Yes, Omron's purifier has negative ion function, which is mainly used for refreshing air, calming, hypnotizing, relieving pain, relieving cough, relieving itching, diuresis, stimulating appetite and lowering blood pressure. After the thunderstorm, people in the forest feel very comfortable by the waterfall. This is because the negative ions in the air increase, and some functions are similar to oxygen. It belongs to Omron. After a while, you can feel that the air tastes obviously different.