Carried out throughout the COVID19 pandemic; therefore, there measurements have been taken weekly in numerous places and depended on facility availability. were some restrictions regarding the through winter measuring devices. Thus, the Measurements were performed weekly installation of (December)–(W), spring (April)– measurements have been taken weekly in numerous places and depended on facility availabil (S), and at the finish of spring (June)–(LS). ity. Due to the presence of kids inweekly during winter (December)–(W), period Measurements were carried out various rooms during the day, the days spring (April)–(S), and in the end of spring (June)–(LS). had been divided into 3 components: As a result of presence of children in different rooms in the course of the day, the days period Morning time (MT), playtime within the playroom; have been divided into three components: Nap time (NT) inside a committed sleeping space;Morning time (MT), playtime within the playroom; Afternoon time (AT), playtime inside the playroom.Energies 2021, 14,five ofTable two shows the measurement dates and measurement periods.Table 2. Measurement periods for the four study groups. Nursery (Study Group) Indoor and outdoor air quality assessment Winter time (W) Spring time (S) Late spring time (LS) Morning time (MT) Nap time (NT) Afternoon time (AT) Website traffic assessment Winter time (W) Late spring time (LS) 1 December 2020 7 June 2021 4 December 2020 eight December 2020 193 April 2021 071 June 2021 8:001:00 11:003:00 13:005:00 eight:001:00 11:003:00 13:005:00 Nap time in the exact same space (11:304:00) 026 December 2020 B1 B2 B3 B- -8:006:- -8:001:30 11:303:30 13:306:–2.4. Indoor and Outside Air High quality Assessments two.four.1. Measuring Devices For air top quality measurements, measuring equipment was utilised for continuous monitoring in the following air parameters: particulate matter concentration PM2.5, PM10 ( /m3), Phenthoate Technical Information Temperature ( C), relative humidity, in indoor and outside air, along with the indoor concentration of carbon dioxide (ppm). Measurements had been produced with NEMo Outdoor and NEMo XT mini devices by Ethera (France). The devices have been calibrated. The accuracies and measuring ranges in the devices applied are listed in Table 3.Table 3. Measuring device qualities utilized for IAQ and OAQ measurements. Parameter Detection method Measuring range Carbon dioxide Resolution Accuracy Detection strategy Temperature Measuring range Resolution Accuracy Detection approach Relative humidity Measuring range Resolution Accuracy Detection strategy PM2.5/PM10 Measuring variety Resolution Accuracy NEMo XT Mini NEMo Outside Non-dispersive infrared spectrometry 0000 ppm 1 ppm0 ppmCMOS (Complementary Metal-Oxide-Semiconductor) (-55)125) C 0.08 C.5 CCapacitive 05 0.08Laser-based light scattering 0000 /m3 1 /mEnergies 2021, 14,six ofDevices for monitoring opening windows have been also made use of, which registered the opening of a window in the zero ne system, an open window (1), as well as a closed window (0). two.four.2. Methodology Air high quality was assessed in terms of CO2 concentration and particulate matter. The typical concentrations of these selected indicators have been determined during the children’s stay inside the nursery, accounting for the time of their remain within the playroom and sleeping space. The assumed evaluation criteria for very good IAQ are as follows:The typical concentration of CO2 below1200 ppm, as well as the Sulfentrazone Cancer maximum concentration below 1500 ppm; The maximum concentration of PM10 beneath 50 /m3 ; The maximum concentration of PM2.five below 25 /m3 .The ratio from the indoor and outside concentra.