Prevention
Indoor ventilation at home and work: reducing respiratory risk
Better ventilation reduces the build-up of shared indoor air. Practical steps for homes, workplaces, shops and classrooms.
Prevention
Preventing COVID-19: use layers that match the risk
No single measure removes all risk. Ventilation, well-fitted masks, vaccination and staying away from others when ill reinforce each other.
Prevention
Masks and ventilation: practical layers for reducing respiratory virus risk
Masks and cleaner indoor air are complementary layers that can reduce respiratory-virus risk, especially in crowded or poorly ventilated settings.
Prevention
How to choose and use a mask: when it still helps
Masks are one layer of risk reduction. Their benefit depends on the setting, fit and the needs of people nearby.