Travel only in an air-conditioned car if possible. Recirculate the air inside rather than taking in air from outside. Keep windows closed during pollen season. Have the car air conditioner serviced every 6 months, and change the filters. Run the air conditioning 2-3 minutes before entering the car, which dissipates most of the dust and mold accumulated inside the unit.
Pollen grains come from seed bearing plants.
Plants that are pollinated by the wind are important in allergies. Other plants usually do not cause problems because the pollen only travels by insects, not in the air. Pollens are responsible for allergies outside. Some hyphae specialize by reproducing through spores that disperse in water, air, or by insects or animals. Such spores are strong allergens, which when inhaled by an allergic patient may cause significant symptoms.