What are healthy negative ions?

Negative ions in the air can boost your alertness and mood, according to WebMD. Negative ions occur naturally in high altitudes and near large sources of water, like waterfalls or the open ocean. These odorless molecules help your body produce serotonin, a “feel good” chemical in your brain. Negative ions are tasteless and odorless molecules found in the air. They are known to increase oxygen flow to the brain and, as a result, facilitate alertness, decrease drowsiness and stimulate mental energy. Negative ions are also known to protect against germs and decrease throat irritation as well as sneezing and coughing. Unhealthy positive ions are released into the atmosphere by air conditioners, televisions, computers and other electronic devices. These ions are responsible for a variety of symptoms including headaches, fatigue, nausea, and dizziness. These symptoms originate from the fact that electronic devices deplete the air of negative ions.