Bringing fresh, outdoor air into your home helps keep virus particles from accumulating inside. If it's safe to do so, open doors and windows as much as you can to bring in fresh, outdoor air. While it's better to open them wide, even having a window cracked open slightly can help.

How long can COVID-19 linger in the air?

The smallest very fine droplets, and aerosol particles formed when these fine droplets rapidly dry, are small enough that they can remain suspended in the air for minutes to hours.

How does ventilation help prevent the spread of COVID-19?

Improving ventilation is an important COVID-19 prevention strategy that can reduce the number of virus particles in the air. Along with other preventive strategies, including wearing a well-fitting, multi-layered mask, bringing fresh outdoor air into a building helps keep virus particles from concentrating inside.