Every parameter, explained.
Our monitors track up to 12 environmental parameters and combine them into 5 calculated indicators — single scores for air quality, ventilation, comfort, virus resistance and mould risk. Here is what each parameter is, why it matters, and the levels to aim for.
Comfort & ventilation
3 parametersTemperature °C
Thermal comfort, and the baseline every other reading is judged against.
Relative humidity %RH
Too dry irritates airways; too damp grows mould. The preservation band.
Carbon dioxide ppm
The single most reliable signal of how fresh — or how stale — indoor air is.
Gases & VOCs
5 parametersTVOC µg/m³
Total volatile organic compounds — the chemical load from materials, cleaning and people.
Formaldehyde µg/m³
A carcinogenic VOC off-gassed by furnishings, adhesives and building materials.
Ozone µg/m³
A reactive gas that irritates airways; enters from outdoor air and some equipment.
Nitrogen dioxide µg/m³
Combustion gas from traffic and gas appliances; a marker of outdoor air ingress.
Carbon monoxide ppm
The silent, toxic combustion gas — a direct safety parameter.
Particulate matter
4 parametersPM 1.0 µg/m³
The finest particles, penetrating deepest into the lungs and bloodstream.
PM 2.5 µg/m³
Fine particles that reach deep into the lungs — the headline air-quality metric.
PM 4.0 µg/m³
Mid-range respirable dust, between fine and coarse fractions.
PM 10 µg/m³
Coarse inhalable dust, pollen and particles from activity and outdoor air.
Five indicators, calculated for you.
Individual parameters tell you what is happening; indicators tell you what it means. Each one combines several readings into a single, easy-to-read score — so anyone can see the state of a space at a glance.
Air quality
A single overall score for how clean the air is, combining the key pollutants into one status anyone can read at a glance.
Ventilation efficiency
How well fresh air is replacing stale air. Rising CO₂ and TVOC mean ventilation is falling behind occupancy — the signal to bring in more fresh air.
Thermal comfort
Whether the space sits in the thermo-hygrometric comfort zone, combining temperature and humidity into one easy comfort read.
Virus resistance
The air’s resistance to airborne virus spread, estimated from the conditions that influence how long viruses stay active and how well a room is ventilated.
Mould resistance
The risk of mould growth on surfaces, built from the history of temperature and humidity over time — because mould comes from sustained damp conditions, not a single moment.
Air-quality and virus indicators follow the RESET Air and RESET Viral indices; ventilation and comfort indicators are computed in real time from the parameters above.
Not sure which parameters you need?
Each device tier covers a different set. Compare the four tiers to see exactly what each one measures.