"Latitudinal effects on increasing season length were associated primarily with a delay in first frost of the fall season and lengthening of the frost-free period," the study said. "Overall, these data indicate a significant increase in the length of the ragweed pollen season by as much as 13-27 days at latitudes above 44 degrees north since 1995."
Scientists used pollen measurements from the US National Allergy bureau and Canada's Aerobiology Research Laboratories, combined with data from US weather stations, Environment Canada and the Canadian National Climate Data and Information Archive.
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