They use ionizers in hospitals to combat airborne infectious diseases.
The electrically charged air molecules attract dust, water droplets and other small particles and then fall to the floor, so it works throughout the entire cabin, not just at the filter location. Way more effective than simple filtration, as filter is no more effective than a mask to trap a virus.
https://mobile.twitter.com/Sokrates_17/status/1323345668786802700
Biden’s laptop matters!