A multipurpose air-purifier is generally meant to eliminate everything in the air: dust, spores, pet dander, dust mites, smoke, odors, harmful gases, chemicals and humidity. Usually, such a multipurpose system combines two or more air-cleaning systems such as: a true HEPA system, an activated charcoal system, and a UV filter system. The HEPA air-filter removes allergens like pet dander, pollen, dust, mold, and dust mites. The UV lamp removes 98% of airborne bacteria and viruses and finally, the activated carbon filters eliminate all odors. Some popular models that combine two or all three systems are: The Alen Tower Air Purifier T300, which incorporates an ionizer. This model has proved 1000% better than other ionic air purifiers, and guarantees no harmful ozone dispersion into room air (Price: $300). Another popular multipurpose Air-Purifier is the Airpura R600 Air Purifier.