According to an article published in the Journal of Epidemiology and Community Health, lower rates of asthma are found in children who live on tree-lined streets. The pattern held constant, even changes were made in sources of pollution, levels of affluence, and population density, all of which would be considered likely to influence the results. The authors note that asthma rates in children can thus be curbed by encouraging them to play outdoors more, or by improving the quality of the air.

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