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Lung cancer, heart disease, nausea, headaches, allergic reactions and chronic respiratory disease are just some of the adverse effects of air pollution. Now you can add less intelligent kids to the list. Two separate scientific studies, one conducted in New York City and the other in Poland, found that 5-year-olds exposed to above-average levels of polycyclic aromatic hydrocarbons (PAHs) in the womb score lower on IQ tests. The difference is about the same as the well-documented IQ drop caused by low-level lead exposure.