In work environments where various sectoral activities are carried out, indoor health and air quality have become a complex issue concerning medicine, psychology and engineering sciences.

The lack of air in the working environment or the presence of a number of gases, dust and odors in the air causes unhealthy employees, decreases the thermal well-being of employees and naturally reduces the working efficiency. The effects of these environments on employees' bodies can be very different. For example, difficulty breathing, burning in the eyes, stuck in the chest, or increased airborne discomfort. Especially chronic or subsequent health problems are very difficult to detect in the first stage. Research has shown that low air quality in the working environment is associated with subsequent acute or chronic health problems. Inadequate or unsuitable ventilation conditions, lack of heating, cooling or air conditioning systems cause some discomfort.

The main factors affecting indoor quality are:

• Humidity of air: Humidity in air should not be 20 or less.
• Air pollutants: Indoor air, cigarette smell, fungus, vaporizable organic compounds or semi-vaporizable organic compounds, pesticides, nitrogen oxides, carbon monoxide, karbon dioxide, radon and similar substances.
• Outside air quality: Short or long air concentrations of the outside air also affect the working environment air.

The indoor air quality can be kept under control in working environments. As long as the reasons and quantities can be determined. Air quality measurements are also carried out in authorized laboratories within the scope of indoor measurements. Laboratories operate in accordance with current legal regulations and standards published by domestic and foreign organizations. For example,

• TS CR 1752 Ventilation - Design rules for indoor environments for buildings
• ASHRAE 62-1999 Indoor Air Quality