Approved by the U.S. FDA (Food & Drug Admin.) as an approved allergy treatment.
Ionization is mandatory in many European and Russian Hospitals.
In March of 1999, Good Housekeeping Magazine had its engineers test an ionizer by using a smoke test, and found that it cleared out the smoke in a tank.
A recent study by the U.S. Dept. of Agriculture found that ionizing a room led to 52% less dust in the air, and 95% less bacteria in the air (since many of the pollutants found in the air reside on floating dust particles).