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Philly schools are spending $4.5 million on air purifiers to curb COVID-19. They won’t help much, experts say.

The devices have already been purchased and will be installed in every classroom by the end of July. Some experts question their effectiveness and safety.

Philly Schools Superintendent William R. Hite Jr. talks about the use of air purifiers, behind him and to the right, that will be implemented when classrooms reopen in the fall.
Philly Schools Superintendent William R. Hite Jr. talks about the use of air purifiers, behind him and to the right, that will be implemented when classrooms reopen in the fall.Read moreJOSE F. MORENO / Staff Photographer