- COVID-19 infections mainly occur indoors, with only 1 out of 318 outbreaks happening outdoors.
- Poor ventilation significantly increases transmission risk, as seen in a restaurant outbreak where 11 people were infected in one corner.
- Talking releases 30 times more virus than breathing, emphasizing the need for proper ventilation.
- Ventilate indoor spaces as much as possible, even opening windows during breaks, and ensure mechanical systems bring in fresh air.
- Avoid indoor singing and prioritize outdoor activities like sports to reduce infection risk.
- CO2 meters can help monitor air quality, with rising CO2 indicating insufficient fresh air.