Geoffrey Donovan, a research forester with the Pacific Northwest Research Station, used public health data, crime statistics, tax records aerial photos and other information in the two studies. He found that women who live in houses with more trees are less likely to have underweight babies. The study on crime revealed a more complex relationship. Larger trees, including trees located near the street, are associated with a lower incidence of property crimes. Larger numbers of smaller trees -- especially trees planted near the home, which may provide a screen for burglars -- are associated with higher crime.

Cities within the Portland Metropolitan Area are using this information as they rewrite street tree regulations. Likewise, local crime prevention programs and tree planting advocates are sharing the findings with urban residents.

Based on science by Geoffrey Donovan