noun. The study of the sources, dispersion, and effects of airborne biological materials, such as pollen, spores, and microorganisms.

noun. The study of the dispersion of airborne biological materials, as pollen, spores, microorganisms, or viruses.

"For many years, the allergy seasons have been "getting longer and longer ... partly due to global warming," says Estelle Levetin, chairwoman of the aerobiology committee for the American Academy of Allergy, Asthma and Immunology."