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Air purifiers: indoor pollution kills but many devices are ineffective and some may even causeharm
Air purifiers: indoor pollution kills but many devices are ineffective and some may even causeharm,Some air-cleaning devices release pollutants such as ozone and nitrogen oxides.

Air purifiers: indoor pollution kills but many devices are ineffective and some may even causeharm

Some air-cleaning devices release pollutants such as ozone and nitrogen oxides.