## 3 Results  
The results of the monitoring carried out within the selected rooms of the Uffizi Gallery are reported according to the type of analyzed parameter (i.e., air temperature and relative humidity, carbon dioxide concentration, total volatile organic compounds and biological pollutants).  
Figure 6 shows, for each analyzed room and monitoring period, the minimum, average, and maximum measured values for air temperature (t) and relative humidity (RH).  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Analyzed Rooms** & **Day** & **Notes** \\ \hline
**I floor** & & \\ \hline Verone I floor & 6 June 2019 & Museum open \\ Room 160 & 6 June 2019 & Museum open \\ Room 71 & 6 June 2019 & Museum open \\ \hline
**II floor** & & \\ \hline Room 10 & 3 June 2019 & Museum closed \\  & 5 June 2019 & Museum open \\ Entrance & 5 June 2019 & Museum open \\ Room 2 & 5 June 2019 & Museum open \\ Verone II floor & 5 June 2019 & Museum open \\ Room 35 & 3 June 2019 & Museum closed (only for t, RH and CO\({}_{2}\)) \\ Room 41 & 5 June 2019 & Museum open \\ \hline \hline \end{tabular}
\end{table}
Table 7: Schedule of IAQ measurements in the Uffizi Gallery of Florence.  
Figure 5: Equipment for IAQ monitoring positioned in a representative room of the Uffizi Gallery (Room 160).  
The values were compared with narrow ranges considered acceptable for both artwork conservation (paintings--19 \(\div\) 24 \({}^{\circ}\)C for temperature and 45 \(\div\) 65% for relative humidity [30]) and for the comfort of people (20 \(\div\) 26 \({}^{\circ}\)C for temperature and 40 \(\div\) 60% for relative humidity [20,21]), i.e., 20 \(\div\) 24 \({}^{\circ}\)C for temperature and 45 \(\div\) 60% for relative humidity.  
Figure 7 shows, for each analyzed room and monitoring period, the minimum, average and maximum measured values for carbon dioxide concentration, which were compared with value ranges considered acceptable for people, i.e., 1000 ppm [12].  
Figure 6: Minimum, average and maximum measured values for temperature (t [\({}^{\circ}\)C]) and relative humidity (RH [%]) compared together with recommended values.  
Figure 7: Minimum, average and maximum measured values for carbon dioxide concentration (CO\({}_{2}\) [ppm]) compared together with value ranges considered acceptable for people.  
In Figure 8, for each analyzed room, the measured values for VOCs concentration are reported and compared with comfort (<0.200 mg/m\({}^{3}\)) and acceptable (0.200 \(\div\) 3 mg/m\({}^{3}\)) values for these pollutants [10; 12]. For Room 10, one of the most visited areas, samples were also taken on a closed day of the museum (3 June 2019), during which there was only one guided tour by a small group of visitors at 11:00, while the measurement of 13:00 refers to the museum totally without visitors.  
Figure 9 reports, for each analyzed room, the results of the sampling carried out for biological pollutants compared with reference values reported in Table 4. The results expressed in CFU/m\({}^{3}\) were obtained from active sampling, while those expressed in CFU/PT90 refer to passive sampling of TBL and mold. The greater concentration detected by active sampling compared to passive is a natural consequence of the sampling technique: passive sampling does not force the capture of microorganisms and, thus, lower values are expected.  
Figure 8: Sampled values for VOCs (mg/m\({}^{3}\)) in the analyzed rooms of the Uffizi Gallery compared with comfort (<0.200 mg/m\({}^{3}\)) and acceptable (0.200 \(\div\) 3 mg/m\({}^{3}\)) values for people.  
Figure 9: Values for biological pollutant sampling in the analyzed rooms of the Uffizi Gallery compared with reference values for TBL and molds.