The HALO Smart Sensor provides a real-time Health Index of the potential risk for the spread of airborne infectious disease in a building. Air Quality Index (AQI) is a measurement of quality of are based on an EPA scale.

This Health Index is used to reduce the spread of infection and it utilizes short measurement cycles for fast remediation. The Health Index factors are:
• Carbon Dioxide (CO₂)

• Particulate Matter (1 μm, 2.5 μm, 10 μm)

• Humidity (RH)

• Volatile Organic Compounds (VOC)

• Nitrogen Dioxide (NO₂)