
Knowing The Difference Between HALO’s Health Index And Air Quality Index
Health Index
Through our health sensors, HALO’s Health Index provides a real-time indication of the potential risk for the spread of airborne infectious disease in a building.
Health Sensors Are Used to Reduce the Spread of Infection.
HALO offers Short Measurement Cycles for Fast Remediation.
Number of Contaminants Sampled in HALO: 6-7.
Health Sensors/Health Index Factors:
Carbon Dioxide (CO₂) • Particulate Matter (1 μm, 2.5 μm, 10 μm) • Humidity (RH) • Volatile Organic Compounds (VOC) • Nitrogen Dioxide (NO₂)

Carbon Dioxide (CO2)
While the effects of high levels of CO2 were long thought to be benign, research has found that concentrations as low as 1,000 ppm can affect people’s cognitive function and decision-making performance.
The greatest source of indoor CO2 is people themselves, as it’s a byproduct of our respiratory function. Coupled with poor ventilation, this commonly leads to high levels of CO2 in many workplaces.

Nitrogen Dioxide (NO2)
Nitrogen dioxide (NO₂) is an ambient trace-gas result of both natural and anthropogenic processes. Long-term exposure to NO₂ may cause a wide spectrum of severe health problems such as hypertension, diabetes, heart and cardiovascular diseases, and even death. Utilizing health sensors for continuous monitoring of NO₂ levels is vital in the healthcare industry and in the manufacturing sphere and is recommended in large urban areas where greater amounts of automobile traffic generate NO₂ that seeps into buildings.


Temperature and Humidity
High levels can affect more than your comfort. High temperatures and excessive humidity promote mold and mildew growth. These can cause structural damage to your workplace and cause allergy-like symptoms in those with sensitivities. Monitoring these levels with a temperature sensor can help you prevent facility and health problems and tip you off to potential future consequences like structural weaknesses and leaks.

VOC (Volatile Organic Compounds)
The acronym stands for volatile organic compounds, gases emitted from a variety of materials that can have short- and long-term health effects. Concentrations of many VOCs can be up to 10 times higher indoors than outdoors.
Sources of VOCs include many common products, including cleaning fluids, disinfectants, paints, and varnishes. Burning fuels like wood and natural gas also produces VOCs.
Short-term exposure to low levels of VOCs can cause throat irritation, nausea, fatigue, and other minor complaints. Long-term exposure to high concentrations of VOCs has been linked to more severe respiratory irritation as well as liver and kidney damage. Products can emit VOCs even when they’re in storage, though to a lesser extent than when they’re actively being used. Sensor technology is increasingly employed to monitor these emissions continuously, ensuring safety in both homes and workplaces.
