange line. The store is called Maximum. PM me if you need more detail directions.[/quote][quote=“AWOL”]Boutique De Velo listed on the formosanfattire site has them[/quote]