pollen in microscopePollen, a fine to coarse powder from plants (seed) can cause allergy for some people. Generally in pollen season, there are some preventive actions for those who has allergy to pollen. These are some preventive actions to keep you from allergy: Keeping the windows and doors closed Using outdoor air filter Clean your room from pollen by using vacuum cleaner or duster. Use allergy bedding to help you out from allergy.