## 4 Discussion
On the other hand, there are only a few expert research studies that would provide information on targeted air modification (other than ventilation) in the internal environment in the production process and the interaction, e.g., that the treated air positively or negatively consciously or unconsciously affects labor productivity, respectively. Published research shows that the indoor environment is important for people's health and comfort [46; 47; 48; 49]. Another major research area directly related to the quality of the workspace is the influence of emotions on the workplace [50; 51]. The state of the literature shows that affect matters because people are not isolated 'emotional islands.' Rather, they bring all of themselves to work, including their traits, moods, and emotions, and their affective experiences and expressions, which influence others. Emotional intelligence is not a buzz word only familiar in psychology and education, but is now talked about in business circles as well. From the studied published results of research, partial research, or studies that deal with IAQ (Indoor Air Quality), The IEQ (Indoor Environmental Quality) shows that the authors examined this issue through questionnaire surveys among employees working mostly in administrative buildings [28; 39] and open space offices [26], in laboratory conditions and call centers [46], or residential buildings with air pollutants such as Radon, volatile organic compounds (VOCs) and carbonyl compounds [50]. Interesting research was conducted by [PERSON] et al. [52] in open space offices. They positively evaluated the effect of indoor plants on the thermal comfort of office workers within an office building. Numerous research studies have found that plants have a positive impact on people with respect to a diverse range of performance categories, for example [53; 54; 55; 56]. [PERSON] and [PERSON] [43] critically evaluated approximately 100 expert articles on the indoor environmental quality on human health and performance and found that there is a relationship between SBS (sick building symptoms) and work performance. The longer the internal environment is ventilated, the more illness and sickness decrease [56; 57; 58; 59; 60; 61; 62; 63; 64]. They also found a direct relationship between ventilation and the work output, but this performance increases only to a certain extent, up to about 30 L/s/person, then the curve acquires a saturated character. All it takes is a lower value of approx. 5 L/s and the performance increases sharply. Although the results are not statistically unambiguous, they nevertheless show that the parameters examined are related to the design of the building and the ventilation of the work areas. In this paper, they have shown that it is possible, with existing data, to estimate quantitative relationships between ventilation rate and illness-caused absence and to quantitatively estimate how work performance is related to ventilation rate, air temperature, and perceived air quality. Similarly, a paper by [PERSON] et al. [44] looks at 110 literary sources focused on non-industrial buildings. In developed countries, people spend almost 90% of their time inside buildings, where most of their activities take place [62]. Inclusion criteria regarded (acoustic, thermal, visual, and air quality) the investigation of interaction effects between two or more environmental factors in occupant comfort perception and performance and the impact of one environmental factor on the perception of other environmental aspects (crossed effects). The effects of moderate heat stress and open-plan office noise distraction on SBS symptoms and the performance of office workers have been shown by [PERSON] et al. [64]. They demonstrated that open office noise distraction, even at the realistic level of 55 dBA, increases fatigue and has many negative effects on the performance of office work, as does a moderately warm air temperature.