This post from Mother Nature Network lists the 12 cities that are the worst for allergy sufferers.
Greensboro, Columbia, and Dayton are among the "12 worst U.S. cities out of 100 ranked by the Asthma and Allergy Foundation of America (AAFA) for allergy sufferers for the 2011 spring season."
The list is mostly based on pollen and mold counts.
FULL STORY: 12 worst U.S. cities for allergy sufferers
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