Dyson unveiled its latest generation of purification machines with new solid-state formaldehyde sensing technology, designed to capture ultrafine dust and allergens, even destroying potentially dangerous VOCs including formaldehyde. Being 500 times smaller than particles the size of 0.1 microns, it is particularly difficult to capture and if left undetected can lead to prolonged exposure due to continuous release of airborne chemicals, known as off-gassing.