Question

Pollens floating in air do not cause any air pollution.

Answer 1

Pollen is very fine powder that comes from trees, grasses, flowers and weeds. Wind and birds carry this pollen from plant to plant to fertilize them. When people who have a pollen allergy inhale the pollen, they get allergy symptoms. People can be allergic to different types of pollen. For instance, some are allergic to pollen from only beech trees; others are allergic to pollen from only certain kinds of grasses.
Hence, Pollens floating in air do cause any air pollution.