Pollens are tiny, granular male cells present in flowers of plants. Some species are self-pollinating wherein pollination takes place in the same flower. In others, pollen has to be transferred from one plant to another for fertilization to take place. This is known as cross-pollination and one of the medium of transportation of pollens is the wind. During spring and summer when the plants flower, they send out the pollens which are dust like – in the air that causes allergy to humans beings.
The actual allergy to pollen is called hay fever, which is caused when pollen is dispersed through the air. In medical terms, it is known as “seasonal allergic rhinitis”.
Plants that produce lighter pollens, travel long distance by air or carried by animals. The severity of allergy depends on the chemical constituent of the pollen (& plant types). Different part of the world has various types of plant species that are responsible for pollen allergies.