Concentration of Negative Ions in Different Environments Environment Concentration * Waterfalls 95,000 – 450,000 breezy forest 50,000 – 100,000 Breezy country meadow 5,000 – 50,000 Cities 100 – 2000 Rooms and offices 40 – 100 Rooms with Air Conditioner0 – 20 *Approximate Concentration of Negative Ions per cubic centimeter (cc3)
Ionic air purifiers that use this technology emit negative ions that seek out and "ground" positively charged particles such as dust, smoke, and fumes. The particles, once charged, then stick to furniture and the floor. They must be removed by vacuuming or else they are re-introduced into the air through movement.