Negative ion air cleaner or purifier has been around for a long time. But in face of the COVID-19 pandemic, this little device has very pronounced benefits. Use of them around your house may help reduce transmission to family members.
There are a very many research papers available on how negative ion helps in reducing the spread of airborne viruses.

Here are some links:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4477231/
https://www.thequint.com/tech-and-auto/gadgets/what-are-ionisers-can-they-fight-covid-19
https://www.newscientist.com/article/dn3228-air-ionisers-wipe-out-hospital-infections/

To learn how the negative ion air purifier works, visit the wikipedia link: