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Allergy
From Page 10
This scale has been adopted by the USDA Forestry Effects Model for ranking the allergy potential of entire cities.
According to Ogren, at the same time the percentage of asthma and allergies cases began to grow in America, municipalities across the U.S. had already begun planting only male species of trees and shrubs.
The key to an allergy-free garden, he said, is planting only female species in a yard.
Female species, if polli
97.3%