Carbon dioxide has many beneficial effects on the body. As with anything, there needs to be a proper balance. It has been found that increasing the carbon dioxide levels not only improves clear thought but also aids those who suffer from asthma. The electrical quality of the air you breathe also has an effect on serotonin levels and thus creative alertness. The number of positive or negative ions present measures electric air quality.
Negative ions are displaced electrons, which attach themselves to nearby molecules.
These molecules become negatively charged. It is the negative ion of oxygen that affects us most. If you have ever stood by a waterfall or in a deep forest full of evergreens and felt exhilarated, you have felt the effects of negatively ionized air. The normal ion count in fresh country air is 2,000 - 4,000 negative ions per cubic centimeter. At Yosemite Falls, you'll experience over 100,000 negative ions per cubic centimeter.