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Microplastic occurrence in settled indoor dust in schools.

Mohammad Javad Nematollahi1, Fatemeh Zarei1, Behnam Keshavarzi1

  • 1Department of Earth Sciences, College of Sciences, Shiraz University, 71454 Shiraz, Iran.

The Science of the Total Environment
|October 17, 2021
PubMed
Summary

Microplastics (MPs) are prevalent in Shiraz schools, averaging 195 MPs per gram of dust. Young students face high exposure risks, particularly from microfibers found in settled indoor dust.

Keywords:
Human exposureIranMicrofibrePCAShiraz

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Area of Science:

  • Environmental Science
  • Toxicology
  • Public Health

Background:

  • Microplastics (MPs) are a growing environmental concern, with indoor dust identified as a potential exposure pathway.
  • Limited research exists on MP characteristics and human exposure within indoor environments like schools.

Purpose of the Study:

  • To investigate the characteristics and human exposure of microplastics in settled indoor dust in schools.
  • To determine the types, abundance, and distribution of MPs in school dust samples.
  • To assess the potential exposure risks for elementary school students.

Main Methods:

  • Collected settled indoor composite dust samples from 28 schools in Shiraz.
  • Analyzed dust samples for microplastic identification, quantification, and characterization (type, size, morphology).
  • Utilized Principal Component Analysis (PCA) to correlate MP characteristics with sampling site factors.

Main Results:

  • An average of 195 MPs per gram of dust was detected.
  • White-transparent microfibers were the most abundant MP type, with polyethylene terephthalate and polypropylene being dominant.
  • Higher MP concentrations were found in the south and center of Shiraz, correlating with population density, traffic, and industrial activity.
  • Microfibers were predominantly associated with southern sites, while MP sheets and fragments were found in northern sites.

Conclusions:

  • Microfibers are widespread in Shiraz schools, posing a significant exposure risk to young students.
  • Factors such as wind direction and topography influence MP distribution.
  • Indoor settled dust in schools represents a critical reservoir for microplastic exposure, particularly for vulnerable populations.