This is one of many alternatives to lockdowns and vaccines that reduces virus transmission:
See this draft design.

How much will this reduce virus transmission?
Can we keep shops and restaurants open that use such a device even during a lockdown?
Would this make sense in elderly homes, too?
E.g. in the dining hall?
In schools?

Feel free to let yourself be inspired by this draft to design, to manufacture and to sell a device if you have a business that is capable to do so.
The draft drawing is under Creative Commons Attribution-ShareAlike 4.0 International License.