Very High Pollen in St. Louis, MO

About pollen in St. Louis

Weed pollen dominates today, reaching a very high level that is likely to cause noticeable discomfort for anyone with sensitivities. Tree and grass pollen, by contrast, remain quiet, so most of the day's irritation will trace back to weeds rather than any other source. Over the next few days, weed pollen is expected to ease somewhat before climbing again toward the end of the stretch, so sensitive individuals should still expect some rough patches even as conditions fluctuate. Grass pollen should stay low and fairly steady, while tree pollen remains minimal, which is typical for this point in the season. Late September into fall is prime time for ragweed and other weeds in the St. Louis area, while trees like maple, elm, and honeylocust are well past their active pollen periods and won't be significant contributors again until spring.

What to do today

• Avoid mowing the lawn and raking leaves.
• When driving the car, close your windows and turn the air conditioning system to recirculation mode.
• Keep your windows closed and turn on your air purifier or air conditioning.
• Consider staying indoors during the peak pollen hours (morning and early afternoon).
• Make sure to use an air purifier with HEPA filter in your home, especially in your bedroom. Don't forget to perform regular filter maintenance checks.

Tree map

Every dot is a tree near St. Louis, colored by how allergenic it is. Click one for its details, and zoom in for a closer look.

Top tree-pollen sources

The local tree genera behind today's pollen near St. Louis. Each bar is that genus's share of the tree pollen.

Meet the trees near you

Get to know the tree types growing around St. Louis: what each looks like, how allergenic it is, and when it blooms.

Red maple

Acer rubrum

Allergenicity 3/4Blooms spring

Green ash

Fraxinus pennsylvanica

Allergenicity 4/4Blooms spring

Callery pear

Pyrus calleryana

Allergenicity 1/4Blooms spring

Pin oak

Quercus palustris

Allergenicity 4/4Blooms spring

Littleleaf linden

Tilia cordata

Allergenicity 2/4Blooms summer

Sugar maple

Acer saccharum

Allergenicity 3/4Blooms spring

Freeman maple

Acer freemanii

Allergenicity 3/4Blooms spring

Silver maple

Acer saccharinum

Allergenicity 3/4Blooms spring

White ash

Fraxinus americana

Allergenicity 4/4Blooms spring

American sycamore

Platanus occidentalis

Allergenicity 4/4Blooms spring

Thornless honeylocust

Gleditsia triacanthos

Allergenicity 2/4Blooms spring

London planetree

Platanus acerifolia

Allergenicity 4/4Blooms spring

Cherry/plum

Prunus

Allergenicity 1/4Blooms spring

Sweetgum

Liquidambar styraciflua

Allergenicity 2/4Blooms spring

Hybrid elm

Ulmus

Allergenicity 3/4Blooms spring

Ginkgo

Ginkgo biloba

Allergenicity 1/4Blooms spring

Common questions

What is the pollen count in St. Louis, MO today?

St. Louis, MO is at a very high 5 out of 5 on the Universal Pollen Index today, driven mainly by weed pollen. Over the next five days it ranges from 2 to 5 of 5.

Is weed pollen high in St. Louis, MO right now?

Weed pollen is very high today at 5 of 5, and it's in season now. Most allergy sufferers will have symptoms.

What plants are causing allergies in St. Louis, MO?

The main sources right now are Carpinus, Honeylocust, Elm, Maple, and Pine. Ragweed (Asteraceae (the daisy family), Late summer, fall) is actively pollinating.