Tree-lined streets may help childhood asthma rates

Young children who live in neighborhoods with lots of trees have lower rates of asthma than children who reside in areas with fewer trees, a new study finds.

...Nine percent of the young children in the study had asthma, and the city had an average of 613 trees per square kilometer. Asthma rates decreased by almost one-quarter for every standard deviation increase in tree density, equivalent to 343 trees per square kilometer, the study found. This pattern held true even after the researchers factored in sources of pollution, socioeconomic status and population density.

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