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Mass concentrations of particulate matter (PM) fractions were measured in   educational buildings in the city of Niš, Republic of Serbia. Two sampling   campaigns were conducted in winter periods. The first campaign was in the   period from 21 February to 15 April 2010 at the Faculty of Occupational   Safety (FOS) and the second campaign was from 20 March to 4 April 2013 at the   primary school Vožd Karađorđe (VK). PM measurements were carried out with low   volume samplers Sven/Leckel LVS3. The average daily PM10 concentration inside   the FOS (47.0 ±21.8 μg/m3) was lower than PM10 concentration in outdoor air   (50.7 ±28.1 μg/m3). The average daily PM10 concentration inside the VK (54.6   ± 17.6 μg/m3) was higher than in outdoor air (47.9 ± 22.8 μg/m3). The 24   hours average PM10 concentrations at FOS exceeded the EU limit value (50   mg/m3) during 34 % of days outdoors, and 39 % of days indoors. The 24 hours   average PM10 concentrations at VK exceeded the limit value during 35 % of   days outdoors, and 53 % of days indoors. The 24 hours average PM2.5   concentrations at VK exceeded the WHO daily mean guideline value (25 mg/m3)   during 71 % of days outdoors, and 88 % of days indoors. The average PM10 I/O   ratio at VK was 1.57 during teaching hours, and 1.00 during no teaching   hours. Similarly, average PM2.5 I/O ratio at VK was 1.11 during teaching   hours and 0.90 during no teaching hours. Average daily PM2.5/PM10 ratio in   the ambient air at VK was 0.87, and 0.82 at FOS. Very strong correlations   between the indoor and outdoor PM concentrations were observed at VK during   no teaching hours (r>0.8). Moderate to strong negative correlations were   found between the wind speed and PM at both schools. High outdoor PM   concentrations and resuspension of particles are probably the most possible   reasons for the elevated indoor PM concentrations found in the study.   [Projekat Ministartsva nauke Republike Srbije, br. III42008: Evaluation of   Energy Performances and Indoor Environment Quality of Educational Buildings   in Serbia with Impact to Health

Mass concentrations and indoor-outdoor relationships of PM in selected educational buildings in Nis, Serbia