In fact, scientists have found ragweed pollen as high as 2 miles up in the atmosphere and over 400 miles out to sea.

Source: https://www.farmanddairy.com/columns/goldenrod-doesnt-deserve-bad-rap-in-the-fall/791411.html?utm_source=rss&utm_medium=rss&utm_campaign=goldenrod-doesnt-deserve-bad-rap-in-the-fall

Three tablets treat grass or ragweed allergies, and a fourth gained approval in 2017 for dust mite allergies.

Source: https://www.salon.com/2023/08/15/virtual-clinics-embrace-allergy-drops-as-an-alternative-to-shots_partner/