How much can negative ions reach to remove formaldehyde?

When the concentration of negative ions in indoor air reaches 20,000 per cubic centimeter, the amount of floating dust in the air will be reduced by more than 98%, and formaldehyde can be removed.

Formaldehyde is a highly toxic substance, ranking second in the priority control list of toxic chemicals in China. Formaldehyde has been recognized as a carcinogen and teratogenic substance by the World Health Organization, and it is recognized as an allergen and one of the potential strong mutagens.