A measure of how warm or cold the air is. The ideal temperature is between 19 and 24 degrees.

Carbon dioxide (CO₂) is a gas that occurs naturally in the atmosphere. The CO₂ content is expressed in PPM (parts per million). An excess of CO₂ displaces the oxygen uptake in our body. As a result, the body switches to a lower
energy consumption, leading to fatigue, headaches and loss of concentration. The ideal concentration of CO₂ in the air is 400 to 800 ppm and the limit value is set at 1200 ppm.

The ratio between the amount of water vapor present in the air and the maximum amount it could hold. A percentage between 40% and 60% is ideal. Excessive humidity can cause mold to form. Humidity that is too low is unfavorable for the condition of mucous membranes, eyes, nose and throat. It can also lead to reduced resistance to infections.

Collective name for a group of hydrocarbons that evaporate easily. These chemicals are found in other building materials, cleaning products and paint. Short-term exposure causes irritation of eyes and mucous membranes. At high
concentrations, health effects on organs cannot be ruled out. Ideal is a value below 500 PPB (parts per billion). Values above 1000 PPB should be avoided.

Collective name for the small particles in the air. It is invisible to the naked eye. Almost all human activities produce particulate matter, such as cooking and driving a car. The smaller the particle, the more harmful to health. Under PM 1 (particulate matter) you speak of ultrafine dust. Ultrafine particles end up in the lungs and are particularly harmful to children and adults with lung disorders. The standards of the
WHO for particulate matter are PM 10 and PM 2.5 and have a limit value of 50 uq (micrometers) m3 and 25 ug m3 respectively.

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