The so-call PM2.5(or PM10) contains three elements: inorganic parts(like sand), Organic Aerosol and Bioaerosol. Luft Qi is perfectly designed to decompose Organic Aerosol(such as Formaldehyde, -SH or -NH3 Chemical bondage ) and Bioaerosol (such as bacteria, virus, mold, fungus) which we make video demonstration, certification, and experiments. Luft Qi settles most harmful substances already. As for Inorganic parts(such as sand), it drops from air to the ground by 60% rate per hour. Therefore, Luft Qi consider to leave inorganic parts to vacuum cleaner, like Dyson. Don't spend money on changing filters to those falling inorganic parts which sooner or later be cleaned by vacuum cleaner.