Cleaner Ozone Ionizer

I want to breathe clean air inside. anyone know about air purifiers, circulation, fans of house, etc.?

I have allergies to dust and mold and bought an air purifier. I do not know if I have to close my windows and doors when I use it. I'm not sure if I should ever let the fan to circulate the room air (or frequency of use). Does anyone know how to circulate the air and use an air purifier? (Another question is how long to run the ionizer on purifier or if I leave it on the will of ozone be bad for me).

u wider Google search for answers

Ozoniser/air purifier, Ozonizer/air cleaner, ionizer