The Honeywell Transmission Risk Air Monitor is an easy-to-deploy, portable device that measures carbon dioxide and features a proprietary risk alerting system based on different activity levels within a room. This allows end users to proactively improve indoor ventilation which can help reduce the spread of certain diseases and decrease the risk of exposure among building occupants.

Real-time monitoring of indoor ambient air can be an indicator of increased risk of airborne viral transmission, utilizing different levels of risk-based factors such as CO₂ concentration levels and the type of human activity in the area. Using this guidance and proprietary algorithms, Honeywell identified air quality conditions that are driven by common activities and variables such as average room size, number of people present, breathing rate, and duration.

The device comes with three pre-programmed indoor activity settings: low activity (movie theaters, libraries, and classrooms), medium activity (restaurants, offices, small clinics), and high activity (gyms, indoor arenas, recreation centers) and is recommended for coverage of 800-1000 square feet. For each setting, the monitor provides indications using a traffic light pattern (green, yellow, or red) and a sound alarm so users can be aware of conditions that may increase the risk of airborne transmission based on detectable CO₂ levels.