Radon is an invisible and odorless gas, which is formed continuously in the earth's crust. Outdoors, the radon concentration will normally be low, and health hazards only arise when the gas seeps in and is concentrated in our indoor environment.

According to the World Health Organization (WHO), radon is the main cause of the development of lung cancer after active smoking. It is estimated that radon in homes causes around 300 lung cancer deaths annually in Norway. Radon occurs in all kinds of buildings and the total radon risk is due to the total exposure in different buildings; at work, in your free time and at home in a private home.
Source: Norwegian Directorate for Radiation Protection and Nuclear Safety (www.dsa.no)

Government regulations in Norway set binding requirements for maximum limits for Radon in the air. If the radon level exceeds 100 Bq / m3, it is recommended that measures are taken to reduce the levels, while this is required if the level exceeds 200 Bq / m3.

The only way to know anything about these levels is by measuring. Through continuous radon measurement, the levels are constantly monitored, delivering confirmed values ​​to users of buildings, and/or verifying the effect of any radon-reducing measures.

Carbon dioxide (CO₂) is formed by the metabolism in the body and is found in the air we exhale. Several studies show correlation between high concentrations of CO2 in indoor air and health problems such as headaches and mucous membrane irritation, reduced work capacity and dissatisfaction.

CO2 measurements can provide a picture of the air exchange in a room where humans are believed to be the dominant source of pollution (due to the content of CO2 in the exhaled air). The air quality in, for example, classrooms can be controlled by measuring CO2.

The Norwegian Institute of Public Health has set the standard requirement for the CO2 content in the air at 1800 mg / m3 (1000 ppm). If the CO2 content exceeds this value, it is a sign that the ventilation is too poor in relation to the number of people staying in the room.

Source: National Institute of Public Health (www.fhi.no)

The CO2 content of air is easy to measure. It spreads evenly in a room and is not affected by humidity or temperature. In public buildings, ventilation is often controlled directly on the basis of CO2 measurements, as these also give an indication of the totality of air quality. CO2 is measured in the number of CO2 molecules per million molecules (ppm).

It  is proven that the right temperature in living, teaching and office premises counteracts concentration failure, sick leave and errors. As a well-being factor, temperature is also absolutely crucial.

There are no fixed temperature limits in regulations or the Working Environment Act. The Norwegian Labor Inspection Authority recommends, however, that one strives for temperatures in the range 19-22 degrees Celsius in work environments with physically light indoor work.

Temperature measurement is performed in points, and there can be some large differences in a room. The best measurement results are therefore obtained with several sensors in the same room.

Humidity within a normal range of 20-60% relative humidity (RH) has little effect on the experience of the indoor climate. High humidity will to some extent increase dust binding and reduce problems with static electricity, but there are no formal requirements for relative humidity. 

High humidity inside in winter, often combined with low temperature and humidity outside, can increase problems with condensation and moisture inside. This should therefore be avoided in accordance with health an labor inspection authoritie's guidelines.

Indoor air pressure is of secondary importance for well-being and the experienced indoor climate for people. Air pressure is measured in hPa (hectoPascal), where the reference value is the air pressure at sea level (1013 hPa).

In a building, however, measuring air pressure has several important functions in relation to control of ventilation and other measuring parameters for air quality. Differential values between rooms are e.g. important where Radon measures have been implemented. Such rooms must have an overpressure in relation to their surroundings. This is normally taken care of in the ventilation system, but the values there do not necessarily reflect the real value in a room.

Another important function is as a reference for other indoor climate sensors in the system. Sensors for CO2 measurement are sensitive to air pressure and need a reference value to give accurate readings.

Volatile organic compounds (VOCs) are the collective term for chemical substances released by building materials, furniture and other furnishings, cleaning products, food, people, paints, microorganisms, etc. VOC most often occurs in concentrations so low that it only potentially affects people with allergies or hypersensitivity.

Norway previously had an upper limit (TVOC) of a maximum of 400 µg / m3 air. Lack of documentation that the limit had any health anchoring or documented threshold value led to no longer setting such a limit. 

In most homes and work environments, there are many different sources of air pollution. Even humans and animals are sources of fiber, particles and microbiological material. Other sources of air pollution in the indoor environment can be heating, cooking, tobacco smoke, wear and tear on surfaces, cleaning, various biological sources, etc. 

Particular air pollution refers to a mixture of solid or "liquid" particles in the air, where the particles typically vary in size, composition and origin. Health risks are often associated with particulate matter particles 10 microns in diameter or less. These particles are small enough to enter the lower respiratory tract (inhalable).

Source: Norwegian Health Information (www.nhi.no)

Particulate matter normally measured through so-called PM10, which sums up the weight of particles smaller than 10 micrometers in diameter. It does not differ in the size of the particles. Studies indicate that it is the smallest particles that pose the greatest potential health risk. These have the designation PM2.5 and are considerably more complicated to measure.

Measurement and monitoring of particulate matter through PM10 gives a good indication of the amount of both small and large particles, and whether cleaning and filtration of outdoor air is adequately taken care of.

Carbon monoxide (CO) is a colorless and highly toxic gas that claims many lives worldwide each year. CO warning is important in rooms where you have oil burners, gas stoves, grills, fireplaces and stoves in case of malfunction. CO alarms / sensors often complement a smoke alarm.

It normally occurs in work environments where hot work takes place such as welding. The Norwegian Labor Inspection Authority states an action limit of 25 ppm on average over eight hours

The oxygen level in air is about 21%. Reduced levels of oxygen are among other places used in museum magazines.

Reduced oxygen levels reduce the risk of fire and oxidation.

With a built-in PIR sensor, we can detect if there are people in the room, and in that way provide the building information system with data on the use of rooms, and thus also the opportunity to control important parameters for, for example, light, ventilation and heating.