Found! PM2.5 Replacement Filter Activated Carbon Adhesive Tape Backing Adult Child | eBay
Finally found some mask filters with adhesive backing! I’m still trying to find some locally accessible to me, but those of you in the States can get these already. Each filter has a 4-point adhesive to attach to your mask (mask is not included). Source: PM2.5 Replacement Filter Activated Carbon Adhesive Tape Backing Adult Child…