Allergists in the Northeast are warning of a so-called "pollen vortex" this spring that's expected to hit allergy sufferers really hard.  Exceptionally high pollen levels could make things uncomfortable for people living in any part of the U.S. that was plagued by bitterly cold temperatures during this past winter's polar vortex.

The American Academy of Allergy and Asthma suggests keeping windows closed at night and using air conditioning instead.

Those prone to allergies also should stay indoors when pollen counts are high, wear a mask if they have to be outside, and then shower and change clothes.

Other recommendations include drying your laundry in the dryer instead of outside and keeping your car windows closed.