Allergies & Pollen for Castle Rock, Washington
8.2
Medium-High
Top Allergens:
Grass, Walnut, Oak
Discussion
The amount of pollen in the air for Thursday will be falling in the moderate range. The cause for the falling pollen levels is falling temperatures, rising relative humidity and weaker winds.
Allergy Facts
In the northeastern states, 41 different types of grasses are significant sources of potentially allergenic pollen. The grass pollen season begins in May and extends through October with most pollen shed occurring in August.