Ventilate your room frequently
Properties of the new coronavirus
It does not seem to be airborne, but it is known that fine grains called micro droplets drift in the air for several tens of minutes in conversation, etc., and it is pointed out that there is a possibility of infection by micro droplets.
Why ventilation is effective
While not airborne, the possibility of micro-splash infection has been pointed out, and indeed past clusters have occurred indoors with poor ventilation. Dusty indoor conditions can also put a strain on the throat and bronchial tubes, increasing the risk of infection. Therefore, it's a "far better to do it than not to do it" situation.
Five minutes of ventilation per hour.
Dr. Moriya, a quarantine officer with extensive corona experience, suggests ventilation "once every 1-2 hours for 5-10 minutes each time.
Open at least two windows instead of just opening a window to allow air to flow
Can be used with a ventilation fan.
Ventilate frequently rather than occasionally for a long time.
It is important to "do it as much as you can without strain".
How to check the ventilation status of a building that doesn't have open windows?（proofreading必要）
The Ministry of Health, Labor, and Welfare (MHLW) says that even in buildings where windows are not open, the recommended ventilation for the virus is provided if the Building Sanitation Law standards are met.
If you are a tenant in such a building, one of the things you can do now may be to check with the building owner or the building management company to make sure that the standards are met.
Ministry of Health, Labour and Welfare (MHLW), ventilation to improve "enclosed spaces with poor ventilation" in commercial facilities, etc.https://www.mhlw.go.jp/content/10900000/000616069.pdf Ministry of Health, Labour and Welfare - To the owners of management rights for commercial facilities, etc.How to ventilate to improve "poorly ventilated enclosed spaces.https://www.mhlw.go.jp/content/10900000/000618969.pdf