Allergy sufferers could have it especially bad this autumn. Experts say a rainy summer has led to unusually high levels of ragweed pollen and mold in the air - especially in some parts of the U.S. Keep clicking to see the 12 cities that top the Asthma and Allergy Foundation's list of worst cities for fall allergies. The ranking takes into account pollen scores, medication use, and access to allergy specialists to create the annual rankings...