IQAir Atem Desk Air Purifier for Home, Office, Desktop, Small Room or Personal Space up to 150 sq ft, HyperHEPA Filter Technology for Bacteria, Viruses (such as COVID), Allergens, Pets, Asthma Triggers, Pollen, Dust down to 0.003 microns.  It is available in black or white. You can buy them here.

I take mine with me everywhere. This filter is epecially helpful if you are going to be forced to take your mask off for some reason (dental cleaning, TSA wanting to see your face to get through security, needing to eat and drink in a public space, etc.)