But goldenrod is innocent. The worst culprit is ragweed. Found throughout Minnesota except the Arrowhead region, ragweed (Ambrosia artemisiifolia) normally grows anywhere from one to five feet ...

“Ragweed pollen is a particular type of pollen that has its highest counts in mid-September and can cling to fallen leaves or be kicked up into the air by raking and/or playing in leaf piles ...