20million negative ion ,30 minutes after negative ion intake, the lung is able to inhale 20% more oxygen and exhale 14.5% more carbon dioxide,they greatly benefit people's health and everyday routine, which can facilitate body growth and disease prevention .
 
Negative ions help freshen and purify the air by causing allergens such as pollen, mold spores, dust, and animal dander floating in the air (which have either a neutral or a positive charge) to be attracted to and stick to each other, forming 'clumps' (because opposite charges attract). These clumps of particles then become heavy enough so that gravity can pull them down to the floor, where they can be vacuumed up, rather than staying in suspension where they can be breathed in and cause allergic reactions.
Because there is no fan (like in filter-type air filters or room air purifiers), the dust on floors and tables is not stirred up, and so the air in a room with a negative ionizer in use can become exceedingly free of dust and pollen.