Abstract
This study addresses the concentration of particulate matter and their size using a statistical analysis of data obtained inside seven schools located in the towns of Castellón (S1, S2, and S3), Alcora (S4, S5, and S6) and Lucena (S7) in northeast Spain. Samples were taken for five to eight hours, depending on school hours, to obtain a monthly sample for each school. The main goal of this study is to assess the differences depending on the type of location and the sampling point to be able to design corrective measures that improve the habitability and safety of the teaching spaces analyzed. The lowest concentrations of fine particulate matter, less than 2.5 µm, were registered at the rural location. The values of these particles found in industrial and urban locations were not substantially different. In the case of particulate matter between 2.5 and 10 µm, significant differences were observed between the three types of locations. The lowest concentrations of particles larger than 10 µm were registered at the rural location, and the highest concentrations were found at the industrial locations. Among the urban stations, the particle concentration of this fraction in station S2 was significantly higher than that in stations S1 and S3, which had similar concentrations. These values are also similar to those registered at school S6, which is at an industrial location. The resuspension of particles from both indoor sources as well as those transported from the outside is an important factor in the concentrations of particles inside classrooms.
Highlights
The concentration of particulate matter in the air inside a building is typically influenced by several factors such as the indoor generation of particles, the concentration of particles outside, the air exchange, the air exchange rate and the sedimentation characteristics of the particles [1,2]
A total of 420 samples were obtained from three areas that in principle were very different regarding the quality of their air: the town of Castellón, which corresponds to an urban area, the town of Alcora, with the attributes of a ceramic industrial nucleus, and the town of Lucena, in a rural area
The first elements analyzed were the differences in the concentration levels of indoor particulate matter between the different types of locations
Summary
The concentration of particulate matter in the air inside a building is typically influenced by several factors such as the indoor generation of particles, the concentration of particles outside, the air exchange, the air exchange rate and the sedimentation characteristics of the particles [1,2]. There are a variety of sources of particles from heating, furniture, cleaning, resuspension, etc. To what happens in the outdoor atmospheric ambience, inside the buildings, particle size is determined by the sources of emission. The main origin of particle fractions smaller than 1 μm is the outdoor air, whereas the largest ones mainly come from activities conducted inside [5]. Coarse particles (larger than 2.5 μm) are generated inside buildings by activities such as cleaning, which can increase the resuspension of particles deposited
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