huh... intersting. Did they control for diet or medication in the expectant mothers? Did they also look at other factors such inherited traits?
I'm not saying there isn't a link with pollution, but there is definitely a link when it comes to nutrition. I woud think anything that becomes ingested (including pollution) by mom would effect the brain development (among other things) of an unborn baby.
I actually read this article today. The interviewees are mostly late teens, early twenties, unemployed and of diverse backgrounds. NYS and NYC provide very well for nutritional needs.