Pollution link with birth weight
Traffic pollution was identified as a significant problem
Exposure to traffic pollution could affect the development of babies in the womb, US researchers have warned.
They found the higher a mother\'s level of exposure in early and late pregnancy, the more likely it was that the baby would not grow properly.
...
[Baltimore Spokes: Note that being in a car you are exposed to more traffic pollution then if you are riding your bike in traffic.]
<a href="http://news.bbc.co.uk/2/hi/health/7988619.stm">http://news.bbc.co.uk/2/hi/health/7988619.stm</a>