Story thread · 2 reports / 2 sources

This is where pollen is forecast to surge in the US this fall

independent.co.uk · 3hShare

Ragweed is the biggest culprit of fall allergies - a single plant can produce up to a billion grains of irritating pollen that can travel hundreds of miles

First report: Health officials urge preparation as pollen levels begin to rise — wsoctv.com, 1d