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Urban life can be trying--cars and buses honk, passersby jostle, concrete and brick win out over grass and trees. Researchers have known for decades that residents of densely populated areas have higher rates of mental illnesses, including anxiety disorders and schizophrenia

As compared to rural dwellers, urbanites are more stressed and more likely to develop schizophrenia.

Sprawl isn't just eating up the countryside--it's also blocking the breezes that would otherwise clear out air pollution. That's according to a new study of Houston from the National Center for Atmospheric Research, to be published in the Journal of Geophysical Research