here here
Allergies & Pollen

Pollen Forecast for Rockville, Maryland

8.4
Medium-High
Grass, Walnut and Hickory/Pecan
Powered by Pollen
Today
The quantity of pollen grains in the air for Saturday will remain relatively stable in the high range. This is a result of stable temperatures. No change doesn't mean no pollen, it just means that pollen producing plants are delivering pollen at a steady pace.
Outlook
The amount of pollen in the air for Sunday will be falling but will remain in the high range. This lowering of pollen concentrations is a result of rising humidity.