Reasonable idea and suggestion: Rebreathing viral particles that are breathed out may lead to infection of other parts of the lung. Do you have symptoms? Outdoors or with open window: Breathe out, turn to breath in clean air. Repeat multiple times, and periodically.
Refinement: Deep breathe out to exhale as much of the viral particles as possible (not if too uncomfortable). Then breathe in.
Please share. Everything we can do to help is important.
In high density areas a HEPA air purifier can help. Also when asleep.
