High levels of city pollution linked to brain damage in children

November, 2011
  • A small Mexican study provides more evidence for the negative effect of pollution on developing brains, with cognitive impairment linked to reduced white matter in specific regions.

In yet another study of the effects of pollution on growing brains, it has been found that children who grew up in Mexico City (known for its very high pollution levels) performed significantly worse on cognitive tests than those from Polotitlán, a city with a strong air quality rating.

The study involved 30 children aged 7 or 8, of whom 20 came from Mexico City, and 10 from Polotitlán. Those ten served as controls to the Mexico City group, of whom 10 had white matter hyperintensities in their brains, and 10 had not. Regardless of the presence of lesions, MC children were found to have significantly smaller white matter volumes in right parietal and bilateral temporal regions. Such reduced volumes were correlated with poorer performance on a variety of cognitive tests, especially those relating to attention, working memory, and learning.

It’s suggested that exposure to air pollution disturbs normal brain development, resulting in cognitive deficits.

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