Mahmoud Mohammadyan1, Ahmad Alizadeh-Larimi2, Siavash Etemadinejad1, Mohd Talib Latif3,4, Behzad Heibati 5, Kaan Yetilmezsoy6, Sabah Ahmed Abdul-Wahab7, Payam Dadvand8,9,10

  • 1 Health Sciences Research Center, Faculty of Health, Mazandaran University of Medical Sciences, Sari, Iran
  • 2 Faculty of Health, Mazandaran University of Medical Sciences, Sari, Iran
  • 3 School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi Selangor, Malaysia
  • 4 Institute for Environment and Development (LESTARI), Universiti Kebangsaan Malaysia, Selangor, Malaysia
  • 5 Health Sciences Research Center, Faculty of Health, Student Research Committee, Mazandaran University of Medical Sciences, Sari, Iran
  • 6 Department of Environmental Engineering, Faculty of Civil Engineering, Yildiz Technical University, Istanbul, Turkey
  • 7 Department of Mechanical and Industrial Engineering, College of Engineering, Sultan Qaboos University, Muscat 123, Sultanate of Oman
  • 8 ISGlobal, Centre for Research in Environmental Epidemiology (CREAL), Barcelona 08003, Spain
  • 9 Pompeu Fabra University, Barcelona 08003, Spain
  • 10 Ciber on Epidemiology and Public Health (CIBERESP), Madrid 28029, Spain

Received: April 16, 2016
Revised: July 22, 2016
Accepted: August 21, 2016
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Cite this article:
Mohammadyan, M., Alizadeh-Larimi, A., Etemadinejad, S., Latif, M.T., Heibati, B., Yetilmezsoy, K., Abdul-Wahab, S.A. and Dadvand, P. (2017). Particulate Air Pollution at Schools: Indoor-Outdoor Relationship and Determinants of Indoor Concentrations. Aerosol Air Qual. Res. 17: 857-864.


  • A real-time assessment of PM levels is conducted in six schools in different seasons.
  • Outdoor PM2.5 is the main predictor for all indoor particulate pollutants.
  • Indoor PM levels are recorded higher than outdoor concentrations.
  • Temperature and relative humidity are predictors of PM2.5 and PM10.
  • Windows’ area and number of students influence fine particles (PM1.0).



This study aimed to assess the relationship between indoor and outdoor particulate air pollution at primary schools, and identify the determinants of indoor pollution concentrations. The study was conducted in six classrooms within six primary schools in Sari, Northern Iran. Indoor concentrations of particulate matter (PM) with an aerodynamic diameter of less than 10 µm (PM10), 2.5 µm (PM2.5), and 1 µm (PM1.0) were assessed in classrooms, and outdoor concentrations of PM2.5 on the school playgrounds were monitored simultaneously by using two real-time and portable dust monitors during autumn, winter, and spring, yielding 26 sampling days for each school in total. The highest outdoor and indoor PM2.5 concentrations were found in winter and spring, respectively. The mean indoor PM2.5 concentration (46.9 ± 32.9 µg m–3) was higher than that measured outdoors (36.8 ± 33.2 µg m–3). Indoor PM2.5 and PM1.0 were moderately correlated with outdoor PM2.5 concentrations, which was the main determinant for all indoor particulate concentrations, however, a distinct pattern was observed for PM10 and PM2.5 compared to PM1.0. While meteorological variables (i.e., ambient temperature, relative humidity) could predict indoor PM10 and PM2.5 concentrations, the total area of the windows and the number of students in a classroom were predictors for PM1.0 levels. The findings of this study could inform policymakers in implementing evidence-based targeted interventions aimed at reducing air pollution in school settings.

Keywords: Classrooms; Particulate matter; PM2.5; PM10; Iran

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