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Childhood asthma rates are highest in parts of New York City where tree density is lowest, but the rate of asthma fell by 25% for every 340 trees per square kilometer.

G.S. Lovasi, J.W. Quinn, K.M. Neckerman, M.S. Perzanowski, A. Rundle

“Children living in areas with more street trees have lower prevalence of asthma,” Journal of Epidemiology and Community Health. 2008 Jul; 62(7): 647–649.

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