NDLI: Airborne Particulate Matter in School Classrooms of Northern Italy

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Airborne Particulate Matter in School Classrooms of Northern Italy

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Airborne Particulate Matter in School Classrooms of Northern Italy

Content Provider	MDPI
Author	Rovelli, Sabrina Cattaneo, Andrea Nuzzi, Camilla Spinazzè, Andrea Piazza, Silvia Carrer, Paolo Cavallo, Domenico
Abstract	Indoor size-fractioned particulate matter (PM) was measured in seven schools in Milan, to characterize their concentration levels in classrooms, compare the measured concentrations with the recommended guideline values, and provide a preliminary assessment of the efficacy of the intervention measures, based on the guidelines developed by the Italian Ministry of Healthand applied to mitigate exposure to undesirable air pollutants. Indoor sampling was performed from Monday morning to Friday afternoon in three classrooms of each school and was repeated in winter 2011–2012 and 2012–2013. Simultaneously, PM2.5 samples were also collected outdoors. Two different photometers were used to collect the PM continuous data, which were corrected a posteriori using simultaneous gravimetric PM2.5 measurements. Furthermore, the concentrations of carbon dioxide (CO2) were monitored and used to determine the Air Exchange Rates in the classrooms. The results revealed poor IAQ in the school environment. In several cases, the PM2.5 and PM10 24 h concentrations exceeded the 24 h guideline values established by the World Health Organization (WHO). In addition, the indoor CO2 levels often surpassed the CO2 ASHRAE Standard. Our findings confirmed that important indoor sources (human movements, personal clouds, cleaning activities) emitted coarse particles, markedly increasing the measured PM during school hours. In general, the mean PM2.5 indoor concentrations were lower than the average outdoor PM2.5 levels, with I/O ratios generally <1. Fine PM was less affected by indoor sources, exerting a major impact on the PM1–2.5 fraction. Over half of the indoor fine particles were estimated to originate from outdoors. To a first approximation, the intervention proposed to reduce indoor particle levels did not seem to significantly influence the indoor fine PM concentrations. Conversely, the frequent opening of doors and windows appeared to significantly contribute to the reduction of the average indoor CO2 levels.
File Size	679936
Ending Page	1421
Page Count	24
Starting Page	1398
File Format	PDF
e-ISSN	16604601
DOI	10.3390/ijerph110201398
Journal	International Journal of Environmental Research and Public Health
Issue Number	2
Volume Number	11
Language	English
Publisher Date	2014-01-27
Access Restriction	Open
Subject Keyword	school environment indoor PM sources PM exposure assessment exposure mitigation intervention measures risk management
Content Type	Text
Resource Type	Article

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