The ideal ratio of negative ions is 5 for every 4 positive ions. This will produce a sense of well being and a healthier body. Positive ions affect the chemistry in our bodies and stress us out which affect our hormones and glands. When under emotional stress, our bodies produce more seratonin than we need. This acts as a tranquilizer to help us cope, but we end up feeling lethargic and suffer from sleepless nights, depression, anxiety and irritability.
Some people even feel suicidal.
Traffic accidents increase during this overbalance of positive ions. They can't pinpoint the problem, they just know they don't feel good. Sick building syndrome is more common today than it was 20 years ago. Most homes and offices are built air tight and when the heating or air conditioner is running, this causes friction which depletes the negative ions. Bacteria thrives in positive ion air.