Coronavirus: Quebec recommends against using portable air purifiers in schools Pedro couldn’t believe his ears when Quebec Public Health recommended against installing air purifiers in classrooms.The agency said the purifiers could have the adverse effect of spreading the virus around.“Generally speaking, if you have a product, an air purifier that is properly conceived and properly built, that notion is absolutely ludicrous,” Pedro said.He added that HEPA air purifiers are required by law in dentists’ offices and operating rooms.[ Sign up for our Health IQ newsletter for the latest coronavirus updates ]“If it’s good enough for an operating room, I would like to know what kind of moron doesn’t think that type of technology is good enough.