Seasonal allergic rhinitis (SAR) or intermittent allergic rhinitis is a form of nasal inflammation (rhinitis) triggered by exposure to airborne pollen particles during the spring and fall seasons. The spring allergy season in the Delaware Valley correlates with airborne levels of tree and grass pollen. It usually begins in mid-March, peaks in late April and early May and ends in early June. Spring allergies have also been known as rose fever. The fall allergy season in the Delaware Valley correlates with airborne levels of weed (particularly ragweed) pollen. It usually begins in mid-August, peaks in late August and early September and ends in late October.
