Researchers from Harvard university studied 200 children from Boston and found that IQ scores of children in polluted area were 3 points lower than those in cleaner areas even after allowing for socio-ecomomic factors.
It is known that in animals, particles from traffic fumes can go along the olfactory nerve from nose to brain where particles can cause brain tissue inflammation.
Damage like that seen in Alzheimer's disease patients has been seen in dogs in heavily polluted areas of Mexico City.
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