Extremely tiny particles — a human hair is at least 30 times as large as the largest particle — may travel from the nasal cavities to the brain via the olfactory system, putting the brain’s immune system on high alert. Or pollutants may lodge in the lungs, causing an inflammatory response that spreads and leads to the brain.
Pollutants can also damage the cardiovascular system, which is essential to brain health. (Links between air pollution, stroke and heart disease are
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