The document discusses indoor air purification and ionair air purification systems. It describes problems with indoor air quality in crowded indoor environments like large amounts of odors and airborne bacteria. It then explains that ionair uses bi-polar oxidation to produce activated oxygen ions that attach to and eliminate VOCs and particles, improving indoor air quality. The ionair system includes sensors and a controller that monitors air quality and ozone levels and adjusts the ion production accordingly to continuously purify the air.