trees and the link to low asthma rates

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trees and the link to low asthma rates

Post  Fran on Sat May 03, 2008 8:20 am

Turns out trees are not only good for the environment but for those suffering asthma. Just found this article courtesy of - http://tiny.cc/m9DIx

Here's a bit but there's more on that link.

Researchers from Columbia University in New York who surveyed rates of asthma in children aged four and five found it was highest in parts of the city where tree density was lowest. The rate of asthma fell by a quarter for every extra 340 trees per square kilometre, a pattern that held true even after taking account of differing sources of pollution, levels of affluence and population density.

It is the first time that tree density has been linked with asthma. Trees produce pollen which may exacerbate asthma in children who already have the condition but is not thought to cause it to develop. The researchers found that areas with a high number of trees not only had lower levels of asthma but also a lower rate of hospital admissions among children already diagnosed with the condition, though this was statistically non-significant. Any effect of the tree pollen appeared to be counteracted by the beneficial effect of the trees in other ways.

The findings are reported in The Journal of Epidemiology and Community Health.
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