How long does pollen stay in the air?
How long does pollen stay in the air? Measurements of pollen in the air during and after spring rainfall has found that bits of pollen can remain airborne for up to 11 hours - presenting a previously unconsidered potential breathing hazard for people with allergies and asthma. Can pollen be in the air? Some plants, including ragweed, grasses, and oak trees, make a fine powder called pollen that's light enough to travel through the air. This is how these plants grow and reproduce themselves. More than 25 million Americans are allergic to pollen. Some people are allergic to tree pollen,...