We spend 90% of our time indoors and 30% in our bedrooms. Ventilation is essential as the carbon dioxide levels of 2 people in a room with a closed door can easily go over the recognised safety limit. In winter we tend to keep all windows closed to conserve energy but ventilating regularly is essential. Another option is to have house plants that purify the air, an asparagus fern is one of the most efficient and even meant to absorb bacteria!
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