Indoor Air Purification
Air pollution is defined by anything in the air that harms or discomforts humans. As you can imagine, indoor air pollution is much greater than outdoor pollution. Why? Outdoor air is still mixed more with clean, pure air than indoors even with ventilation.
Sources are germs on surfaces, dust, mold, mites, smoke, odors, allergens and many more. Filters handle only dust. Purifiers use ozone, ionic interactions, ultra violet rays, and electrostatic techniques to kill germs and cause other air problems to become colloidal and drop from the air. Filters remove gross dirt but purifiers will remove small particles.
Regardless of the quality of the filter used, a person can see small dust particles in bright sunlight floating in the air. That is not so with a quality purifier. Purifiers kill almost all living organisms and remove inorganic (non living) particles from the air. Combined, a good filter and a good air purifier remove almost all air problems.