SmogSmart?

It seems that pollution affects intelligence in a negative manner.  But I wonder if all the possible interpretations for these data have been drawn.  The result seems significant enough, but as with every study I've seen, in an effort to be specific enough to prove a hypothesis, it's too narrow in scope to eliminate all the other variables.

My hypothesis is that parents with slightly higher potential and actual intelligence would be more aware of the ill effects of pollution in general, and would tend to avoid those areas of higher pollution.  They would be earning slightly more and thus more able to afford to avoid such areas.  They would also be slightly more aware of the need for proper and balanced nutrition, so if I was running the study I'd also be checking the parents' incomes and the health levels of the children and seeing if the more intelligent children show signs of better nutrition. (As opposed to the signs of less pollution exposure.)

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