A pollen bomb happens when trees and plants release millions of grains of pollen within a short period of time as a result of prolonged dry weather. Although pollen bomb isn’t an official phrase used by meteorologists, it is used to describe very high levels of pollen in the atmosphere that can worsen symptoms for those with hay fever.
This is a companion discussion topic for the original article at https://patient.info/news-and-features/how-to-cope-with-a-pollen-bomb-during-a-heatwave