Pollen counts are rising. Here's which cities will be hit the hardest    USA Today Are regional allergy seasons getting worse?    The Seattle Times In Duluth, climate change has extended the allergy season by 5 weeks    Duluth News Tribune A Major Pollen Surge Is Coming—These 20 US Cities Will Be Hit Hardest    marthastewart.com Where are pollen levels the highest? Iowa's capital city ranks among the worst    KCCI