As stated by the Environmental Protection Agency, analyses completed in the US and Europe have identified that many families spend more than 90% of their hours inside and that the amount of pollutants inside is more substantial than it is outside. Indoor air pollution, such as smoke, pet dander, dust mites, mold spores and pollen can easily trigger allergic reactions, relief from which an allergy elimination air purifier can provide. Air purifiers remove air pollutants, and are on the market as whole-house solutions or individual room models. Some are likewise chosen for controlling odors. The three most popular varieties of air purifiers used are uv light, Hepa filters and ionic or electrostatic technology.

UV devices are used more often inside commercial spaces, in particular hospitals and laboratories. Powerful Uv light gets rid of germs and bacteria, including airborne viruses, making these systems remarkably effective towards illness. Only those contaminants that occur in close contact with the Ultraviolet bulb are wiped out, but others that come near it are modified to render them unable to reproduce. They usually are only successful in locations in close proximity to the light and are energy consuming and pricey. Although exceptional at eliminating disease-causing germs and viruses, Uv models are not necessarily as valuable as an allergy relief air purifier mainly because they really don't succeed in opposition to dust or pet dander.

HEPA (high efficiency particle absorbing) technology was designed during WWII. HEPA filters are a very effective allergy relief air purifier process as they are able to trap approximately 99.7% of contaminants as tiny as 0.3 microns, the size of virtually all viruses, bacteria and allergens. One micron is equal to one millionth of a meter. A fan or blower moves the air across the filter device and helps push it through the high density HEPA filter, capturing the tiny allergens. Filters must be changed frequently for the highest level of efficiency. Many devices also include carbon filters which absorb odors from smoke, food or pets.

Ionic air purifiers use electrostatic energy to clean up and purify indoor air. Much like the HEPA system, a fan circulates and contains contaminating debris. The captured contaminants are zapped with electrostatic power and become positively charged. They are powerful as an allergy relief air purifier because the positively charged debris attach themselves to the negatively charged plates in the unit, which are then wiped down. Fresh air is then re-circulated back into the room. Despite the fact that they require frequent cleaning ionic air purifiers are capable of purify a big area and are fairly quiet.