Consider using a portable air cleaner.
If you don’t have an HVAC system or just want extra filtration, consider using a portable high-efficiency particulate air (HEPA) cleaner. They are the most efficient filters on the market for trapping particles that people exhale when breathing, talking, singing, coughing, and sneezing.
When choosing a HEPA cleaner, select one that is the right size for the room(s). One way to do this is to select a HEPA fan system with a Clean Air Delivery Rate (CADR) that meets or exceeds the square footage of the room in which it will be used. The larger the CADR, the faster it will clean the air. See EPA’s Guide to Air Cleaners in the Home pdf icon[3 MB, 7 pages]external icon for more information.