The Science Behind the Intensified Allergy Season

Warm weather has caused an explosion of pollen levels this spring, causing allergies to worsen in some parts of the US. Oak trees in the Southeast are contributing to record-high levels of pollen early in the season. Invasive plants such as Dalmatian toadflax and Johnsongrass can also trigger allergies and aggravate hay fever. Pollen from weeds, grasses, and trees are the primary sources of pollen that can cause allergies.