Table 2: Most common aeroallergens by age group.

2-3-year-old childrenPollenPositive percent of
16 children

Most common weedsRussian thistle60%
Pigweed58%

Most common grassesTimothy45%
Alfalfa56%
Brome40%
Johnson40%

Most common treesWalnut75%
Olive55%
Mountain cedar50%
Willow50%
Sweet gum33%
Mulberry43%
Pine25%

4-5-year-old childrenPollenPositive percent of
51 children

Most common weedsRussian thistle54%
Pigweed46%
Sagebrush43%

Most common grassesTimothy42%
Johnson44%
Alfalfa37%

Most common treesOlive42%
Maple39%
Willow31%
Sweet gum23%
Mulberry29%
Pine19%

6-7-year-old childrenPollenPositive percent of
56 children

Most common weedsRussian thistle68%
Pigweed61%
Sagebrush49%

Most common grassesSaltgrass58%
Timothy48%
Bermuda45%
Johnson45%

Most common treesWillow39%
Sweet gum32%
Mulberry36%