Alzheimer's-like brain changes seen in young who breathed polluted air.
http://www.environmentalhealthnews.org/ehs/newscience/2011/12/2011-1227-air-pollution-alzheimers-young-adults/
http://www.environmentalhealthnews.org/ehs/newscience/2011/12/2011-1227-air-pollution-alzheimers-young-adults/
"A study examining postmortem brains of children and young adults suggests that exposure to air pollution causes changes in the brain that are similar to those seen in Alzheimer's patients."