In a study of nine city neighborhoods, Portland State University scientists found a strong relationship between the presence of urban trees and the incidence of childhood asthma.
“Assessing the relationship among urban trees, nitrogen dioxide, and respiratory health,” Environmental Pollution, Volume 194, November 2014, Pages 96-104, ISSN 0269-7491, dx.doi.org/10.1016/j.envpol.2014.07.011.
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