In health news, a new study in the journal Pediatrics has linked air pollution exposure before birth with lower IQ scores in childhood, bolstering evidence that smog may harm the developing brain. The authors of the study tracked 249 children of New York City women who wore backpack air monitors for forty-eight hours during the last few months of pregnancy. At age five, before starting school, the children were given IQ tests. Those exposed to the most pollution before birth scored on average four to five points lower than children with less exposure.