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Polycyclic aromatic hydrocarbons in primary school environments: Levels and potential risks.

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Childrens cancer risk from indoor polycyclic aromatic hydrocarbons (PAHs) in Portuguese schools is high. Indoor PAH levels, primarily from traffic, significantly exceed safety guidelines, posing a greater risk than outdoor exposure.

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Area of Science:

  • Environmental Health
  • Air Quality Monitoring
  • Toxicology

Background:

  • Polycyclic Aromatic Hydrocarbons (PAHs) are significant indoor air pollutants with limited exposure data.
  • Children in primary schools are a vulnerable population for air pollution health effects.

Purpose of the Study:

  • To quantify indoor and outdoor polycyclic aromatic hydrocarbon (PAH) levels in Portuguese primary schools.
  • To assess the associated cancer risk for students (aged 8-10 years) and compare it with school personnel.
  • To identify the primary sources of indoor PAHs in the school environment.

Main Methods:

  • Collected particulate-bound (PM2.5) PAHs (18 compounds) indoors and outdoors at ten urban primary schools.
  • Analyzed PAH concentrations using established methods during January-April 2014.
  • Calculated cancer risk using USEPA and WHO guidelines.

Main Results:

  • Total mean indoor PAH concentrations ranged from 2.8-54 ng/m³, with outdoor levels from 7.1-48 ng/m³.
  • Lighter PAHs originated indoors, while heavier PAHs infiltrated from outdoor air; traffic emissions were the main source.
  • Student cancer risk from indoor PAH exposure was 2-10 times higher than outdoors, exceeding health guidelines significantly.

Conclusions:

  • Indoor PAH exposure in primary schools presents a substantial cancer risk to young children.
  • Traffic emissions are a major contributor to indoor PAHs in educational settings.
  • Urgent mitigation strategies are needed to reduce indoor PAH levels and protect student health.