When it comes to weed allergies, ragweed is the star. Its pollen is one of the most potent. Only a few ragweed pollen grains are needed to produce hay fever, which is bad news considering that one ragweed plant can produce one billion pollen grains in a season.
|TREE POLLEN||LOW||10||Pollen/Cubic meter air|
|WEED POLLEN||MEDIUM||1,045||Pollen/Cubic meter air|
|GRASS POLLEN||MEDIUM||10||Pollen/Cubic meter air|
|MOLD SPORES||LOW||2,433||Mold Spores/Cubic meter air|