With so few trees in some urban areas, it is a puzzle why so many city dwellers suffer more than rural residents from debilitating allergies. You can thank City Planners. Decades ago, all-male trees were planted in urban areas for landscaping. Unlike female trees, male trees and shrubs do not drop messy fruit, seeds or pods. Male trees just emit pollen.
http://www.theurbanshopper.com/article_detail.php?article_id=128
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Sneezing in the City? Here’s Why
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