Indoor Air Quality: A daily health and comfort issue

On average, we spend almost 90% of our time indoors, whether in our homes, offices or other enclosed spaces. Whether at home or at work, indoor air quality can often be degraded. The sources of pollution are varied, ranging from smoking, furniture emissions, dust mites and the use of cleaning products, to mold and mildew, among others.

In France, some 50,000 deaths a year are linked to indoor air pollution. Assessing IAQ is therefore essential for the well-being of occupants.

Nexelec sensors incorporate cutting-edge technology that simplifies accurate IAQ measurement and analysis. The same is true in a home or office. These data enable us to take appropriate measures to ensure a healthy and comfortable environment.

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Frequently Asked Questions

Our experts answer your questions

Our detectors are certified by the LNE (Laboratoire National de Métrologie et d’Essais), giving them a high level of safety and performance. Factory-tested, our products are compatible with regulatory devices.

In an enclosed space, heat rises and stagnates at the ceiling, where the temperature is de facto a little higher than in the rest of the room. To ensure correct measurement of ambient temperature, we recommend mounting the detector on a wall 50 cm below the ceiling.

Moisture comes from a variety of sources, including human activity, breathing and architectural design problems. Air that’s too dry dries out the respiratory tract, and humidity that’s too high promotes allergies. Ideally, the humidity level in an enclosed space should be between 40% and 60%.

Correct ventilation of communal areas helps reduce the risk of viruses spreading through the air.
Measuring CO2 levels enables you to quickly check the quality of air renewal, and encourages occupants to air the room if necessary.

CO2 can cause headaches, drowsiness, difficulty concentrating, mild nausea and rapid heart rate.
NEXELEC’s CO2 sensors provide reliable and accurate measurement of CO2 concentration.

NDIR (Non-Dispersive Infrared) sensors offer highly accurate measurement of CO2 levels. They use infrared spectroscopy to specifically detect CO2 molecules, enabling reliable and consistent measurements.

NDIR sensors are designed to maintain their calibration and accuracy over long periods, making them a durable choice for continuous monitoring of CO2 levels.

NDIR sensors are effective and reliable in an environment where CO2 levels reach at least a minimum of 400 ppm for several consecutive hours: at night and at weekends in communal areas, during the day in a bedroom.


The calibration process is performed automatically by the device every 8 days. No maintenance required. The reliability of CO2 measurements is guaranteed throughout the product’s lifetime.

You can also calibrate the CO2 sensor manually:

1. Place your product near an open window for at least 2 minutes.
2. Quickly press the product’s central button 6 times
The green LED lights up throughout the calibration process (for approx. 10 seconds).
Once the LED has gone out, manual calibration is complete.

NFC (Near Field Communication) is a magnetic field technology used to exchange data between a product and a smartphone.

To configure the product, simply :

  • Download the free Nexelec TOUCH application from Google Play Store or Apple App Store
  • Select product and follow application instructions

VOCs have very harmful effects on health. These molecules can trigger heart and nervous system disorders, irritation of the eyes and mucous membranes of the respiratory tract, nausea and more.

VOCs are detectable in :

  • Furniture (tables, cupboards, etc.), wall and ceiling coverings
  • Consumer products (cleaning and synthesis agents, solvents, degreasers, etc.)
  • Finishing products (varnish, glue, acrylic, silicone, etc.).

It is therefore important to be able to differentiate Volatile Organic Compounds from the rest of the pollutants present in the air.

NEXELEC Volatile Organic Compounds sensors continuously analyze the air and detect VOCs to help you act accordingly.

Depending on the model, products offer lighting and energy optimization, acoustic monitoring, space and safety management, and automation scenario options.

Fine particles penetrate deep into the respiratory tract. They come from human activity (dust), combustion heating (coal, wood, fuel oil, etc.) and road traffic.

Depending on their degree of toxicity and concentration, they can cause short- or long-term pathologies such as eye and respiratory tract irritation, or even cardiovascular problems and cancer.

NEXELEC sensors are capable of measuring different pollutants, depending on the model. Depending on the country and the environment, thresholds may vary.

Depending on WHO and ANSES regulations, thresholds may differ from one country to another.

The values set out below are valid for ERP (Etablissements Recevant du Public) in France.


Carbon Dioxide (CO2)

CO2 is a good indicator of Indoor Air Quality. If ppm levels are too high, ventilate as soon as possible.

Interpretation of CO2


Volatile organic compounds (VOCs)

These compounds are emitted by paints, glues and other solvents. If the concentration is too high, ventilate as soon as possible.

VOC interpretation


Fine Particles (PM)

PM are grouped into 3 categories: PM1, PM2.5 and PM10

Fine particles are often found in dust and smoke. Prolonged exposure presents a health risk. When the threshold is too high, open the windows to renew the indoor air.

Interpretation of PM


Formaldehyde (HCHO)

Formaldehyde can be found in new furniture, cleaning products and so on. If your detector emits a Red LED, take action as soon as possible.

Interpretation of HCHO


Carbon monoxide (CO)

If carbon monoxide levels reach excessive levels in a room, it presents a potentially fatal hazard. It’s crucial to detect the origins of CO in the environment, and to have all combustion appliances inspected, such as stoves, boilers, stoves and so on. If the threshold is too high, ventilate the room as much as possible.

Interpretation of CO

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