(Maine, New Hampshire, Vermont, Massachusetts, Connecticut, Rhode Island, New York, New Jersey, Pennsylvania, Delaware, Maryland, District of Columbia)

Beginning in February and lasting until June, several types of trees in this region produce allergy-causing pollen – particularly birch, maple/box elder, oak, juniper/cedar and pine trees.

From May to late August, grasses pollinate in the area, including orchard, redtop, fescue and timothy. Other allergy-causing grasses in the region include vernal grass and Bermuda grass.

From August to October, weeds such as ragweed, plantain and nettle pollinate in this region. Other weeds that can trigger allergies include the lamb's-quarter, cocklebur, pigweed and Mexican fire bush.