Our selection of leading air quality monitors house advanced sensors to measure the level of particulate matter, carbon dioxide and VOC's (volatile organic compounds), radon and more in the air. The Pure365 app allows one to view on their phone real time data as well as past pollution events. The connected air quality monitor takes the important first leg by communicating with your smart thermostat to activate the HVAC system when pollution levels pass a certain threshold that you can set manually.