Not only are fossil-fuel emissions bad for the planet and for your lungs, but they may also harm your baby's developing brain. A new study published in the journal Pediatrics links mothers' exposure to high levels of environmental pollutants during pregnancy to a four-point drop in children's IQ scores by age 5

Read more:

http://www.time.com/time/health/article/0,8599,1912197,00.html

Read Full Study:

http://pediatrics.aappublications.org/content/early/2009/07/20/peds.2008-3506.full.pdf