These spiked yellow pollen grains are still contained within the anther of this aster (a daisy-like flower) where they were produced. However, once they are released, they can travel great distances ...

BOSTON - The yellow green dust is all over Massachusetts ... the only pollen causing problems right now. "It's really birch tree pollen, maple and oak trees that are primarily out there ...

Yellow sand inhalation causes symptoms similar to those from pollen allergies, such as sore throats, itchy skin and excess phlegm. Yellow sand can worsen pollen allergies by damaging the mucous ...