11/08/2011 10:46 am ET | Updated Jan 08, 2012

Why Traffic Jams Are Bad For Your Health

Congested cities are fast becoming test tubes for scientists studying the impact of traffic fumes on the brain.

As roadways choke on traffic, researchers suspect that the tailpipe exhaust from cars and trucks--especially tiny carbon particles already implicated in heart disease, cancer and respiratory ailments--may also injure brain cells and synapses key to learning and memory.

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