Choosing the best air purifier is a very difficult decision for the need of each situation allergy or asthma has different needs. Adding to this difficult task, that different types of allergens and pollutants are removed from the original in various ways. Here are some comparisons of some of the most popular type of air purifiers.

Air purifiers with HEPA (High Energy Particle Arrest) filters were originally developed for the Atomic Energy Commission and are used in commercial clean rooms to eliminate dust particles and other pollutants. This is a piece of paper or polymer with tiny holes that allow air to pass though the material but not much else. The holes are so small that you need lots of surface for a reasonable amount of airflow to pass though the material. It is for this reason that the medium is always folded in an accordion or zigzag to get a lot of surface in a small area. There is also a remixed version of the technology that a manufacturer uses where the holes in the HEPA filter are slightly larger to promote more air but the air is charged with electrostatic wands. Which then attracts one of the smallest particles that pass through the holes. HEPA filters work well in the house to trap particles. The disadvantage is that the filters must be changed regularly (every 6 months to 5 years depending on manufacturer). Before purchasing would also check the amount of air through the fan noise filter passes, how long the filter is good for the price and finally two original unit and replacement filters. The consideration of any unit depends HEPA efficiency (the amount of air through the filter passes), fan noise, filter life and price.

UV air purifiers use ultraviolet light. Ultraviolet light in the right intensity destroys the DNA of microorganisms like bacteria and viruses. The disadvantage of a UV air purifier that eliminates gaseous pollutants very little and no particles in the air. It would therefore be necessary to buy an air purifier with UV or another type which is combined with another filtration system.

Ion generator air purifiers are small devices which air purifier has a flow of negatively charged ions. These charged ions of particulate pollution and when the particle bumps against something it sticks due to the electronic charge. These devices are used on U.S. submarines and in the poultry industry to keep the dust down.

These air purifiers do what they say, but there are some very distinct disadvantages. The particles get on your walls so your walls turn black near the device. Second, since they generally do not have a fan they only work in a localized area. They also do nothing for gas pollution and others may put off some dangerous ozone.

You can see just with the 3 examples above there are differences in air purifiers. Search and comparison shopping is necessary to find a cleaner that fits your particular case. Do not let hype affect your promotion decision, choosing the wrong air purifier is as bad as not having one at all.