Magen David Adom ambulances in Israel are being fitted with IN-EX filtration units donated by AVVIR, a division Israel’s A.L. Group. IN-EX initiates a chemical reaction with ultrasonic energy. It was developed at Bar-Ilan University by the inventors of Sonovia facemasks.
https://www.israel21c.org/filter-turns-ambulances-a-c-unit-into-an-air-purifier/