City-dwellers are intimately familiar with the pros and cons of living with neighbors. Their heavy footsteps thunder overhead, their loud music penetrates the walls, and strange odors sometimes drift down the halls. These are nuisances, no doubt, but not all neighborly disturbances are so innocuous.
Consider, for example, communities across the country that live near chemical plants, paper mills and other polluting industries. Air pollution from these industrial neighbors often results in higher rates of asthma and other serious illnesses in local communities.