Trees: High Pollen levels between 91 and 1,500 will likely cause symptoms for many individuals who suffer from allergies to the predominant pollen types of the season.

Grass: Low Pollen levels between 0 and 5 tend to affect very few individuals among the allergy-suffering public.

Weeds: Low Pollen levels between 0 and 10 tend to affect very few individuals among the allergy-suffering public.