The answer to this question is yes. Some of the air purifiers can emit EMF radiation, which is terrible for your health. Some of the air purifiers can produce a high frequency of radiation that can be dangerous.
But there are many options on the market and many manufacturers that produce air purifiers that emit low EMF, which is not harmful to your health. All of the above-mentioned air purifiers emit only a tiny amount of radiation that is completely safe and not harmful.