Since their doors have reopened, schools have been faced with surging coronavirus cases—even among their students—and with that comes a keen focus from many schools to provide better air quality, hopefully scrubbing viral particles in the process. There is a concern, however, that the rush in purchases is leading to the adoption of unproven air cleaners that could harm those around them through secondary pollution. In particular, experts are centering their concerns around needlepoint bipolar ionizers.