Air Quality Monitors can real-time detect & alarm CO2 in air, and built-in with VOC, Temperature & Humidity sensors. They even can be customized with outputs to control air ventilation system directly.
These devices are of high reliability and practicability, and able to work in any Z-Wave network with other Z-Wave certified devices.
Device is suggested to be installed indoor, a place with around 1.5m height above the floor where represents the average CO2 concentration. It should be away from direct sunlight, any cover, or any heat source, to avoid false signal for temperature control.