CO₂ is part of the human metabolism. It is produced when, for example, carbohydrates are metabolized to generate energy. The produced CO₂ is then transported out of the body by respiration. The CO₂ concentration in the inhaled air is decisive for the metabolism. Depending on the level of the concentration in the air breathed in, various symptoms can occur that affect daily life and health.

High CO₂ concentrations in the air we breathe lead to concentration problems and fatigue. The performance potential of people in the room decreases constantly the higher the amount of CO₂ in the air gets. Furthermore, CO₂ concentrations relate to the potential of virus infections.

Do you find it hard to breathe in your home some days? Are you more prone to headaches and asthma attacks during the summer months? You’re not allergic to heat - but you may have serious humidity problems in your home or office. When we talk about indoor air quality, humidity is one of the main things we’re referring to.

Too high or too low humidity levels in closed spaces can lead to various issues. For example, bacteria and viruses that cause respiratory infections thrive in extremely high and extremely low humidity. Mold spores, dust mites and other allergens survive best in high humidity environments. Furthermore, higher humidity can increase the levels of noxious chemicals in the air, which may include ozone and formaldehyde.

VOCs originate from a number of different possible sources, like building materials, tobacco smoke, people and their activities, and indoor chemical reactions. Exceptionally high VOC levels are typically found in new buildings or after renovation. Further, when using products that contain VOCs, such as air fresheners or cleaning agents, people expose themselves and others to high pollutant levels that can persist long after the activity has finished.

A number of systematic human exposure studies have shown various adverse health
effects caused by exposure to elevated VOC levels. Among the effects reported by participants are dryness and irritation of the eye, the nose and the throat, headaches, and dizziness.

Particulate Matter (PM) is a complex mixture of solids and aerosols composed of small droplets of liquid, dry solid fragments, and solid cores with liquid coatings. Particles are defined by their diameter for air quality regulatory purposes. Those with a diameter of 10 microns or less (PM10) are inhalable into the lungs and can induce adverse health effects.

A number of adverse health impacts have been associated with exposure to PM2.5. Short-term exposures (up to 24-hours duration) have been associated with premature mortality, increased hospital admissions for heart or lung causes, acute and chronic bronchitis, asthma attacks, emergency room visits, respiratory symptoms, and restricted activity days.