## 3 Results
### Fungal Aerosol Concentration  
Detailed values of fungal aerosol concentrations (CFU/m\({}^{3}\)) are presented in Table 2, while the percentage values of individual fractions of bioaerosol in the Krakow and Tarnow stables are shown in Figures 2 and 3, respectively. As shown in Table 2, the highest concentrations of all fractions of fungal aerosol (and therefore total and respirable fraction) in the Krakow stable were observed during the feeding of horses. The observed concentrations during this activity were from 44 times higher than those observed during mid-day lack of activity (indoor background) for fraction F5 to even 344 times higher for fraction F2. The concentration of total fungal aerosol during feeding was 82 times higher than this recorded during mid-day, while respirable fraction was 68 times higher during feeding than during mid-day lack of activity. In the Tarnow horse stable, the highest concentrations of all fractions of fungal aerosol were observed during indoor activity (e.g., cleaning). However, the lowest concentrations were observed in the early morning, rather than in the case of indoor background. The highest concentrations of fungal aerosol were from 5 times higher from the lowest values (early morning) for fraction F1 to 32 times higher for fraction F6. What is also clear from Table 2 is that the fungal aerosol concentrations were much higher in the Krakow than in the Tarnow stable (differences statistically not significant at \(p\) < 0.05). These regularities are contrary to those observed in the case of particulate matter (i.e., much higher values recorded in Tarnow than in Krakow). What can be seen in Figure 2 is that the share (%) of fine fractions of fungal aerosol (from 0.65 to 3.3 \(\upmu\)m) predominate during different times of day, in both stables, but in varying proportions. In the Krakow stable, the share of the three smallest fungal aerosol fractions (i.e., from 0.65 to 3.3 \(\upmu\)m) was the highest in the morning (84%), then dropped during feeding to 36%, then increased during the day to 51% (indoor background) and 75% during afternoon activities. What also needs to be noted is that the share of the three smallest fractions outdoors reached as much as 90%. In the Tarnow stable, on the other hand, the smallest share of the three finest fractions was observed in early morning (26%), then increased during feeding to 77%, but then dropped to 59% (mid-day, indoor \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Time of Day**} & \multicolumn{2}{c}{**Early Morning**} & \multirow{2}{*}{**Feeding**} & \multicolumn{2}{c}{**Mid-Day**} & \multirow{2}{*}{**Activity**} & \multicolumn{2}{c}{**Outdoor**} \\  & \multicolumn{2}{c}{**(No Activity)**} & & & & & & & **Background** \\ \hline
**Horse Stables** & **Kraków** & **Tarnów** & **Kraków** & **Tarnów** & **Kraków** & **Tarnów** & **Kraków** & **Tarnów** \\ \hline PM\({}_{10}\) & **19 (1)** & 54 (1) & 16 (1) & 57 (1) & 10 (1) & 62 (1) & **19 (1)** & **109 (2)** & 28 (2) & 36 (0) \\ PM\({}_{2,5}\) & 13 (1) & 46 (1) & 14 (1) & 47 (0) & 9 (1) & 51 (1) & **18 (1)** & **86 (5)** & 20 (1) & 32 (1) \\ PM\({}_{1}\) & 6 (1) & 29 (1) & 6 (1) & 29 (1) & 5 (0) & 32 (2) & **10 (1)** & **33 (3)** & 15 (2) & 20 (0) \\ Respiplable dust & 19 (2) & 74 (0) & 19 (1) & 76 (1) & 14 (1) & 82 (2) & **27 (1)** & **119 (8)** & 35 (1) & 52 (1) \\ Temperature & 7 & 3 & 8 & 7 & **11** & 8 & 8 & 7 & 5 & 2 \\ Relative humidity & **70** & 60 & 63 & 71 & 55 & 53 & 64 & 62 & 69 & 72 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Mean values of particulate matter concentration (\(\upmu\)g/m\({}^{3}\)) along with temperature (\({}^{\circ}\)C) and relative humidity (%) in the examined horse stables and outdoors. The presented values are means of six replicates from one hour intervals. Values in brackets show standard deviation. The highest values recorded indoors are shown in bold. background) and 53% during afternoon activities. The outdoor concentration of the finest fractions was 52%.